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TRAIN-WAY > RL PHY 1 > Flashcards

RL PHY 1 Flashcards

1
Q

●Ozone layer in the upper atmosphere is due to thereactions of: —

A

oxygen and ultraviolet rays

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2
Q

●Radiocarbon is produced in the atmosphere as aresult of:—

A

collision between fast neutrons andnitrogen nuclei present in the atmosphere

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3
Q

●Light year is a unit of: —

A

Distance

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4
Q

●What will happen if the star having mass greaterthan five times of the Sun is dead? —

A

Black Holeswill form

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5
Q

●The refractive index of the different layers of theearth’s atmosphere changes continuously,consequently the position of the image of a startchanges with time. Which of the following doesthis fact support? —

A

Twinkling of stars

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6
Q

●Inside an aeroplane, flying at a high altitude:—

A

normal atmospheric pressure is maintained by theuse of air pumps

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7
Q

●A vacuum cleaner works on the principle of pressuredifference. On the moon it will: —

A

Not work at all

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8
Q

●The height of a geo-stationery satellite from theEarth’s surface is approximately: —

A

36,000 km

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9
Q

●The technique of collecting information about anobject from a distance without making physicalcontact with it is:—

A

Remote Sensing

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10
Q

●Suppose a rocketship is receding from the Earth at aspeed of 2/10 th the velocity of light. A light in therocketship appears blue to the passengers on theship. What colour would it appear to an observeron the Earth? —

A

Blue

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11
Q

●Cryogenic engines find applications in:—

A

Rockettechnology

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12
Q

●A person in a spaceship located half way between theEarth and the Sun will notice that: —

A

Sky is jetblack

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13
Q

●A person in a spaceship located half way between theEarth and the Sun will notice that: —

A

Stars do nottwinkle

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14
Q

●The tail of comet is directed away from the sunbecause:—

A

As the comet rotates around the sun,the lighter mass of the comet is pushed away dueto the centrifugal force alone

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15
Q

●One astronomical unit is the average distancebetween:—

A

Earth and the Sun

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16
Q

●The mass of a body on earth is 100 kg (accelerationdue to gravity, ge = 10 m/s2. If acceleration due togravity on the moon is ge/6, then the mass of thebody on the moon is:—

A

100 kg

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17
Q

●Which technology is primarily used with newphysical communication medium such as satelliteand fibre optics transmission? —

A

Digitaltechnology

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18
Q

●A geostationary satellite revolves around the earthfrom west to east in an orbit coplanar withequatorial plane at a height of about _____ abovethe surface of earth. —

A

36000 km

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19
Q

“●In general what is range of frequency of the ““MessageSignal””?—”

A

Radio Frequency

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20
Q

●The formation of three dimension image byinterference of two light beams from the laser orother coherent source of light is called: —

A

Holography

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21
Q

●Diamond Ring, God’s Eye and Baily’s Beads are theparts of phenomenon? —

A

Solar eclipse

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22
Q

●Geostationary satellite completes its one revolutionaround the earth in:—

A

24 hours

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23
Q

●Size of the sun at dusk, Colour of the sun at dawnand Twinkle of stars in the sky are examples of: —

A

Optical Illusion

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24
Q

●Light from the Sun reaches us in nearly: —

A

8 minutes

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25
Q

●Stars appears to move from east to west because:—

A

the earth rotates from west to east

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26
Q

●Planets do not twinkle because:—

A

They are nearer toearth and hence we receive a greater amount oflight and, therefore minor variations in theintensity are not

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27
Q

●In the atmosphere ultraviolet rays are absorbed by:—

A

Oxygen

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28
Q

●Where are mesons found? —

A

Cosmic Rays

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29
Q

●The atmospheric layer reflecting radio waves iscalled:—

A

Ionosphere

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30
Q

●Heat from the sun reaches earth by the process of:—

A

Radiation

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31
Q

●Hydrogen spectrum was first explained by: —

A

NielBohr

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32
Q

●The source of the sun’s energy is the process of:—

A

Nuclear Fusion

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33
Q

●Remote-sensing device has an inbuilt source of:—

A

Infrared Ray

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34
Q

●The atmosphere is heated mainly by:—

A

Radiation

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35
Q

●The sensation of weightlessness in a spacecraft in anorbit is due to the:—

A

acceleration in the orbitwhich is equal to the acceleration due to gravityoutside

