PHYSICS

 

                      PHYSICS

1.     Solar eclipse occurs when

a)     Earth comes between sun and moon

b)    Moon is at right angle to the earth

c)     Moon comes between sun and earth

d)    Sun comes between moon and earth

             Ans: c

2.     When a man circles round the earth in a satellite, then

a)     His mass becomes zero but weight remains constant

b)    Mass remains constant but weight becomes zero

c)     Both mass and weight remains constant

d)    Both mass and weight remain zero

Ans: b

3.     The weight of an object at the poles is greater than at the equator. This is because

a)     Of the shape of the earth

b)    The attraction of the moon is maximum at the earth’s surface

c)     The attraction of the earth is maximum at the moon’s surface

d)    Gravitational pull is more at the poles

Ans: b

4.     The water in an open pond remains cool even in hot summer because

a)     Of continuous evaporation of water

b)    Water radiates heat more rapidly than the atmosphere

c)     Water absorbs heat less rapidly than the atmosphere

d)    Water absorbs heat more rapidly than the atmosphere

Ans: c

5.     You are travelling in a car and a thunder storm suddenly takes place. What will be your first step?

a)     Stop the car, get out of it and lie flat in the field

b)    Stand below a tree

c)     Go to a nearby wooden pole and stick to it

d)    Lie flat in the car

Ans: d

6.     In high mountain regions bleeding through nose occurs because

a)     The pressure of blood capillaries is higher than the outside pressure

b)    The pressure at high altitudes is greater than that in the plains

c)     The blood pressure increases at high altitudes

d)    The blood pressure decreases at high altitudes

Ans: a

7.     When light enters a closed room through a small hole in the door, the image of an outside building appears inverted on the opposite wall. This is because

a)     The hole acts as a convex lens

b)    Light takes curvature at the edges of the hole

c)     Of rectilinear propagation of light

d)    The hole acts as a concave lens

Ans: b

8.     An ordinary clock loses time in summer. This is because

a)     The length of the pendulum increases and time period decreases

b)    The length of the pendulum increases and time period decreases

c)     The length of the pendulum decreases and time period increases

d)    The length of the pendulum decreases and time period increases

Ans: a

9.     A ball bounces at high altitudes than in plains. This is because

a)     The pressure on higher altitudes is lower than in plains

b)    Downward pull due to gravity is lesser at higher altitudes

c)     The rarefied air offers less air resistance to the ball

d)    You become more energetic at hills, so greater force applied, higher goes the ball

Ans: a

10.       The minor planets revolving between the orbits of mars and Jupiter are called

a)     Asteroids

b)    Comets

c)     Meteors

d)    Novas

Ans: a

11.        The range of television broadcasting is confirmed to a limited distance because

a)     Long waves are used

b)    Short waves are absorbed by atmosphere

c)     Energy of the waves is dissipated

d)    Earth is spherical in shape

Ans: d

12.          Unit of distance used in navigation is

a)     Nautical mile

b)    Kilometer

c)     Light year

d)    Yard

Ans: a

13.        What type of mirror is used by motorists to see the road behind them?

a)     Convex

b)    Concave

c)     Plane

d)    Concave-convex

Ans: a

14.       The escape velocity from the earth’s surface is about

a)     30km/sec

b)    6km/sec

c)     11.2km/sec

d)    300km/sec

Ans: c

15.       The radiant energy of the sun is due to

a)     Nuclear fission

b)    Nuclear fusion

c)     Sinking of the sun

d)    Violent explosions

Ans: b

16.       In microphone, transformation of energy takes place from

a)     Sound into electrical energy

b)    Electrical into sound energy

c)     Sound into mechanical energy

d)    Mechanical into sound energy

Ans : a                                                                             

17.       Fuel used in a nucler reactor is

a)     Uranium

b)    Heavy water

c)     Barium

d)    Cadmium

Ans : a

       18 .Neil Armstrong was the frist person to reach on the moon . While on the moon

a)     His  mass remained the same but weight increased

b)    His  mass remained the same but weight decreased

c)     His mass as well as weigth decreased

d)    His mass increased but weight remained the same

Ans : b

        19 . Distance of stars is measured in

a)     Light years

b)    Kilometres per second

c)     Kilometres only

d)    Nautical miles

Ans : a              

20 .  Isotopes of the same element differ in thr number of

a)     Pratons

b)    Neutroms

c)     Electroms

d)    Positrons

Ans : b

21. Stainless steel contains which of the following?

a)     Aluminimu and zinc

b)    Chromium and carbon

c)     Zinc and mercury

d)    Copper and Cadmium

Ans: b

22. Radar is used for

a)     Detecing objects by using light waves

b)    Reflecting sound waves to detect objects

c)     Determining the presence and location of objects

d)    Tracking rain – bearing clouds

Ans: c

23. In a hydraulic as shown in the figure how much weight should be put on the piston A to balance the level of water when a weight of 40gm is put on the piston B?

