PHYSICS - RAILWAY RECRUITMENT BOARD ASSISTANT LOCO PILOT EXAMINATION

1. The dimensions of Planck’s constant are the same as the dimensions of—

(a) Energy (b) Frequency (c) Lienar Momentum (d) Angular Momentum (e) None of the above

2. The blue colour of the water in the Sea is due to—

(a) refraction of the blue light by the impu-rities in the Sea water.

(b) reflection of blue sky by Sea water (c) scattering of blue light by water molecules (d) absorption of other colours except the blue

colour by water molecules (e) blue colouring of the Sea water

3. Sometimes the tubes in the well-inflated tyres of a cycle left in the sun burst open—

(a) Because the pressure of air inside the tube increases

(b) Because the volume of air inside the tube increases due to rise in its temperature (c) Because the tube containing air melts (d) Because the volume and the pressure both

increase

(e) Nothing of the above

4. A glass tumbler containing ice shows droplets of water on the outer surface because—

(a) The outer surface of the tumbler shows hygroscopic effect

(b) Water from inside oozes out through the wall of the tumbler

(c) The moisture in the air on coming in contact with the cold surface of the tumbler condenses in the form of droplets of water (d) (a) & (b)

(e) None of the above

5. Galvanized iron is coated with a thin coating of—

(a) Copper (b) Tin

(e) White lead

6. Tick out the only wrong statement in the following—

(a) Light travels with a speed greater than that of sound

(b) Light cannot travel through vacuum (c) Light travels in a straight line (d) Light is a wave motion (e) Light shows diffraction

7. In the visible spectrum the colour having the shortest wavelength is—

(a) Violet (b) Blue

(e) Green

8. The unit of power is—

(a) Joule per second only (b) Joule only

(e) Erg.

9. The heater element in an electric iron is made of—

(a) Copper (b) Tungsten

10. If woollen cloth of red colour is seen in the light of a mercury vapour lamp, then the cloth will appear—

(a) Black (b) Red

(e) Violet

11. At sun rise or at sun set, the sun appears to be reddish while at midday it looks white. This is because—

(a) The sun is colder at sunrise or at sunset

4/ E.S.

(b) Diffraction sends red rays to the earth at these times

molecules causes this phenomenon (e) None of these

12. Water is transparent to visible light. Still it is not possible to see objects at a distance in fog which consists of fine drops of water suspended in the air. This is so because—

(a) Fog affects our vision adversely

(b) Fine drops of water are opaque to visible light

(d) The light rays suffer total internal reflec-tion and cannot reach the eyes of the observer

(e) Both (a) and (d) are correct

13. The radiant energy of the sun results from—

(a) Nuclear fusion (b) Nuclear fission (c) Cosmicradiation (d) Combustion (e) Explosion

14. A microscope, in which maximum magni-fication is achieved, but the object cannot be seen by eye, is called—

(a) simple microscope (b) dissecting microscope (c) electron microscope (d) phase contrast microscope (e) compound microscope

15. The image formed on the retina of the eye is—

(a) upright and real (b) virtual and upright (c) real and inverted (d) enlarged and real (e) larger than the object

16. The transverse nature of light is shown by—

(a) refraction of light (b) reflection of light (c) interference of light (d) polarization of light (e) dispersion of light

17. The surface water in a lake is just going to freeze. What is the termperature of water at the bottom ?

(a) 0°C (b) more than 4°C (c) 4°C (d) less than 4°C (e) – 2°C

18. If you float on your back on water, your weight is—

(a) Equal to your normal weight (b) Half of your normal weight (c) Zero

(d) Greater than the weight of water displaced by you

(e) Less than the weight of water displaced by you

19. Which of the following is the most viscous medium ?

(a) coaltar (b) water

20. In a Bunsen’s burner, use is made of—

(a) Surface tension (b) Suction Pump (c) Boyle’s Law (d) Bernoulli’s theorem (e) Archmedes’ principle

21. Railway tracks are banked on curves so that—

(a) no frictional force may be produced bet-ween the track and the wheels

(b) the train may not fall down inwards (c) the weight of the train may be reduced (d) necessary centripetal force may be

ob-tained from the horizontal component of the weight of the train

(e) necessary centrifugal force may be ob-tained from the horizontal component of the weight of the train

22. The density of water is maximum at—

(a) 0°C (b) 4°C

(e) 100°C

23. Oil rises up the wick in a lamp because—

(a) oil is volatile (b) oil is very light

(c) of the surface tension phenomenon (d) of the diffusion of oil through the wick (e) of the capillary action phenomenon

E.S./ 5 24. An ice cube contains an iron ball in it and floats

in water contained in a vessel. What will happen if the ice melts away ?