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36
Q

●We always see the same face of the moon, because:—

A

It takes equal time for revolution around the earthand rotation on its own axis

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37
Q

●Which layer of the earth’s atmosphere reflect backthe radio waves to the earth’s surface? —

A

Ionosphere

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38
Q

●Sound cannot pass through: —

A

Vacuum

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39
Q

●The spoon dropped by an astronaut in a satellite will:—

A

continue to follow the motion of the satellite

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40
Q

●When a body is taken from earth to moon:—

A

weightchanges but mass remains same

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41
Q

●The instrument used to see the distant objects on theEarth is:—

A

Terrestrial Telescope

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42
Q

●The ozone hole that has been detected lies in theatmosphere above: —

A

Antarctica

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43
Q

●The sky appears blue because: —

A

the atmospherescatters blue colour more than the others

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44
Q

●The period of revolution of a geostationary satelliteis:—

A

24 hours

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45
Q

●The atmospheric air is held to the Earth by: —

A

Gravity

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46
Q

●Name the process of production of energy in the Sun:—

A

Nuclear Fusion

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47
Q

●Eclipses occur due to which optical phenomena?—

A

Rectilinear propagation

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48
Q

●In the absence of ozone layer, which rays will enterinto atmosphere? —

A

Ultraviolet rays

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49
Q

●Necessary element of change in solar energy toelectric energy is: —

A

Silicon

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50
Q

●It is dangerous to observe Solar Eclipse with nakedeyes because:—

A

Ultraviolet radiations from Sunburn our retina

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51
Q

●The minimum number of geostationary satellitesneeded for uninterrupted global coverage is: —

A

2

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52
Q

●The energy that can harness heat stored below theearth’s surface is known as: —

A

Geo-thermalenergy

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53
Q

●A man inside an artificial satellite feels weightlessnessbecause the force of attraction due to the Earth is:—

A

Zero at that place

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54
Q

●Large astronomical telescopes always use asobjective:—

A

combinations of lenses

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55
Q

●The energy required to remove an electron in ahydrogen atom from state is: —

A

0.136 eV

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56
Q

●Who developed the technology of undergroundnuclear explosion? —

A

Dr. Homi Jahangir Bhabha

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57
Q

●In a nuclear reactor, self-sustained chain reaction ispossible, because:—

A

more neutrons are released ineach of the fission reactions

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58
Q

●Radioactivity is due to: —

A

Unstable nucleus

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59
Q

●In nuclear reactor, heavy water is used as: —

A

Moderator

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60
Q

●In a nuclear reactor, self-sustained chain reaction ispossible, because: —

A

the neutrons immediatelytake part in the fission process

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61
Q

●Curie is the unit of: —

A

Radioactivity

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62
Q

●Energy is continuously created in the sun due to:—

A

Nuclear Fusion

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63
Q

●Gamma Rays can cause: —

A

Gene Mutation

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64
Q

●Atomic power plant works on the principle of: —

A

Fission

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65
Q

●Which type of reaction produces the most harmfulradiation?—

A

Fission reaction

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66
Q

●Gamma rays have greatest similarity with: —

A

X Rays

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67
Q

●Radiocarbon dating technique is used to estimate theage of:—

A

Fossils

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68
Q

●Natural radioactivity was discovered by:—

A

HenriBecquerel

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69
Q

●Weak nuclear force causes: —

A

Radioactivity

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70
Q

●The efforts to detect the existence of Higgs bosonparticle have become frequent news in the recentpast. What is /are the importance/importance ofdiscovering this particle?—

A

It will enable us tounderstand as to why elementary particles havemass

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71
Q

●The mass of a star is two times the mass of the Sun.How it will come to an end?—