a)     10 G

b)    5 G

c)     20 G

d)    40 G

ANs: c

 25. To an astronaut in the space crafter her sky pour appears to be

a)     Blue

b)    White

c)     Black

d)    Orange red

Ans: c

 27. On the above scale, the average body temperature 98. 4

 F will be equivalent to

a)     77

b)    128. 6X

c)     113.3. 4X

d)    154.4X

Ans: c

 28. What are the primary colors?

a)     Blue, green, yelo

b)    Yellow, red, blue

c)     Red, blue, green

d)    Green ,white ,black

Ans: b

 29. If water contracts on freezing, which of the following would happen?

a)     Icebergs completely float on the surface of water

b)    Ice would become more dense

c)     Lakes would freeze from top to bottom

d)    Rocks will crack due to freezing if internal water

Ans: b

 30. When the ice floating in glass of water melts, the level of water will

a)     Increase

b)    Decrease

c)     Remian constant

d)     First increaseas and then decrease

Ans: c

 31. What is the function of a fuse wire?

a)     To prevent an unduly high electric current form passing through a circuit

b)    To increases the current suppy

c)     To decrease the current supply

d)    To stabilize the voltage

Ans: a

 32. Why is advisable not to draw current for many appliances from a single point?

a)     Current will decrease

b)    Current will increase

c)     Current and volatege both will increase

d)    Voltage will decrease whereas current will increase

Ans: d

 33. Why does man weigh more at the poles than at the equator?

a)     Because there is no atmosphere at the poles

b)    Because gravitational pull is more at rhe poles

c)     Because gravitational pull is less at the poles

d)    None of the above

Ans: b

 34. Mark the current answer

a)     Planets have an appartne motion and twinkle

b)    Planets have no apparent motion but twinkle

c)     Planets have an apparent motion but do not twinkle

d)    Planets have no apparent motion and do not twinkle

Ans: c

 35. Why is it easier to cook in a pressure cooker?

a)     High pressure creates turbulence

b)    More steam is formed inside the cooker

c)     Boiling point of water is raised

d)    Boling point of watter is lowered

Ans: c

 36. What happens when the temperature of water falls from 30 and 0

a)     The volume of ice formred will be less than volume of water

b)    The volume of ice formed will be more than the volume of water

       c)  Water willnot freeze at 0

      d) None of the above

Ans: c

 36. What happens when th temperature of water falls from 30 and 0

a)     The volume of ice formed will be less than volume of water

b)    The volume of ice formed will be more than the volume of water

c)     Water will not freeze at 0

d)    None of the above

Ans: b

 37. To an astronaut in the spacecraft, the sky appears to be

a)     Blue

b)    White

c)     Dark

d)    Red

Ans:c

 38. A fan makes a hot noon to feel cool by

a)     Blowing out hot air

b)    Increasing the rate of evaporation

c)     Letting in cool air

d)    Regulating the air flow

Ans: b

 39. When a ship enters a sea from a river, its portion under water will

a)     Increase

b)     Decrease

c)     Show no change

d)    Increase and decrease alternately

Ans: b

 40. Hygrometer is used to measure

a)     Density of liquid

b)    Relative humidity of atmosphere absorption power of planets

c)      Temperature of air

d)    Temperature of air

Ans: a

 41. Kilowatt is the unit of

a)     Voltage

b)    Power

c)     Resistance

d)    Current

Ans: b

 42. The sun derives its energy from

a)     Nuclear fission reactions

b)    Nuclear fusion retina

c)     Oxidation of helium

d)    Fission of noble metals

Ans: b

 44. Electrodes are used in voltaic cells, These’re of:

a)     Zinc and lead

b)    Carbon and zinc

c)     Zinc and cooper

d)    Carbon and nickel

Ans: c

 

 45. What is the differens between an explosion and combustion?

a)     In the former nuclear reaction takes place while in the latter case burining takes place

b)    In the former chemical energy is transformed into nuclear energy while in the latter case the chemical energy is transformed into heat energy

c)     In the former it is violent and rapid reaction with reels of much heat energy shile in the latter case it is generally slow reaction with release of less heat energy

d)    None of the above

Ans: c

 46. Assertion: The same side of the moon is always seen from the earth

Reason: The moon rotates on its axis once in each orbital revaluation

a)     If both A and R are true but R is not the reason for A

b)    If both A nd R are true but R is not the reason for A

c)     If neithrer A nor R is correct

d)    If A is correct but R is wrong

Ans : b

 47. “Mach Number” is a term associated with the sped of

a)     Ships

b)    Cras

c)      Aeroplanes

d)    Light

Ans: c

 48. Why do we feel chill having a dip in sea water?

a)     The differnet in temperature between sea water and the atmosphere

b)    Eva[pporation of water from the body

c)     Deposion of slat on the body

d)    None of these

Ans: b

 49. The surface of the water in Alake is frozen and its temperature is - 15mum possible temperature of the water inside the lake in contact with the layer will be

a)     0

b)    4

c)     15

d)    Insufficient data to predict

Ans: b

 50. A stone is tied to a rope and attached tot a wooden bar which rotates at constant angular velocity. Suddenly the bar is stopped. The stone gets encircled around the bar. What happens to the angular velocity of the stone?

a)     Increase

b)    Decreases

c)     Remains the same

d)    First increase and then decreases

Ans: d

 51.  Cover of a solar cooker is made of glass why?

a)     It absorbs sun rays

b)    It reflects sun rays

c)     Sun heat transmitted through glass  without sumch absorption

d)    Noe of the these

Ans: a

 52. When a brick is dropped in water, bubbles are seen to rise. This I s due to

a)     Air in the pores of the brick

b)    Air in water

c)     Water displaced by the brick

d)    None of thje these

Ans: c

 

53. Which comet appears after 76 years and likely to appear in 1986?

a)     Halley’s comet

b)    Biela’s comet

c)     Turtle’s comet

d)    None of the these

Ans: a

 54. Assertion: (A) Eclipse do not occur on all full moon

 And new moon days

 Reason ( R) : The moon revolves round the earth in an elliptical orbit

a)     A and R are both are incorrect

b)    A is correct but R is incorrect

c)     A and R are correct and R is the  correct explanation of A

d)    A and R correct but R is not the correctly explanation of A.

Ans: c

 55. A person sitting in a bus experiences a jerk, when the bus stops all of a sudden. This is due to

a) Law of interia

b) Newton’s third law of motion

c) Einstein’s law of relativity

d) None of these

Ans: a

 56 .For pasteurization by the Flash Method, milk is heated to a temperature of

a)      0°C

b)    -4°C

c)     100°C

d)    73°C

Ans: d

 57. A person sitting in a bus experiences a jerk, when the bus stops all of sudden. This is due to

  a) 1986

b) 1988

c) 1989

d) None of the above

Ans: a

 58. Mesons are found in

a) X - rays

b) Cosmic rays

c) Frays

d) None of the  above

Ans: b

59. Study the frequency of the following electromagnetic radiations and select the correct relationship (‘>’ implies greater than):

         I.            Infra- red

       II.            Microwave

      III.            Ultra -violet

Codes:

a)     I > II > III

b)    III > I > II

c)     III > II > I

d)    II > III > I

Ans: b

 60. Given :

Humidity - H                  High - A

Wind velocity - W       Low -B

Temperature -T

The desert cooler is an appropriate cooling devise for fregions where

a)     H -A, W -A, T -B

b)    H -B, W - B, T -A

c)     H -A, W - B, T -B

d)    H -A, W -A, T -A

Ans: b

 61. Black hole is

a)     A magnetic dark cavity

b)    Name of a star

c)     A hole in the moon

d)    A dyng star

Ans: d

 62. Ball - bearings are used to reduce the friction by

a)     A magnetic dark cavity

b)    Name of star

c)     A hole in the moon

d)    A dying star

Ans: a

 63. Microphone is a device in which the

a)     Ound waves are converted into electrical energy and hen reconverted in to sound after transmission

b)    Sound waves are diredclyt transmitted

c)     Electrical energy is converted into sound wave sdirectly

d)    Amplification isnot required at all

Ans: a

 64. Ice cubes are floating in a glass of water, when the ice cubes melt, the water level in the glass

a)     Will firstf increase and then start decreassin

b)    Will first decrease nd then start increasing

c)     Will remain unchanged

d)    Will increase

Ans: c

 65. Which of the following pairs is not correct?

a)     Seismograph - Earthquakes

b)    Anemometer - Speed of the wind

c)     Hygrometer - Water vapor content of the atmosphere

d)    Lactometer - Specific gravity of liquids

Ans: d

 66. Radio waves travel with a speed of

a)      3 X m/sec

b)    3 X  m/sec

c)     3 X  m /sec

d)    3 X  m /sec

Ans: c

 67. If the distance that a radio wave can travel in the time of one complete cycle is 10 meters, then the frequency of the radio wave in cycles per second is

a)       3 X m/sec

b)    3 X  m/sec

c)     3 X  m /sec

d)    3 X  m /sec

Ans: d

 68. The center of gravity of the floating ship

a)     Lies above the metacenter

b)    Lies below the metacenter

c)     Coincides with the metacenter

d)    None of th e above

Ans: a

 69. Atmospheric temperature increases t the higher altitudes due to

a)     Convection

b)    Radiation

c)     Conduction

d)    Inversion

Ans: d

 70. A small wooden block is floating in abut of water, the water is gradually heated. The volume of the wooden block visible above the water level

a)     Increase

b)     Decrease

c)      Fluctuates

d)    Remain the same

Ans: b

 71. If a toy boat in a tank sinks, the level of water will

a)     Increase

b)     Decrease

c)      Fluctuate

d)    Remain the same

Ans: a

 