(a) The water level will go up (b) The water level will go down

will go down (e) None of these

25. Which of the following utilizes Newton’s third law of motion ?

(a) Archery (b) Space-rocket (c) Venturimeter

(d) Internal combustion engine (e) Kite flying

26. The function of cement in masonry is based on the phenomenon of—

(a) adhesion (b) cohesion (c) rigidity (d) elasticity (e) flexibility

27. The main source of heat is—

(a) the sun

(b) the stars (excluding the sun) (c) the interior of the earth (d) chemical reactions (e) electricity

28. Transmission of heat by the movement of heated particles is called—

(a) Conduction (b) Convection (c) Radiation (d) Regelation (e) Expansion

29. The air becomes heated by—

(a) Conduction (b) Convection (c) Radiation (d) Expansion (e) Diffussion

30. In a thermosflask, a warm substance remains warm because—

(a) transfer of heat has been minimised in it (b) no heat either enters into nor leaves the

inside of the thermosflask by any of the three methods of transmission conduction, convection and radiation

(d) thermosflask is made of a material having the property of maintaining temperature at constant

(e) none of these

31. To a space traveller on the moon during day time the lunar sky appears—

(a) blue (b) black

(e) yellow

32. At which temperature do the reading of the Centigrade and the Fahrenheit scales coincide?

(a) 0° (b) 100°

(e) none of these 33. Sound is a form of—

(a) energy (b) matter (c) radiation

(d) electromagnetic energy (e) none of these

34. Lightning is observed earlier than the sound is heard, bacauase—

(a) light travels faster than sound (b) thunder is produced later

(d) man’s sense of vision is sharper than his sense of hearing

(e) none of these

35. Which of the following statements is true—

(a) Sound waves, not light waves, bend around obstacles

(b) Light waves, not sound waves, bend around obstacles

(d) Neither sound waves not light waves bend around obstacles

(e) None of these

36. The instrument connected with the recording and reproduction of sound is called—

(a) Gramophone (b) Headphone (c) Hydrophone (d) Ear Phone (e) None of these

6/ E.S.

37. A mirage is the result of—

(a) the reflection of light from hot sand (b) fluctuation in the refractive index of the

atmosphere with height

(d) decrease in the refractive index of the atmosphere with height

(e) none of these

38. How should a man wearing spectacles work with a microscope ?

(a) He should keep on wearing spectacle (b) He should take off spectacle

diffe-rence

(e) None of these

39. A person cannot see objects clearly which are nearer than 75 cms. from his eyes. What disease is he suffering from ?

(a) Astigmatism (b) Colour blindness (c) Myopia (d) Hypermetropia (e) Hydrophobia

40. A man cannot see clearly beyond 10 metres.

What disease is he suffering from ? (a) Far sight (b) Myopia (c) Hypermetropia (d) Cataract (e) None of these

41. A pond of clear water appears less deep than it really is. This is due to—

(a) reflection (b) refraction

(e) none of these

42. The speed of light was first measured by—

(a) Romer (b) Newton

(e) Davy

43. Anearthsatellite is kept moving in its orbit. It is due to the phenomenon of centripetal force provided by—

(a) therocket engine propelling the Satellite (b) the gravitational attraction of the earth on

the satellite

(d) the gravitational attraction of the celestial bodies inhabiting the space

(e) the gravitational attraction of the sun on the satellite

44. The phenomenon of radio activity is associated with—

(a) emission of electrons (b) emission of spectra (c) fusion of nucleus (d) decay of the nucleus (e) none of these

45. Conversion of heat into electrical energy can be achieved by using a—

(a) ammeter (b) hydrometer (c) voltmeter (d) thermocouple (e) photo-electric tube

46. A ‘Celsius’ is a unit—

(a) of electric potential difference (b) of heat potential difference (c) of trignometeric angle (d) equivalent to degree kelvin (e) equivalent to degree centigrade

47. Which of the following may be used as fuel for nuclear reactors ?

(a) Plutonium (b) Cadmium

(e) Chromium

48. The men talking on the surface of the moon—

(a) cannot hear the sound of each other (b) hear the same sound again and again (c) hear the sound of each other in less time

than on the earth

(d) can hear the sound but its intensity will be very low

(e) find the sound of their voices magnified 49. X-rays were discovered by—

(a) Thomson (b) Braggs

50. The Theory of Electrolysis was propounded by—

(a) Ohm (b) Faraday (c) Coulomb

(d) Coulomb and Faraday jointly (e) None of these

E.S./ 7 51. Which one of the following is not a primary

colour ?