A

Neutron Star

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72
Q

●What is the minimum escape velocity of rocket to belaunched into space? —

A

11 Km/Sec

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73
Q

●Isotopes of an element contain:—

A

the same number ofprotons but different number of neutrons

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74
Q

●The difference between a nuclear reactor and anatomic bomb is that: —

A

the chain reaction innuclear reactor is controlled

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75
Q

●Nuclear sizes are expressed in a unit named:—

A

Fermi

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76
Q

●The half life of a radioactive element which has only1/32 of its original mass left after a lapse of 60days is: —

A

32 days

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77
Q

●The spectral series of the hydrogen spectrum that liesin the ultraviolet region is the: —

A

Lyman Series

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78
Q

●The mass number of a nucleus is:—

A

Sometimes morethan and sometimes equal to its atomic number

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79
Q

●The particles which can be added to the nucleus of anatom without changing its chemical properties arecalled:—

A

Neutrons

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80
Q

●A radioactive substance has a half life of 60 minutes.After 3 hours, the fraction of atom that havedecayed would be:—

A

12.5 %

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81
Q

●Hydrogen atom excites energy level fromfundamental state to n = 3. Number of spectrumlines according to Bohr, is:—

A

3

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82
Q

●In any Bohr orbit of the hydrogen atom, the ratio ofkinetic energy to potential energy of the electronis: — -

A

1/2

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83
Q

●Number of spectral lines in hydrogen atom is: —

A

Infinite

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84
Q

●When a hydrogen atom is raised from the groundstate to an excited state: —

A

Potential EnergyIncreases and Kinetic Energy Decreases

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85
Q

●In the spectrum of hydrogen atom, the ratio of thelongest wavelength in Lyman series to the longestwavelength in the Balmer series is: —

A

5/27

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86
Q

●The decay constant of a radioactive element is 0.01per second. Its half life period is: —

A

693 second

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87
Q

●Which model states that Mass of electron remainsconstant and Electrons in a quantized orbit willnot radiate energy?—

A

Bohr’s Model

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88
Q

orbit of higher energy? —

A

Energy is absorbed

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89
Q

●The impurity atom with which pure silicon should bedoped to map a p-type semiconductor are thoseof: —

A

Boron

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90
Q

●The tendency of a liquid drop to contract and occupyminimum area is due to: —

A

Surface Tension

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91
Q

●Who gave the first experimental value of G?—

A

Cavendish

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92
Q

●A cold soft drink is kept on balance. When the cap isopened, then the weight: —

A

First increases andthen decreases

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93
Q

●A girl is swinging on a swing in sitting position. Whenthe girl stands up, the period of swing will:—

A

Beshorter

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94
Q

●A hunter aims his gun at a point between theeyebrows of a monkey, sitting on a branch of atree. Just as he fires, the monkey jumps down. Thebullet will:—

A

hit the monkey at the point aimed

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95
Q

●A man standing on a completely frictionless surfacecan propel himself by: —

A

Whistling

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96
Q

●If no external force acts on a system, its ____ cannotchange.—

A

Momentum

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97
Q

●When a simple pendulum is set into oscillation, theacceleration is ___ when the bob passes throughthe mean position.—

A

Zero

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98
Q

●In an oscillating simple pendulum, the bob attains agiven velocity _____ in each cycle. —

A

Twice

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99
Q

●In an oscillating pendulum, the amplitude of thesimple pendulum decreases with: —

A

Time

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100
Q

●An iron ball floats on mercury but gets immersed in:—

A

Water

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101
Q

●A solid cube just gets completely immersed in waterwhen a 0.2 kg mass is placed on it. If the mass isremoved, the cube is 2 cm above the water level.What is the length of each side of the cube? —

A

10cm

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102
Q

●The weight of a body decreases with the increase of:—

A

altitude on earth

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103
Q

●In an air-conditioner, heat is extracted from the roomair at the evaporator coils and is rejected out atthe:—

A

Condenser coils

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104
Q

●A 4-wheel vehicle moving in a sharp circular path athigh speed will: —

A

Overturn about its outerwheels

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105
Q

●An oil tanker is partially filled with oil and movesforward on a level road with uniform acceleration.The free surface of oil then: —