 72.  Black hole

a)     Does not emit any radiations

b)    Coverts UV /radiations to infra - recti radiations

c)     Absorbs all the radios that fall on it

d)    Is an imaginary concept in physics

Ans: c

 73. Which of the following is the correct sequence in order of increasing power consumption?

a)     Television, Fan, Electric  Iron

b)    Televisions, Fan Electric Iron

c)     Fan, Television, Electric Kettle Electric Iron

d)    Fan, Televion, electric Iron. Electric kettle

Ans: d

 74. To increase the voltage of alternative current, we can use

a)     Capacitor

b)    Transformer

c)     Inverter

d)    Rectifler

Ans: b

 75. Assertion: Solar eclipse occurs on a new moon day.

Reason: Moon is in conjunction with the sun.

a)     If A and R both are correct but R is not the correct explanations of A

b)    If A ad R both are correct but R is not the correct explanation of A

c)     If A is correct and r is incorrect

d)    If A is incorrect and R is correct

Ans: a

 

 76.  Assertion: comets have gaseous tails.

Reason: They are very hot bodies..

a)     if A and R both are correct but R is not the correct explanations of A

b)    if A and R both are correct but R is not the correct explanation of A

c)     if A is correct and r is incorrect

d)    if A is incorrect and R is correct

Ans: c

 77. Which of the following groups of instruments is required to have communication line between two televise really centers?

a)     Microwave link, telephone, booster relay, satellite

b)    Radio telescope, microwave link, booster realy, telephone

c)     Microwave link, booster really satellite

d)    None of the above

Ans: d

 78. Ozone layer of atmosphere absorbs

a)     Ultraviolet rays

b)    Infrared rays

c)     All radiations of light

d)    Cosmic rays

Ans: a

 79. The fuel used in Fast Test Reactor at kalpakkam is

a)     Enriched Uranium

b)    Thronium

c)     Plutonium

d)    None of the above

Ans: c

 

 

 80. Which of the following is a conventional source of energy?

a)     Geothermal

b)    Hydropower

c)     Solar

d)    Wind

Ans: b

 81. Acceleration due to gravity on moon is 0. 166 times than that on the earth. A man weighing 60 Kg on earth would weigh -----kg on moon.

a)     16.6kg

b)    30kg

c)     60 kg

d)    10 kg

Ans: a

 83. A man coming down on a lift leaves a ball from his hand. The ball will

a)     Go up

b)    Fall down

c)     Remain stationary With respect to man

d)     Oscillate  up and down

Ans: c

 84. The stars receive their energy from which of the following?

a)     Chemical reaction

b)    Nuclear fuion

c)     Remian stationary with respect to man

d)    Gravitational pull Reading of the barometer going

Ans: c

85.  Reading of the barometer going down is an indications of

a)     Storm

b)    Rainfall

c)     Snow

d)    Intense heat

Ans: a

 86. Which of the following is used in diesel engine?

1) Cylinder

2) Spark plug

3) Piston

Codes:

a)     1, 2 and  3

b)    1 and 2

c)     2 and 3

d)     1 and 3

Ans: d

 87. Distribution of electric power form one place to another is done at high A.C voltage because

a)     Watage of electricity is minimized

b)    Staling of electric wires is preovented

c)     Electricity spreads in very short time

d)    It adds brightness

Ans: a

 89. An astronaut weighing 100kg fires a bullet weight 1 kg with a gun of 10 kg at the speed of 50 meters/ second. What will be the recoil velocity of the gun?

a)     5 m/s

b)    50 cm/s

c)     0.5 cm/s

d)    0.05 cm/s

Ans: d

90. To a person on the moon, the sky appears

a)     White

b)    Black

c)     Blue

d)    Orange

Ans: b

 91. Neutron was discovered by

a)     Ouo Hahn

b)    Enrico Fermi

c)     Lise Meitner

d)    James Chad wick

Ans: d

 92. Let E-1, E_2, E_3 denote efficiency of a diesel, a petrol and a steam engine respectively. Which of the following is correct?

a)     E_2,> e_1, E_3

b)    E_3 <E_2 < E_1

c)     E_1, E_2 > E_3

d)    E_3, < E_1 < E_2

Ans: c

 93. The resolving power of an electron microscope much higher than that of an ordinary light microscope because resolving power increases

a)     If wavelength is short wavelength of electric beam can be made quite small by accelerating the electrons.

b)    If wavelength is short and light given by electrons has very short wavelength.

c)     If magnification is high and electric lens provides much higher magnification

d)    If magnification high and the electron microscope has battery of lenses to provide high magnification.

Ans: b

 94. The Sri Lnaks Broadcasting Corporation broadcasts its programmers on the 25 metreband, Which one of the following is the frequency of this transmission?

a)     12 kilo Hertz

b)    1.2 kilo Hertz

c)     12 Mega Hertz

d)    120 Mega Hertz

Ans: c

 95. If camera A has f 4.5 lens and camera B has f 2.8 lens, and the diametrs of both the lenses are equal. Then

a)     Pictures taken by A will always be sharper

b)    Pictures taken by A will always be sharper

c)     A is better for photographing fast moving objects.

d)    B is better for photographing fast moving objects

Ans: b

 96. Seawater is saltier than rain water because

a)     Sea beds have salt producing mines

b)    Rivers wash away slats from the earth and pour them into sea.

c)     The air around sea is sailfish

d)    Sea animals are salt producing.

Ans: b

 97. A free - floating astronaut ‘A’ pushers another free - floating astound ‘B’ in a space. The mass of ‘A’ is greater than that of ‘B’ The force exerted by the astronaut ‘A’ on the astronaut ‘B’ will be

a)     Equal to zero

b)    Equal to the force exerted by ‘B’ on ‘A’

c)     Greater than the force exerted by ‘B’ on ‘A’

d)    Less than the force exerted by ‘B’ on ‘A’

Ans: c

 98. On the Moon, estrous inflate a rubber balloon with hydrogen gas and release it at a height of 2 meters. The balloon will

a)     Fall down

b)    Go upwards

c)     Remain at the hiegth of 2 metres

d)    First go up and finally come down

Ans: d

 99. The phenomenon of mirage is due to

a)     Increased absorption of light by air at higher tempertaue

b)    Change in the refreative index of air with the change in temperature

c)     Total internal reflecton

d)    Decreased absorpiotn of light by air at higher temperature

Ans: c

100. The limit beyond which stars suffer internal collapse is called

a)     Chandrashekar limit

b)    Eddington limit

c)     Hoyle limit

d)    Folwer limit

Ans: b

101.A boat filled some stones is floating in water. If the stones are dropped into the water, the level of the water will

a)     Rise

b)    Decreases

c)     Remian the same

d)    Insuffcient dta to predict

Ans: c

 102. Total internal reflection occurs when light travels from

a)     A rare medium to adenser medium

b)    A denser medium t o ararer medium

c)     A rarer medium is less than the critical angle. Angle of incidenece is less than the crital angle

d)    A rarer ,edium to a denser medium and the angle of increases is greater than the critical angle.