(a) red (b) green

(e) all the primary colours

52. The earth moves round the sun in an elliptical path and not in circular one, so the distance between the two is not fixed but keeps on varying as the earth goes around the sun. The speed of the earth in its orbital path around the sun—

(a) is variable

(b) decreases when the distance between them increases and vice versa

(d) increases when the distance between them increases and vice versa

(e) none of these

53. Kinetic energy is the energy possessed by the body by virtue of its motion, potential energy is possessed by the body by virtue of its—

(a) size (b) weight or mass (c) volume (d) position or shape (e) density

54. A ray of light from air enters water, then through a thick layer of glass placed below water. After passing through glass, it again comes out in air medium. Then the final emergent ray will—

(a) bend towards the normal (b) bend away from the normal

(d) suffer lateral displacement (e) none of the above

55. Water in a reservoir exerts pressure—

(a) upwards only (b) downwards only (c) side ways (d) in all directions (e) all the above are wrong

56. Welding is to joint two pieces of metal by raising the temperature at the joint by means of the external heat of heavy electric current, soldering is—

(a) separating two pieces of metal by melting by external heat

(b) melting to liquid the two pieces of different metals and mixing them to obtain a new metal

(d) joining two pieces of metals by means of nails without using heat

(e) both (b) and (d)

57. Two objects losing the same weight when immersed in water must have the same—

(a) weight in air (b) weight in water (c) weight anywhere else (d) volume

(e) density

58. Mention the ray which appears to originate outside of the earth—

(a) cosmic ray (b) the ultra-violet ray (c) the alpha ray (d) the beta ray (e) the X-ray

59. What is always contained in amalgams ? (a) mercury (b) iron

(e) zinc

60. Sound travels fastest in—

(a) water (b) steel

(e) alcohol

61. Which of the following radiations is not dangerous ?

(a) cosmic rays (b) ultra-violet rays (c) X-ray

(d) shortradiowaves (e) gamma rays 62. Jet engines are—

(a) turbine engines (b) reaction engines (c) rotary engines

(d) external combustion engines (e) nuclear engines

8/ E.S.

63. A sensitive magnetic instrument can be sheil-ded very effectively from outside fields by placing it inside a box of—

(a) plastic (b) teak wood

64. The temperature below which a gas should be cooled before it can be liquefied by pre-ssure only, is termed as—

(a) the freezing point (b) the dew point

65. Water is used in hot water bottles because—

(a) it is easily obtained in pure form (b) it has high specific heat

(e) nothing of these

66. A number of images of a candle flame can be seen in a thick mirror. The brightest image is—

(a) last (b) fourth

(e) first

67. Hydrogen bomb is based on the pheno-menon of—

(a) nuclear fusion (b) nuclear fission (c) nuclear reaction (d) nuclear explosion (e) none of these

68. The rate of loss of heat by a hot body depends upon—

(a) its radiating area (b) its temperature

(e) none of these

69. Comets are luminous celestial bodies moving around the—

(a) Sun (b) Moon

(e) Mars

70. It takes less time for food to be cooked in a pressure cooker. It is because—

(a) boiling point of water increases (b) boiling point of water decreases (c) food consumes less heat (d) it gives heat internally (e) the statement itself is incorrect

71. The process in which no heat change takes place is—

(a) a reversible process (b) a irreversible process (c) an isothermal process (d) an adiabatic process (e) an entropic process

72. The name of the galaxy in which the earth is a planet is—

(a) Ursa Major System (b) Ursa Minor System (c) The milky way (d) Solar system (e) Andromeda

73. Two pieces of gold and silver weighing 100 gm. each are immersed in a liquid. Then what will happen ?

(a) both pieces will weigh the same (b) gold piece will weigh more (c) silver piece will weigh more

(d) it will depend on the density of the liquid 74. An athelete claimed that his timing for a 100 m

dash should be corrected because the starting signal was given by a gun fired from a point 10 m away from him and the time-keeper was standing close to the gun. The eroor due to this could be—

(a) 0·6 sec. (b) 0·3 sec.

75. The material used in the manufacture of lead pencils is—

(a) graphite (b) lead

(e) manganese

76. Transformer is a device to convert—

(a) D.C. into A.C.

(b) Low voltage D.C. into high voltage D.C.