A

is inclined to thehorizontal with larger depth at the rear end

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106
Q

●The velocity of sound in air is not affected by thechange in:—

A

amplitude and frequency

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107
Q

●The velocity of sound in air increases with the ____ oftemperature. —

A

Increase

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108
Q

●If the radius of the earth were to shrink by one percent, its mass remaining the same, the value of gon the earth’s surface would: —

A

increase by 2%

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109
Q

●A car is running on a road at a uniform speed of 60kmh. The net resultant force on the car is: —

A

equal to zero

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110
Q

●A spherical body moves with a uniform angularvelocity around a circular path of radius r. In thiscontext, which of the following statements is/arecorrect? —

A

The body has a radial accelerationdirected toward centre of path

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111
Q

●A weightless rubber balloon is filled with 200 cc ofwater. Its weight in water is equal to: —

A

Zero

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112
Q

●Ball bearings are used in cycles, scooters etc to: —

A

Reduce the friction between the wheel and theaxle

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113
Q

●In case of uniform circular motion, the accelerationis:—

A

Variable in magnitude but constant indirection

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114
Q

●A corked bottle full of water when frozen will breakbecause:—

A

The volume of water decreases onfreezing

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115
Q

●In an electronic watch, the component correspondingto pendulum of a pendulum clock is a: —

A

crystaloscillator

116
Q

●It is easier to roll a stone up a sloping road than to liftit vertical upwards because: —

A

work done inrolling a stone is less than in lifting it

117
Q

●The absorption of ink by blotting paper involves:—

A

capillary action phenomenon

118
Q

●Siphon will fail to work if the level of the liquid in thetwo vessels are at: —

A

The same height

119
Q

●Pa (Pascal) is the unit for: —

A

Pressure

120
Q

●Let a thin capillary tube be replaced with anothertube of insufficient length then, we find water: —

A

will not rise

121
Q

●If two bodies of different masses, initially at rest, areacted upon by the same force for the same time,then the both bodies acquire the same:—

A

Momentum

122
Q

●Find the maximum velocity for the overturn of a carmoving on a circular track of radius 100 m if theco-efficient of friction between the road and tyre is0.2? —

A

14 m/s

123
Q

●Materials for rain-proof coats and tents owe theirwater-proof properties to: —

A

Surface Tension

124
Q

●On a clean glass plate a drop of water spreads toform a thin layer whereas a drop of mercuryremains almost spherical because: —

A

cohesion ofmercury is greater than its adhesion with glass

125
Q

●Oil raise up the wick in a lamp. The principleinvolves:—

A

capillary action phenomenon

126
Q

●Railway tracks are banked on curves because:—

A

necessary centripetal force may be obtained fromthe horizontal component of the weight of thetrain

127
Q

●Mercury is commonly used as a thermometric fluidrather than water because:—

A

Mercury has greatervisibility than water

128
Q

●On a stationary sail boat, air is blown from a fanattached to the boat. The boat: —

A

does not move

129
Q

●ML2 T-2 is the dimensional formula for:—

A

coupleacting on a body

130
Q

●One watt-hour is equivalent to: —

A

3.6 × 103 J

131
Q

●One nanometer is equal to: —

A

10-9m

132
Q

●Mica is used in electrical appliances such as electriciron because mica is: —

A

Electrical

133
Q

●It is easier to roll a barrel full of coal tar than to pullit because:—

A

the rolling friction is much less thanthe sliding friction

134
Q

●Minimum number of unequal vectors which can givezero resultant are: —

A

Three

135
Q

●Rain is falling vertically downwards. To a manrunning east-wards, the rain will appear to becoming from: —

A

East

136
Q

●An aeroplane is flying horizontally with a velocity of600 km/h and at a height of 1960 m. When it isvertically at a point A on the ground a bomb isreleased from it. The bomb strikes the ground atpoint B. The distance AB is: —