Ans: b

 103. A chair is tittled about two of is legs and then left. It would return to its original position if

a)     Its centre of gavity falls outside the base

b)    Its centre of gravity falls within the base

c)     It is titled through an angle of 60

d)    None of the above

Ans: b

 104. Very small - time intervals are accurately measured by the

a)     Pulsars

b)    White dwarfs

c)     Atomic clocks

d)    Quartz clocks

Ans: c

 105. Insolation refers to

a)     Restraining the flow of electric current

b)    Restraning the flow of water

c)     Exposure to the rays os sun

d)    Exposure to the light

Ans: c

 106. Which of the following is true?

a)     Sound waves exhibit interference

b)    Light waves exhibit interference

c)     Both the light and asound waves exhibit interference

d)    Neither sound waves nor light waves exhibit interference.

Ans: c

 107. Heat from the sun received by the earth through

a)     Conduction

b)    Convection

c)     Radiation

d)    None of the above

Ans: c

 108. ‘Blackholes’ refers to

a)     Holes occurring in heavenly bodies

b)    Bright spots on the sun

c)     Collapsing object of high density

d)    Collapsing object of low density

Ans: c

109. Atmospheric pressure exerted on earth is due to the

a)     Rotation of earth

b)    Reveloution of earth

c)     Gravitational pull

d)    Uneven heaing of earth

Ans: c

 110. A small weight put on the pressure cooker increase the pressure of steam because

a)     It is aaaaaaair tight

b)    Area of contact is very small

c)     Density of metal is very high

d)    Pressure builds up irrespective of the weight placed

Ans: d

 

111. Birds get thrust (forward motion ) and lift (upward motion) from the

a)     Flapping of wings

b)    Twisting of feathers

c)     Shape of wimgs which is similar to aeroplan blads

d)    Air sac

Ans: a

 112. The conversations of electrical into chemical energy is observed in

a)     Fan Incandescent effect

b)    Photoeletrci effect

c)     Satk effect

d)    Zwwman effect

Ans: d

 113. The evidence for the rotation of stars comes mainly from the

a)     Dopper effect

b)    Photoelectric effect

c)     Stark effect

d)    Zeeman effect

Ans: a

 114. Assertion : (A): A tennis ball will bounce higher in Calcutta than it would in Shimla.

Reason ( R)  The downward pull due to gravity is less and air is more rarefied in Calcutta than ie would in Shimla than in Calcutta.

a)     Both A and R are true and R is the correct explanation of A

b)    Both A and R are true nut R is not a correct explanation of A

c)     A is true but R is false

d)    A is false but R is true

Ans: d

 

115. Aeration (A): When a ship moves from the sea water into fresh water of a river, this hip will relatively sink

Reason ( R): The density of sea water is higher in Calcutta than it would in Shimla.

 Calcutta than ie would in Shimla than in Calcutta.

     a) Both A and R are true and R is the correct explanation of A

b) Both A and R are true nut R is not a correct explanation of A

c) A is true but R is false

d) A is false but R is true

Ans: a

116. Assertion: (A): When a wheel is in motion, appoint (on the rim) which is farthest away from the  ground will have the highest speed while have the lowest  speed.

Reason ( R)  The speed of the point on the  rim in the direction of motion and along the circumference of the wheel are additive.

a)     Both A and R are true and R is the correct explanation of A

b)    Both A and R are true nut R is not a correct explanation of A

c)     A is true but R is false

d)    A is false but R is true

Ans: a

 117. Given below are colors of the visible spectrum Identify the correct sequence in order of increasing wavelengths:

a)     Red, Yellow, Blue, Violet

b)    Violet, Yllow, Blue, Red

c)     Blue, Yellow, Red, Volet

d)    Violet, Blue, Yellow, Red

Ans: d

 

 

 118. Photons have properties similar to that or

a)     Waves

b)    Particles

c)     Both particles and waves

d)    Neither particles nor waves

Ans: c

 119. Assume that --

A - Denotes narrow wheel with wider wheel

B _ denotes small free wheel with large wheel

C- Denotes gear wheel with large wider wheel

In a rural area where there are sandy tracts, it will be advisable to use a bicycle with

a)     A

b)    B

c)     C

d)    Al of these

Ans: c

 120.  A passing motorcycle causes distortion or disturbance with reception of signal in radio and T.V The cause of this is

a)     The intense sound waves affect the small electronic devices of the receptor

b)    The vehicle’s metal parts block/distort the radio waves

c)     The spark plug fitted in the engine produces electro- magnetic signals due to sparking

d)    Modern motor- cycles are fitted with electric ignition system which produces radio waves

Ans: c

 

 

121. The path of Halley’s Comet in its orbit around the sun is

a) Parabolic

b) Hyperbolic

c) Elliptical

d) Circular

 Ans: c

122. An instrument measures the voltage of 50 Hz sinusoidal current as 220 V. The mean average voltage of the sinusoidal current is

a)     Zero

b)    4.4V

c)     220 V

d)    220/ under root 2

Ans: b

 123. Super conductors are so called because they

a)     Efficiently conduct heat from one hot body to another

b)    Offer no resistance to seduction of heat at high temperatures

c)     Offers no resistance to condition of electricity at low temperatures

d)    Produce high temperatures while conducting electricity

Ans: c

 125. Weight of two pieces, one of gold and one of silver each weighing 100 gm were recorded on a spring balance. Then they hang trhougha light thread tied to the balance. Compare the recorded weights of the two pieces under that condition. Then

a)     The gold piece will weigh than the silver piece

b)    The silver piece will weigh more than the gold piece

c)     The weights of the two pieces will be equal

d)    Nothing can be said without knwing the density of the liquid density

Ans: b

 

126. A cubic meter of water at 0 C is solidified into ice. Density of ice is 0.96 of water at 0 C which of the following educations are true?

1) Water expands when solidified.

2) Ice will float in water at 0 C with half its volume above the surface.