(d) Mechanical energy into electrical energy

E.S./ 9 77. In a diesel engine the high temperature needed

to ignite the fuel is achieved by—

(a) by a spark plug

(b) compressing air in the cylinder (c) heating the cylinder with a flame (d) using heat from exhaust

(e) none of these

78. The device used for converting alternating current to direct current is called—

(a) Inverter (b) Rectifier (c) Transmitter (d) Transformer (e) Transducer

79. Wollen clothes keep us warm in winter because they—

(a) prevent cold air from entering the body (b) prevent the heat of the body from escaping (c) do not radiate heat

(d) supply extra heat to the body

(e) they produce heat in the body by some chemico-physical reaction

80. Water pipes are apt to burst in cold weather because—

(a) on account of snow heavy pressure is exerted

(b) the water in the pipe cannot evaporate (c) they contract in cold

(d) they expand in cold

(e) the water in the pipe freezes into ice and expands

81. Metal tea pots have wooden handles beca-use—

(a) wood is bad conductor of heat (b) it prevents electric shock (c) it gives beauty to the pots (d) it is hygienic

(e) none of these

82. A Sextant is used to measure—

(a) height of an object (b) volume of a building (c) breadth of a tower (d) area of a place (e) length of a space

83. The image of anything seen through an ordi-nary looking glass is—

(a) inverted

(b) not visible in strong light (c) a little bigger than the object (d) a little smaller than the object (e) laterally inverted

84. Theboilingpointofwaterisnotaffected by—

(a) the external pressure

(b) the altitude at which water is boiled (c) the amount of dissolved substances (d) the kind of dissolved substances (e) the temperature of the heat source

85. Which of the following statement is wrong?

(a) Sound travels as waves (b) Sound travels as straight lines

(d) Sound is a form of energy

(e) Sound travels faster in vacuum than in air 86. the principle involved in the absorption of ink

orwaterbyapieceofblottingpapersis—

(a) sucktion action (b) principle of absorption (c) capillary action (d) offset procedure (e) condensation

87. Tick out the only scalar quantity from the follo-wing—

(a) force (b) velocity

(e) acceleration

88. When a man circles round the earth in a sate-llite then his—

(a) mass becomes zero but weight remains constant

(b) mass remains constant but weight becomes zero

89. The colour of a star is an indication of its—

(a) weight (b) temperature

10/ E.S.

90. The tides in the ocean are due to—

(a) wind over the oceans

(b) gravitational pull of the moon (c) rotation of the earth

(d) revolution of the earth

91. The dense mass of small water drops on smoke or dust particles in the lower layers of the atmosphere is—

(a) Dew (b) Fog

92. When water freezes its density—

(a) increases (b) decreases (c) remains constant (d) becomes zero 93. For stable equilibrium of a floating body it is

necessary that its metacentric should be—

(a) above its centre of gravity (b) below its centre of gravity

gravity

94. A ball is thrown vertically in vacuum. It goes up and falls down on the earth. Which of the given figures represents its true time-velocity graph.

TIME TIME

(b) (a)

VELOCITY VELOCITYVELOCITY

VELOCITY

95. The figure represents time-velocity graph of a moving body. How much distance does the body cover ?

TIME (s) 0

VELOCITY (m/s)

1 2 3 4 5 6

5 10 15 20

(a) 20 metres (b) 30 metres (c) 40 metres (d) 50 metres 96. The Sri Lanka Broadcasting Corporation

broadcasts its programmes on the 25 metre band. Which one of the following is the frequ-ency of broadcasting ?

(a) 12 Kilo Hertz (b) 1·2 Mega Hertz (c) 12 Mega Hertz (d) 120 Mega Hertz 97. The phenomenon of polarisation in light

indicates that—

(a) Light waves are longitudinal (b) Light waves are transverse (c) Light waves exhibit diffraction (d) Light waves undergo interference

98. A double convex air bubble in water would behave as a—

(a) convergent lens (b) divergent lens

99. Parsec is a measure of—

(a) brightness of heavenly body (b) astronomical distance (c) density of stars

(d) orbital velocity of giant stars

100. What will be potential difference between points A and B in the following circuit?

2Ω 1Ω

V = ? 1 VOLT C E

I I

+ _

(a) 1 Volt (b) 2 Volts

(b) 3 Volts (d) 4 Volts

E.S./ 11

Dalam dokumen RAILWAY RECRUITMENT BOARD ASSISTANT LOCO PILOT EXAMINATION (Halaman 150-158)