A

3.33 km

137
Q

●If adjacent layers of material are displaced laterallyover each other, then the deformation of thematerial is called:—

A

Shear

138
Q

●All liquids and gases stick to a solid surface so thatwhen they flow the velocity must graduallydecrease to zero as the wall of the pipe orcontainer is approached. This is called:—

A

Viscosity

139
Q

●When the fluid particles passing successively througha given point in a fluid always follow the samepath afterwards, the flow is said to be: —

A

Steady

140
Q

●During the flow of liquid, the slower, lower layerexerts a tangential retarding force on the upperfaster layer and experiences itself an equal andopposite tangential force. This is called:—

A

Tangential stress

141
Q

●Viscosity is measured in: —

A

Pascal second

142
Q

●Diamond is a polymorph of graphite. Both containcarbon atoms. Diamond is obtained afterapplying:—

A

Very high pressure and hightemperature

143
Q

●Which element present in groundwater can bepartially removed along with removal of iron byprecipitation/coagulation method if iron is alsopresent in the water? —

A

Arsenic

144
Q

●The known forces of nature can be divided into fourclasses, viz, gravity, electromagnetism, weaknuclear force and strong nuclear force. Withreference to them, which one of the followingstatements is correct?—

A

Weak nuclear forcecauses radioactivity

145
Q

●When the speed of car is doubled then what will bethe braking force of the car to stop it in the samedistance?—

A

Four times

146
Q

●The dimension of which of the following is the sameas that of impulse?—

A

Momentum

147
Q

●If the diameter of a capillary is doubled, then the riseof water in it will be: —

A

Half

148
Q

●Why the needle of iron swims on water surface whenit is kept gently?—

A

Due to surface tension

149
Q

●How much calorie of energy is released by a boiledegg?—

A

77 calorie

150
Q

●A boat will submerge when it displaces water equal toits own: —

A

weight

151
Q

●Surface tension in a liquid is due to:—

A

Cohesive forcebetween molecules

152
Q

●A circular plate, a cube and a sphere, all made up ofsame material and having the same mass areheated to 300 degree C and left in a room. Whichof them will have the slowest rate of cooling? —

A

Sphere

153
Q

●Boyle’s Law holds good for any gas at:

A

Low temperature and high pressures

154
Q

●An ice block with a piece of lead embedded in it floatsin water. If ice melts, the water level: —

A

Falls

155
Q

●The velocity of heat radiation in vacuum is:—

A

Equalto that of light

156
Q

●The plastic material commonly used for making gearwheels is: —

A

Nylons

157
Q

●The substance which conducts current in the solidstate is:—

A

Graphite

158
Q

●Coolis tube is used to produce: —

A

X-Rays

159
Q

●Which set of conditions represents the easiest way toliquefy a gas? —

A

Low temperature and highpressure

160
Q

●What principle/law explains the working of thehydraulic brakes in automobiles? —

A

Pascal’s Law

161
Q

●Mist is caused by: —

A

Water vapour at lowtemperature

162
Q

●While catching a ball, a player pulls down his handsto lower the: —

A

Momentum

163
Q

●When a barometer reading suddenly recedes, itindicates that climate will be: —

A

Extremelystormy

164
Q

●A particle dropped from the top of a tower uniformlyfalls on ground at a distance which is equal to theheight of tower. Which of the following paths willbe traversed by the particle?—

A

Parabolic

165
Q

●When a bottle of scent is kept open in a corner of aroom its odor is felt in all parts of the room. Thisis due to the phenomenon of: —

A

Diffusion

166
Q

●When the barometer reading dips suddenly, it is anindication of: —

A

Storm

167
Q

●Solar energy is converted into chemical energyduring:—

A

Photosynthesis

168
Q

●If the velocity-time graph of a particle is representedby y = mt + c, then the particle is moving with:—

A

Constant acceleration

169
Q

●A passenger standing in a bus is thrown outwardwhen the bus takes a sudden turn. This happensdue to:—

A

Inertia of Motion

170
Q

●When pressure is increased the melting point of ice:—

A

Decreases

171
Q

●Plants are dried up in winter due to frost because:—

A

There is mechanical loss of tissues and droughtcondition prevails

172
Q

●For a body moving with non-uniform velocity anduniform acceleration:

A

Displacement - Time graph is non-linear

173
Q

●The fourth state of matter is known as: —

A

Plasma

174
Q

●Decibel is the unit used for: —

A

Intensity of sound

175
Q

●The term ‘isoneph’ indicates the lines of equal:—

A

Cloudiness

176
Q

●The mass-energy relation is the outcome of:—

A

Specialtheory of relativity

177
Q

●Why does bleeding occur through the nose in highmountainous regions?