3) Density of all liquids are higher than its density when solidified

Select the correct answer from the codes given below:

a) 1 only

b) 2 only

c) 3 only

d) 1 and 2

 Ans: d

127. The rainbow and the rainbow - like colors seen on a thin film of oil on a water surface are two phenomena. They are

a)     Similar in nature and both are due to refraction of light

b)    Different in nature and rain ow is due to interference of light, while color of htin film is due to diffraction

c)     Similar in nature and both are due to interference of light

d)    Differ net in nature and rainbow is due to refraction, while color of thin film is due to interference of light

Ans: d

 128. A wooden block is floating in water. If 4/5 of its volume is immersed in water and volume of the water displaced is 800 ml, the volume of the bock is

a)     1140 ml

b)    200ml

c)     800 ml

d)    1000 ml

Ans: d

 

 

 129. What is the increasing order of the wavelengths of the following colors?

1. Orrange

2. Indigo

3. Yellow

4. Violet

 Select the correct answer using the codes given below:

a)     1, 2, 3 and 4

b)    3, 1, 4 and  2

c)     1, 3, 2 and 4

d)    4, 2, 3 and 1

Ans: d

 130.  Macth list I with List II and select the correct answer by using the codes given below the lists:

               List I             : List II

A.    Barometer    : 1. Used for measuring altitudes and angles in navigation and               astronomy

B.     Chronometer  : 2. Used for distances between two digits

C.     Sextant           : 3. Keeps very accurate times as the one that is used to determine longitude at sea

D.    Quadrant       : 4. Used for measuring atmospheric pressure

                             : 5. An instrument used in the diagnosis of pregnancy

 Select the correct answer using the codes given below:

                        A    B   C    D

a)     2    3    5    4

b)    4   2     5    1

c)     1    4    2    3

d)    4    3    2    1

Ans: d

 132. Which one of the following take places when a watch based on oscillating spring is taken to a deep mine?

a)      It will beocem slow

b)    It will become fast

c)     It will indicate the same time as on earth

d)    It will stop working

Ans: b

 133. A body is attached to a spring balance suspended from a stand. The reading on the balance is 0.5 kg.The two together are detached from the stand and allowed to fall through a height, while falling the reading in the balance will be

a)     Zero

b)    Less than 0.5 kg but not zero

c)     More than 0.5 kg depending on the height

d)    0.5 kg

Ans: c

 134. When there is depletion of ozone in the stratosphere, the wavelength of radiation staking the earth’s surface will be

a)     10 - 7 m

b)    10 -100 m

c)     10 - 38 m

d)     100 m

Ans: c

 135. The working of quartz crystal in the watch is based on the

a)     Photolelctric Effect

b)    Johnson Effect

c)     Piezo 0- electric Effect

d)    Edison Effect

Ans: c

 137. Which one of the following is NOT an astronomical object?

a)     Pulsar

b)    Brittle star

c)     Black hole

d)    Quasar

Ans: b

 138. The formation of brilliant colors in soap film is a consequence of the phenomenon of

a)     Multiple reflection and interference

b)    Emultiple refrection and dispersion

c)     Diffraction and dispersion

d)    Polarization and interference

Ans: a

 139. At what temperature re the readings of a Centigrade and Fahren heit thermometer the same?

a)      - 40

b)    212

c)     40

d)    100

Ans: a

 140. The pitch of the voice of women is in general

a)     Marginally lower than that of men

b)    Higher than that of men

c)     Much lower than that of men

d)    The same as that of men

Ans: b

 

 

 142. In an electronic which, the component corresponding to pendulum of a pendulum clock is a

a)     Transitor

b)    Crystal oscillator

c)     Diode

d)    Balance wheel

Ans: d

 143. A man jumped at a speed of 5 meters per second from stationary boat and the boat moved off with the speed of 0. 5 meter per second. How many times is the mass of the boat greater than that of the man?

a)     5.5 times

b)    4.5 times

c)     2.5 times

d)    10 times

Ans: d

 144. One mole of hydrogen gas burns in excess of oxygen to give 290 kJ of heat. What is the amount of heat produced when 4g of hydrogen gas is burnt under the same condition?

a)     145 kj

b)    290 kj

c)     580 kj

d)    1160 kj

Ans: d

 145. If a gas is comparessed to half of its original volume at 27 C, to what temperature should it be heated to make it curry its original volume?

a)      327

b)    600

c)     54

d)    300

Ans: c

 146. Which of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure?

a)     F- 22, 1/60

b)    F- 16,1/125

c)     F-8 1/250

d)    F- 5.6, 1/1000

Ans: b

 147. A corked bottle full of water when frozen will break because

a)     the bottle contracts on freezing

b)    the volume of water decreasing  on freezing

c)     the volume of water increases on freezing

d)    glass is bad conductor of heat

Ans:  c

 148. The half -life of a radioactive elemnt is 5 years. The fraction of the radioactive substance that remains after 20years is

a)     ½

b)    ¼

c)     1/8

d)    1/16

Ans: b

 149. The speed of light will be minimum while passing through

a)     Glass

b)     Vacuum

c)     Water

d)    Air

Ans: a

 

150. The acceleration due to gravity of a catastrophic earthquake will be

a)     550 cm/sec^2

b)    750 cm/sec^2

c)     950 cm/sc^2

d)    980 cm/sec^2

Ans: d

 151. The colour of a star is an indication of its

a)     Distance from the sun

b)    Luminosity

c)     Distance form the earth

d)    Temperature

Ans: d

 152. The colour of an opaque object is due to the color it

a)     Absobs

b)    Refracts

c)     Reflects

d)    Scatters

Ans: c

 153. A meter is

a)     A rapidly moving star

b)    A piece of matter which has enterd the earth’s atmosphere from puter space

c)     Part of a constellation

d)    A comet whithout a tail

Ans: c

 154. The technique used to transmit audio signals in television brodcasts is

a)     Amplitude Modulation

b)    Frequency Modulation

c)     Pulse Code Modulation

d)    Time Diviosn Multiplexing

Ans: d

 156. Which one of the the following can be used to confirm whether drinking water contains a gamma emitting isotope or not?

a)     Pitch, loudness and quality

b)    Pitch and loudness

c)      Quality only

d)    Loudness only

Ans: c

 157. When the same note is played on a sitar and flute, the sound produced can be distinguished from each other because of the difference in

a)     Pitch, loudness and quality

b)    Pitch and loudness

c)     Quality only

d)    Loudness only

Ans: c

 158. Assertion ( A) : A diamond sparkles more than a glass imitation cut to the same shape.

Reason ® : The refreactive index of diamond is less than that of glass.

In the context of the above two statemnts, which one of the following is correct?

a)     Both A and R are true, and R is correct explanation of A

b)    Both A and R are true, but R is the correct expalantion of A

c)     A is true, but R is false

d)    A is false, but R is true

Ans: c

 

 

 159. Who among the following anticipated Newton by declaring that all things gravitate to the earth?

a)     Arybhata

b)    Varhamihira

c)     Buddhagupta

d)    Brahmmagupta

Ans: d

 160. Optical fiber works on the principle of

a)     Total internal refelction

b)    Refraction

c)     Scattering

d)    Interference

Ans: a

 161. Suppose a rocket ship is receding from the earth at a speed of 2/10 the velocity of light. A light in the rock ship appears blue to the passengers the ship.

What colour would it appear to an observer on the earth?

a)     Blue

b)    Orange

c)     Yellow

d)    Yellow - orange

Ans: d

1Convex mirror

Convex lens

163. The difference between a nuclear reactor and an atomic bomb is that

a)     No chain reaction takes places in nuclear reactor while in the atomic there is a chain reaction

b)    The chain reaction in nuclear reator is controlled

c)     The chain reaction in nuclear reactor is not controlled

d)    No chain reaction takes places in atomic bomb while it takes places in nuclear reactore

Ans: b

 164. An air bubble in water act like a

a)     convex mirror

b)    Convex lens

c)     Concave mirror

d)    Concave lens

Ans: d

 166. When an air bubble at the bottom of a rises to the top, it will

a)     Increeasea in size

b)    Decrease in size

c)     Mainatain its size

d)    Flatten into a disk shape

Ans: a

 167. When a mirror is rotated by an angle of , the reflected ray will rotate by

a)    

b)   

c)    

d)    2

Ans: d

 168. A truck, a car and a motor cycle have equal kinetic energies. Their stopping time will be:

a)     X > y > z

b)    X < y <z

c)     X + y =Z

d)    X =4y =8Z

Ans: c

 171. travel internal reflection can take place when light travels from

a)     Diamond to glass

b)    Water to glass

c)     Air to water

d)    Air to glass

Ans: a

 172. Assertion (A); Transformer is usefull stepping or stepping down voltages

Reason ( R): Transformer is a devise used in  D>C circuits.

In the context of the above two statements, which one of the following is correct?

a)     Both A and R are true and R is the correct one of the following is correct?

b)    Both A and R are true but R is not a correct explanation of A

c)     A is true but R is false

d)    A is false but R is true.

Ans: c

 173. Domestic electrical wiring is basically a

a)     Series connection

b)    Parallel connection

c)     Combination of series and parallel connections connection

d)    Series connection within each room and parallel connaeiton elsewhere

Ans: b

 174.Conisder the following statemnts

 At the present level of technology available in Inida solar energy can be conveniently used to

a)     Supple hot water for minor irrigation projects

b)    Provide strre lighting

c)      Combination of seires and parallel conncetions

d)    Series conncetion within each room and parallel connection elsewhere

Ans: d

 175. A simple machine helps a person doing

a)     Less work

b)    The same amount of work with lesser force

c)     The samec amount of work

d)    The same amount of work much faster.

Ans: b

 176. ‘Diamond Ring’ is a phenomenon observed

a)     at the stars of a total solar eclipse

b)    at the end of a total solar eclipse

c)     only along the peripheral regions of the totality trial

d)    only in the central regions of the totality trial

Ans: b

 177. Consider the following statements:

 A person in a spaceship located halfway between the earth and the sun will notice that the

1) Sky is jet black.

2) Stars do not twinkle

3) Temperature outside the spaceship is much higher than that on the surface of the earth.

a)     Only 3 is correct

b)     1and 2 are correct

c)     1 and 3 are correct

d)    1, 2 and  3 are correct

Ans: d

 178. The tail of a comet is directed a way from the sun because

a)     As the comet rotates around the sun, the lighter masss of the comet is pushed away due to the centrifugal force alone

b)    As the comet rotates, the lighter mass of the comet is attracted some  star situated in the direction of its tail

c)     The radion emitted by the sun exerts a radial pressure on the comet throwing its tail away from the sun

d)    The tail of the comet always exists in the same orientation

Ans: c

 179. The tendency of a liquid drop to contract and occupy minimum area is due to

a)     Viscosity

b)    Surface tension

c)     Density

d)    Vapour pressure

Ans: b

 180. Which one of the following is a vector quantity?

a)     Momentum

b)    Pressure

c)     Energy

d)    Work

Ans: a

 183. The working principle of a washing machine is

a)     Centrifugation

b)    Dialysis

c)     Reverse osmosis

d)    Diffusion

Ans: a

 184. A girl is swinging on a swing in sitting postions when the same girl stands up, the period of swing will

a) Be shorter

b) Be onger

c) Depend on the height of the girl

d) not change

    Ans: d

185. Which one of the following does a TV remote control unit t perate a TV set?

a)     Light waves

b)    Sound waves

c)     Micro waves

d)    Radio waves

Ans: d

 186. A noise level of 100 decide is would correspond to

a)     Just audible sound

b)    Ordinary conversation

c)     Sound from a noisy street

d)    Noise from a machine - shop

Ans: d

 187. A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its

a)     Very small size

b)    Very large size

c)     Very high density

d)    Very low density

Ans: c

 188. Fluorescent tubes are fitted with a choke. The choke coil

a)     Steps up the line voltage

b)    Steps down the line voltage

c)     Reduce current in the circuit

d)    Chokes low frequency currents

Ans: a

 189. When a CD (compact Disc used in audio and video systems) is seen sunlight, rainbow like colors are seen. This can be explained on the basic of the phenomenon of

a)     Reflection and diffraction

b)    Reflection and transmission

c)     Diffraction and transmission

d)    Refraction, diffraction and transmission

Ans: d

 190. Assertion (A) : A man standing on a completely frictionless surface can propel himself by whistling

Reason (R) : If no external force  acts on a system , its momentum cannot change.

a)     Both A and R are true, and R is the correct explanation of A

b)    Both A and R are true, but R is not a correct explanation of A

c)     A is true, but R is false

d)    A is false, but R is true

Ans: a

 192.  . Assertion (A) :Small glass beads fixed on traffic signals glow brightly when light falls upon  them.

 Reason ( R): Light is totally reflected when the  angle of incidence  exceeds a certain critaical value and  light travelling ina denser medium is reflected back in the same meauim froma rarer medium

a)     Both A and R are true, and R is the correct explanation of A

b)    Both A and R are true, but R is not a correct explanation of A

c)     A is true, but R is false

d)    A is false, but R is true

Ans: d

 193. Which of the folloiwin wether condition indicated by a sudden fall in baremeter reading?

a)     Stromy weather

b)    Calm and dry wether

c)     Cold and dry weather

d)    Hot and sunny Wether

Ans: a

 194. Cloudy nights are warmer compared to  clear clodless nights, because clouds

a)     Prevent cold waves from the sky from descending on Earth

b)    Reflect back heat given off by Erath

c)     Produce heat and radiate it towards Erath

d)    Absorb heat from the atmosphere and send it towards Earth

Ans: b

 195. A eradicative substance has a half - life of four months. Thread - fourth of the substance would decay in

a)     3 months

b)    4 months

c)     8 months

d)    12 months

Ans: c

 197. Consider the following statements: A simple pendulum is set into oscillation. Then

a)     The accelearaiton is zero when the bob passes trhough the mean postions

b)    In each cycle the bon attains a given velocity twice

c)     Both acceleration its extreme posions during its oscillation

d)    The amplitude of oscilation of the simple pendulum decreases with time

Ans: d

 

 200. When light waves pass from air to glass, the variables affected are

a)     Wavelength, frequency and velocity

b)    Velocity and frrequecny

c)     Wavelenth and frequency

d)    Waveelngth and velocity

Ans: d

 201. When water is heated from 0 its volume

a)     Increases

b)    Decreases

c)     Does not change

d)    First decrease and then increase

Ans: d

 202.  Consider the following statements:

1) Ina nuclear reactor, self - substained chain reaction is possible, because more neutrons are released in each of the fission reactions

2) The neutrons immediately take part in the fision process.