A

The blood pressure of a person increases at highaltitudes

178
Q

●Knot is a measure of: —

A

Speed of ship

179
Q

●Boyle’s law is a relationship between:—

A

Pressure andVolume

180
Q

●Pycnometer is an instrument used to measure the:—

A

Density

181
Q

●Who defined the law of gravitation? —

A

Newton

182
Q

●A hydrogen balloon floats up because of:—

A

weight ofthe balloon is less than the weight of air displacedby it

183
Q

●In a rechargeable cell what kind of energy is storedwithin the cell? —

A

Chemical energy

184
Q

●During washing of clothes, we use indigo due to its:—

A

proper pigmental composition

185
Q

●The energy stored in a watch spring is: —

A

Potentialenergy

186
Q

●’Therm’ is the unit of: —

A

Heat

187
Q

●Newton’s first law of motion gives the concept of:—

A

Inertia

188
Q

●The oldest type of energy known to man is:

A

Geothermal energy

189
Q

●Energy that is produced commercially from coal iscalled:—

A

Thermal energy

190
Q

●Water pipes in hilly areas often burst on a cold frostynight because: —

A

water in the pipes freezes and onfreezing water expands, so pipes break

191
Q

●A parachute descends slowly whereas a stonedropped from the same height falls rapidlybecause: —

A

A parachute has a larger surface areaand air resistance is more

192
Q

●In a photocell light energy is converted into:—

A

Electrical energy

193
Q

●An egg sinks in soft water but floats in a concentratedsolution of salt because:—

A

the density of saltsolution exceeds the density of eggs

194
Q

●What should a person on a freely rotating turn tabledo to decrease his (angular) speed?—

A

Spread hishands outwards

195
Q

●Smog is a combination of: —

A

Smoke and fog

196
Q

●The process involved in making soap is: —

A

saponification

197
Q

●Ventilators are provided near the ceiling of the roombecause:—

A

the exhaled warmer air rises up andgoes out

198
Q

●The hair of shaving brush clings together whenremoved from water due to: —

A

Surface Tension

199
Q

●The weakest of all fundamental forces is:—

A

Gravitational Force

200
Q

●Velocity of sound in air does not change with thechange of: —

A

Pressure of air

201
Q

●The cause for the Tsunami, as deduced by theseismologists, is:—

A

deformation of sea floor andvertical displacement of water

202
Q

●Why is it difficult to breathe at higher altitudes?—

A

Due to low pressure

203
Q

●The strongest force in nature is: —

A

Nuclear Force

204
Q

●A person is hurt on kicking a stone due to: —

A

Reaction

205
Q

●It is difficult to cook rice: —

A

at the top of a mountain

206
Q

●What happens when two stones of different massesare dropped simultaneously from the top of abuilding?—

A

Both the stones reach the ground atthe same time

207
Q

●Fog is an example of: —

A

Liquid dispersed in gas

208
Q

●The modulus of rigidity is the ratio of: —

A

Shearingstress due to shearing strain

209
Q

●Heat transfer horizontally within the atmosphere iscalled:—

A

Advection

210
Q

●Angle of friction and angle of repose are:—

A

Equal toeach other

211
Q

●If a boy sitting in a train, which is moving at aconstant velocity, throws a ball straight up into theair, the ball will:—

A

Fall into his hand

212
Q

●Intensity of gravitational field of earth is maximumat:—

A

Poles

213
Q

●The spokes used in the wheel of a bicycle increase its:—

A

Moment of Inertia

214
Q

●A transformer works on the principle of:—

A

MutualInduction

215
Q

●When a ship enters the sea from a river: —

A

It rises alittle

216
Q

●Sea water can be purified by the process of: —

A

Distillation

217
Q

●The centre of gravity of a sprinter during the racelies:—

A

ahead of his feet

218
Q

●A piece of paper and a cricket ball are dropped fromthe same height. Under which of the followingconditions do both reach the surfacesimultaneously?—

A

They must be dropped invacuum

219
Q

●The function of ball bearings in a wheel is:—

A

toconvert kinetic friction into rolling friction

220
Q

●’Shock-absorbers’ are usually made of steel as it:—

A

has higher elasticity

221
Q

●The time period of a seconds pendulum is:—

A

2seconds

222
Q

●Amount of water vapour in the atmosphere ismeasured in terms of: —

A

Humidity

223
Q

●A spherical ball made of steel when dropped inmercury container will:—

A

will be on the surface ofmercury

224
Q

●Vehicle tyres are inflated properly:—

A

to avoidskidding and to minimise friction

225
Q

●Should cars have bumpers that collapse underimpact?—

A

Yes, since they help to absorb theimpact of a collision and keep the occupants safe

226
Q

●Ice cubes are added to a glass of pure water and aglass of pure alcohol. The ice would:—

A

float inalcohol and sink in water

227
Q

●What is the principle of a life jacket?

A

It increases the volume of the person to keep him afloat

228
Q

●A rubber ball is dropped from a height of 2 metres.To what height will it rise, if there is no loss ofenergy/velocity after rebounding?—

A

2 metres

229
Q

●When a pail of water is swung in a vertical circle, thewater does not fall out at the top of the loop whenthe speed is:—

A

Above a certain minimum valueirrespective of amount of water in the pail

230
Q

●Who enunciated the laws of planetary motion?—

A

Johannes Kepler

231
Q

●The radiant energy having lowest energy is:—

A

Microwave radiation

232
Q

●Damp clothes are dried in spin dryers by the actionof:—

A

centrifugal forces

233
Q

●An aircraft can perform aerobatic manoeuvres in avertical loop because of: —

A

Gravity

234
Q

●Sprayer functions on: —

A

Bernoulli’s Principle

235
Q

●The wall of a dam is broader at the base:—

A

towithstand pressure that increases with depth

236
Q

●Which conservation principle is applicable in the caseof the motion of a rocket? —

A

Conservation ofmomentum

237
Q

●It is easier to carry two buckets of water in one handeach, than to carry only one in one hand because:—

A

Centre of gravity and centre of equilibrium fallwithin the feet

238
Q

●The surface tension of water on adding detergent toit:—

A

decreases

239
Q

●In a refrigerator, the cooling system should alwaysbe:—

A

at the bottom

240
Q

●The radiation initially produced in fluorescent tubeis:—

A

Ultraviolet

241
Q

●The ‘four stroke petrol engine’ is based on: —

A

Otto-cycle

242
Q

●In an ordinary glass tube and a glass capillary tubeare both dipped in a beaker of water, water risesin:—

A

both

243
Q

●Small bubbles are perfectly spherical because of:—

A

Surface tension

244
Q

●Two rods, one of copper and other of steel, experiencethe same upthrust when placed in water. Thus,both have:—

A

Equal volume

245
Q

●A single fixed pulley is used to draw water from awell because: —

A

Force is applied in a convenientdirection

246
Q

●The audio signals of TV are: —

A

Frequency modulated

247
Q

●In mirrors, the back surface is coated with a thinlayer of:—

A

Silver

248
Q

●A bomb at rest explodes into a large number of tinyfragments. The total momentum of all thefragments:—

A

is zero

249
Q

●The slope of velocity-time graph represents:—

A

Acceleration

250
Q

●A bullet is fired from a rifle which recoils after firing.The ratio of kinetic energy of the rifle to that ofthe bullet is: —

A

Zero

251
Q

●What happens to a liquid, when the vapour pressureequals the atmospheric pressure? —