3) The fast neutrons are sloed down by Graphite.

4) Every neutrons relased in the fission reaction intitates further fission

Whidh of these statemnts are correct?

a)     1, 2 and  3

b)    1 and 3

c)     2  and  4

d)    2, 3 and  4

Ans: c

204. Complete the following natural phenomena:

1) Terristrial heating

2) Reflection of light

3) Refraction of light

4) Differaction of light

Due to which of these phenomena is mirage formed?

a)     1 and  2

b)    2, 3 and  4

c)      1 and  3

d)     4 only

Ans: c

 205. Sun’s halo is produced the refraction of light in

a)     Water vapour, in Stratus clouds

b)    Ice crystals in Cirro - Cumulus clouds

c)     Ice crystals in Cirrus clouds

d)    Dust particles Stratus clouds

Ans: c

 206. Consider the following statements:

1) Light of ,onger wavelength is scatters much more than the light light of shoter wavelength

2) The speed of visible light water is 0.35 times than speed in vacuum

3) Radio waves are produced by rapidly oscillating electrical currents.

4)  To defect the over speeding vehicles, police use the Doppelr effect of reflected short radio waves

Which of these statements are correct?

a)     1 and 2

b)     1 and 3

c)      2 and 4

d)    3 and 4

207. Assertion (A) : With the increases of temperature, the visocity of glycerin increases.

Reason (R): Rise of temperature increases kinetic energy of molecules.

a)     Both A and R are individually true and R is the correct explanation of A

b)     Both A and R are individually true but R is nor a correct explanation of A

c)     A is true but R is false

d)    A is false but R is true

Ans: d

 208. Assertion (A): An iron ball floats on mercury but gets immersed in water.

 Reason ( R) : The specific gravity of iron is more than that of mercury

a)      Both A and R are individually true and R is the correct explanation of A

b)     Both A and R are individually true but R is nor a correct explanation of A

c)     A is true but R is false

d)    A is false but R is true

Ans: c

 209. Different of light in the atmosphere takes places due to:

a)     Carbon dioxide

b)    Dust particles

c)     Helium

d)    Water vapors

Ans: b

210. An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then.

a)     Carbon dioxide

b)    Dust particles

c)     Helium

d)    Water vapors

Ans: b

 211. If the radius of the earth were to shrink byy one percent, its mass remaining the same, the value of ‘g’ on the earth’s surface would:

a)     Increase by 0.5%

b)    Increase by 2%

c)     Decreases by 0.5%

d)    Decreases by 2%

Ans: b

 212. A hydrogen - inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will:

a)     Decrease in size

b)    Flatten into a disc - like shape

c)     Increases in size

d)    Maintain the same size and shape

Ans:c

 213. Consider the following statements:

1.     Steam at 100C and boiling water at 100Ccontain same amount hf heat.

2.     Latent heat of fusion of ice is equal to the latenet heat of vaporization of water.

3.     In an air -conditioner, heat is extracted from the room - air at the evaporator coils and is rejected out at the condenser coils.

Which of these statements is/are correct?

a)     1 and 2

b)    2 and  3

c)      Only 2

d)    Only 3

Ans: d

 214. Consider the following statements:

A4 - wheel vehicle moving ina sharp circular path at high speed will:

1)    Overturna bout its outer wheels

2)    Overturn about its inner wheels

3)    Skid outwards

4)    Skid inwards

Which of these statements is/are correct?

a)     1 and 3

b)    2 and 4

c)     2 and 3

d)    1 and 4

Ans: c

 215. Which one of the following statements is NOT correct?

a)     The velocity of sound in air  increases with the increases of temperature

b)    The Velocity of wound in air is independent of pressure

c)     The velocity of sound in air decreases as the humidity increases

d)    The velocity of sound in air is not affected by the change in amplitude and frequency

Ans: d

 216. Assertion (A): In our houses, the current in AC electricity

line changes direction 60 times per second

Reason (R) The frequency of alter matting voltage supplied is 60 hertz

ANs: a

 217. A car is running on a road at a uniform speed of 60 km/hr. The net resultant force on the car is:

a)     Driving force in the direction of car’s motion

b)    Resistance force opposite to the direction of car’s motion

c)     An inclined force

d)    Equal to zero

Ans: d

 218. A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to:

a)     9.8/5 N

b)    9.8/10 N

c)     9.8/2 N

d)    Zero

Ans: d

 219. A person stands at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of room, while continuing to remain in a vertical plane. The path traced by a person standing at the middle point of the slipping ladder is:

a)     A straight line

b)    An elliptical path

c)     A circular path

d)    A aparanolic path

Ans: c

 220. What is the order of magnitude of electric resistance of the human body (dry)?

a)     102 ohm

b)    104 ohm

c)     106 ohm

d)    108 ohm

Ans: c

 221. Consider the following statements:

1) During the process of osmosis the solvent travels from the concentrated solution to the dilute solution

2) In the reverse osmosis, external pressure is applied to the dilute solution.

Which of the statements given above is /are correct?

a)     1 only

b)    2 only

c)     Both 1 and  2

d)    Neither 1 nor 2

Ans: d

 222. What does the term Dolby B, or Dolby C printed on tape recorders and other sound system refer to?

a)     Frequency modulated system

b)    Amplitude Modulated system

c)     Noise reduction circuit

d)    Both DC and AC power can be used

Ans: c

 223. In which one among the following is the speed of sound maximum?

a)     Air at 0

b)    Air at 100

c)     Water

d)    Wood

Ans: d

 224. Which one of the following is printed on a commonly used fluorescent tube light?

a)     220 K

b)    273 K

c)     6500 K

d)    9000 K

Ans: c

 225. Consider the following statements:

1)    A flute of smaller length produce waves of lower frequency.

2)    Sound travel in rocks in the form of longitudinal elastic waves only.

Which of the statements given above is /are correct?

a)     1 only

b)    2 only

c)     Both 1 and  2

d)    Neither 1 nor 2

Ans: b

 226. What si the average distance (approximate) between the Sun and the Earth?

a)     70 X km

b)    100 X km

c)     110 X km

d)    150 X km

Ans: d

 227. Consider the following statements:

1.     The albedo of an object determines its visual brightness when viewed with reflected light

2.     The albedo of Mercury is much greater than the albedo of the Earth.

Which of the stamens given above is /are correct?

a)     1 Only

b)    2 only

c)     Both 1 and 2

d)    Neither 1 Nor 2

Ans: a

 228. A person is sitting in a car which is at rest. The reaction from the road ar each of the four wheels of the Car is R. When the car runs on a straight level road, how will the reaction at either of the front wheel vary?

a)     It will be greater than R

b)    It will less than R

c)     It will be equal to R

d)    It shall depend on the material of the road

Directions: The following 4 9four) items consist of two statements, one labeled as the ‘Assertion (A)’ and the other as Reason ( R) You are to examine these two statements carefully and select the correct answers to these items using the codes given below:

Ans: c

 229. Assertion (A) : Radio waves bend in a magnetic field.

Reason (R) : Radio waves are electromagnetic in nature.

a)     Both A and R are individually true and R is the correct explanation of A

b)    Both A and R are individually true but is not the correct explanation of A

c)     A is true R is false

d)    A is false but R is true

Ans: d

 230. Consider the following statements:

1)    A widely used musical scale called diatonic scale has seven frequencies.