A

The liquidboils

252
Q

●Tear gas used by the police to disperse the mobcontains:—

A

Chlorine

253
Q

●Why do birds not have respiratory trouble at the timeof flying at high altitude? —

A

They have extra airsacs

254
Q

●Conversion of heat into electrical form s achieved byusing:—

A

Thermocouple

255
Q

●When milk is churned, the separation of cream fromit takes place by the process of:—

A

centrifugal force

256
Q

●A bottle of soda lime is grasped by the neck andswung briskly in a vertical circle. Near whichportion of the bottle do the bubbles collect? —

A

Near the neck

257
Q

●Water from soil enters into the root hairs owing to:—

A

Capillary pressure

258
Q

●As we go from Equator to North Pole, the value of’g’, the acceleration due to gravity: —

A

increases

259
Q

●Fat can be separated from milk in a cream separatorbecause of: —

A

Centrifugal force

260
Q

●In the Earth, the weight of body is maximum at the:—

A

Surface

261
Q

●Direct conversion of solar energy with the use of aphoto-voltaic cell results in the production of: —

A

Electrical energy

262
Q

●If we want to calculate the pressure of a liquid at thebottom of a vessel, the quantity which is notrequired to determine it, is: —

A

Surface area of thebottom of the vessel

263
Q

●A stone is dropped from the roof of a house towardsthe ground. The kinetic energy of the stone will bemaximum:—

A

Just before it touches the ground

264
Q

A black body can absorb radiations of: —

A

allwavelengths

265
Q

●If we want to calculate the pressure of a liquid at thebottom of a vessel, the quantity which is notrequired to determine it, is: —

A

Surface area of thebottom of the vessel

266
Q

●Optical fibres works on the principle of:—

A

TotalInternal Reflection

267
Q

●An air bubble in water will act like a: —

A

Concavelens

268
Q

●For given incident ray, if a plane mirror is rotatedthrough a certain angle, then the ____ ray rotatesthrough twice of that angle. —

A

Reflected ray

269
Q

●Total Internal Reflection can take place when lighttravels from: —

A

Diamond to glass

270
Q

●An ordinary light bulb has a rather short life becausethe:—

A

Bulb cannot be evacuated completely

271
Q

●An ordinary light bulb has a rather short life becausethe:

A

Wires supporting the filament melt at a hightemperature

272
Q

●If a person looks at a coin which is in a bucket ofwater:—

A

the coin will appear to be closer thanreally is

273
Q

●An image formed on the retina of an eye persists forabout ____ after the removal of stimulus. —

A

0.1seconds

274
Q

●Light is totally reflected when the angle of incidenceexceeds a certain critical value and:

A

light travelling in a denser medium is reflected froma rarer medium

275
Q

●When a CD (compact disc used in audio and videosystems) is seen in sunlight, rainbow like coloursare seen. Thos can be explained on the basis of thephenomenon of:—

A

Refraction, diffraction andtransmission

276
Q

●When light waves pass from air to glass, the variablesaffected are: —

A

Wavelength and velocity

277
Q

●Due to terrestrial heating and ____ of light themirage forms in desert. —

A

Refraction

278
Q

●Diffusion of light in the atmosphere takes place dueto:—

A

Dust particles

279
Q

●The splitting of different colours of light in a prism is:—

A

Dispersion of Light

280
Q

●Optical fibre works on the principle of:—

A

TotalInternal Reflection

281
Q

●The colour of an opaque object is due to the colour it:—

A

reflects

282
Q

●The information of brilliant colours in a thin soapfilm is a consequence of the phenomena of: —

A

Multiple reflection and interference

283
Q

●The basic reason for the extraordinary sparkle ofsuitably cut diamond is that: —

A

it has a very highrefractive index

284
Q

●The speed of light will be minimum while passingthrough:—

A

Glass

285
Q

●An air bubble in water will act like a: —

A

concave lens

286
Q

●Mirage is due to:—

A

unequal heating of different partsof the atmosphere

TRAIN-WAY (27 decks)

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