2)    The frequency of the oe Sa is 256 HZ and that of Noise 512 b HZ

Which of the statements given above is/are correct?

a)     1 only

b)    2 only

c)     Both 1 and  2

d)    Neither 1 nor 2

Ans: c

 

 

 231. Which one of the following types is used in a laser printer?

a)     Dye lase

b)    Gas laser

c)     Semiconductor laser

d)    Excimer laser

Ans: c

 232. Consider the following statements in respect of a jet engine and a rocket:

1. A jet engine uses the surrounding air for its oxygen supply and Unsuitable for motion in space

      2. A rocket carries its won supply of oxygen in the gas from, and fuel.

 Which of the statements given above is /are correct?

a)     1 only

b)    2 only

c)     Both 1 and  2

d)     Neither 1 nor 2

Directions: The following 4 (four) items consist for two statement, one labeled as the ‘Assertion (A)’ and the other as Reason ( R). You are to examine these two statements carefully and select the correct answers to these items using the codes given below:

Ans: c

 

 233. Assertion (A) In the visible spectrum of light, red light is more energetic than green light.

Reason (R): The wavelength of red light is more than that of green light.

a)     Both A and R are individually true and R is the correct explanation of A

b)    Both A and R are individually true but is not the correct explanation of A

c)     A is true R is false

d)    A is false but R is true

Ans: d

 234. Which one of the among the following has the highest energy?

a)     Blue light

b)    Green light

c)     Red light

d)    Yellow light

Ans: a

 235. Which one of the following plants has largest number of natural apparatus?

a)     Jupiter

b)    Mars

c)     Saturn

d)    Venus

Ans: a

 236. Which one of the following planets has largest number of natural satellite or moons?

a)     Radio waves

b)    Microwaves

c)     Infra - red wave

d)    None of the above

Ans: c

 237. Which one of the following reflects back more sunlight as compared to other works?

a)     San desert

b)    Paddy crop land

c)     Land covered with fresh snow

d)    Praire land

Ans: c

238. What is the principle by which a cooling system (Radiator) in a motor car works?

a)     Conduction only

b)    Convection

c)     Radiation only

d)    Both condition and radiation

Ans: b

 239. If a potato is placed on a pure paper plate which is white and unprinted and put in a microwaves oven the potato heats up but the paper plate does not. This is because.

a)     Potato is mainly made up of starch whereas  paper is mainly made up of cellulose

b)    Potato transmits microwaves whereas  paper reflects microwaves

c)     Potato contains water wherese paper does not contain water

d)    Potato is a fresh organic material whereas paper is a dead organic material

Ans: b

 240.  Indiscriminate disposal of used fluorescent. Electric lamps causes’ mercury pollution in the environment mercury is used in the lamps because.

a)     A mercury coating on the inside of the  lamps makes the light bright white

b)    when the lamps is switched on, the mercury the lamp causes the emission of ultra - violet radiations

c)     When the lamp is switched on, it is the mercury which covers the ultra- violet energy into visible light

d)    None of the statements given above is- correct about the use of mercury in the manufacture is fluorescent lamps.

Ans: b

 241.  Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such as orbit when

1) The orbit is geosynchronous

2) The orbit is circular

3) The orbit lies in the plane of the earth’s equator.

4) The orbit is at altitude of 22, 236 km.

Which in the correct answer using the codes given below

a)     1, 2, and  3 only

b)    1, 3 and  4 only

c)     2 and 4 only

d)    1, 2, 3, and 4

Ans: a

 242. What is the difference between a CFL and LED lamp?

1. To produce light, a CFL uses mercury vapour and phowphor while an LED lamp uses semi - conductor material.

     2.  The average life span of a CFL is much longer than that of      an LED lamp.

    3. A CFL is less energy - efficient as compared to an LED lamp.

 Which of the statements given above is/are correct?

a)     1 only

b)    2 and 3 only

c)     1 and 3 only

d)    1, 2 and 3

Ans: c

 

243. An artifice satellite orbiting around the earth does not fall down. This sis so because the attraction of Earth.

a)     Deos not exist at such distance

b)    Is neutralized by the attraction of the moon.

c)     Provides the necessary speed for its steady motion.

d)    Provides the necessary acceleration for its motion.

Ans: d

 244. What is different between asteroids and comets?

1) Asteroids are small rocky planetoids, while comts are formed of frozen gases held tighter by mostly and metallic material

2)  Asteroids are found mostly between the orbits of Jupiter and Mars, while comets are found tail, while asteroids do not.

3) Comets show a partible flowing tail, while asteroids do not?

Which of the statements given above is/are correct?

a)     1 and 2 only

b)    1 and 3 only

c)     3 only

d)    1, 2 and 3

Ans: b

 245. A layer in the Earth’s atmosphere called ionosphere facilities radio communication. Why?

1) The presence of ozone causes the reflection of radio waves to earth.

2)  Radio waves have a very long wavelength

Which of the statements given above is/are correct?

a)     1 only

b)    2 only

c)     Both 1 and  2

d)    Neither 1 nor 2

Ans: d

 246. The jet aircraft fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation?

1) There are no clouds water vapor in the lower stratosphere.

2) There are no vertical winds in the lower stratosphere.

Which of the statements given above is/are correct in this context?

a)     1 only

b)    2 only

c)     Both 1 and  2

d)    Neither 1 nor 2

Ans: b

 247. The function of heavy water in a nuclear reactor is to:

a)     Slow down the speed of neutrons

b)    Increase the speed of neutrons

c)     Cool down reactor

d)    Stop the nuclear reaction.

Ans: a

 248. Consider the following statements:

If there were no phenomenon of capillarity

1.     It would be difficlut to use a kerosense lamp

2.     One would no tbe able to use a straw to consume a soft drink

3.     The blotting paper would fall to function

4.     The big trees that we saw around would not have grown on the earth

Which of the following statements given above are correct?

a)     1,2 and 3 nly

b)    1, 3 and  4 only

c)     2 and 4 only

d)    1, 2, 3 and  4

Ans: b

 249. What is the role of ultraviolet (UV) radiation in the water purification systems?

1)    It inactives /kills the harmful microganisms in water.

2)    It remoces all the undersirable odours from the water.

3)    It quickens the sedimentation of solid particles., remoces turbidity and improves th clasarity of water.

Which of the statemnts given above is /are correct?

a)     1 only

b)    2 and 3 only

c)     1 and 3 only

d)    1, 2 and  3

Ans: a

 250. Electrically charged particles form space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the earth. What prevents them from reaching the surface of the earth?

a)     The Earth’s magnetic field diverts them toward its poles

b)    Ozone layer around the Erath reflects them back to outer space

c)     Moisture in the upper layer of atmosphere prevents them from reaching the surface of the Erath

d)    None of the statements (a), (b) and (c) is correct.

Ans: a