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Home » General Knowledge » Physics Mcqs » Aptitude Test - 2
1.Sound of frequency below 20 Hz is called
A. audio sounds
B. infrasonic
C. ultrasonic
D. audio sounds
2.On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
A. mercury is a metal
B. density of mercury is greater than that of water
C. cohesion of mercury is greater than its adhesion with glass
D. mercury is a metal
3.Suitable impurities are added to a semiconductor depending on its use. This is done in order to
A. increase its life
B. enable it to withstand higher voltages
C. increase its electrical conductivity
D. increase its life
4.Stars twinkle because
A. the intensity of light emitted by them changes with time
B. the distance of the stars from the earth changes with time
C. the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
D. the intensity of light emitted by them changes with time
5.It takes much longer to cook food in the hills than in the plains, because
A. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
B. due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boi
C. in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
D. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
6.Moment of inertia is
A. vector
B. scalar
C. phasor
D. vector
7.. Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'
A. Rainbow
B. Earthshine
C. Halo
D. Rainbow
8.. Inside an aeroplane, flying at a high altitude,
A. the pressure is the same as that outside
B. normal atmospheric pressure is maintained by the use of air pump
C. the pressure inside is less than the pressure outside
D. the pressure is the same as that outside
9.Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
A. Water, iron and air
B. Iron, air and water
C. Air, water and iron
D. Water, iron and air
10.. One thousand microns is equal to
A. 10-3m
B. 10-6m
C. 10-9m
D. 10-3m
11.Sound travels at the fastest speed in
A. steel
B. water
C. air
D. steel
12.oil raise up the wick in a lamp. The principle involves
A. the diffusion of oil through the wick
B. the liquid state of oi
C. capillary action phenomenon
D. the diffusion of oil through the wick
13.. Superconductors are substances which
A. conduct electricity at low temperature
B. offer high resistance to the flow of current
C. offer no resistance to the flow of electricity
D. conduct electricity at low temperature
14. Light travels at the fastest speed in
A. glass
B. water
C. Hydrogen
D. glass
15.Railway tracks are banked on curves
A. necessary centrifugal force may be obtained from the horizontal component weight of the train
B. to avoid frictional force between the tracks and wheels
C. necessary centripetal force may be obtained from the horizontal component of the weight of the train
D. necessary centrifugal force may be obtained from the horizontal component weight of the train
16.On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
A. metals have higher thermal capacity than plastics
B. plastics have a lower density than metals
C. metals are good conductor of heat
D. metals have higher thermal capacity than plastics
17.Intensity of sound at a point is ____ its distance from the source.
A. directly proportional to
B. inversely proportional to
C. directly proportional to square of
D. directly proportional to
18.Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
A. at sea level
B. at the top of Mt. Everest
C. at a place in a valley below sea level
D. at sea level
19.Radio telescopes are better than optical telescopes because
A. they can detect faint galaxies which no optical telescope can
B. they can work even in cloudy conditions
C. they can work during the day and night
D. they can detect faint galaxies which no optical telescope can
20. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
A. X-rays
B. ultraviolet light
C. visible light
D. X-rays
21.Out of the following pairs, which one does not have identical dimension?
A. Moment of inertia and moment of a force
B. Work and Torque
C. Angular momentum and Planck's constant
D. Moment of inertia and moment of a force
22. Mercury is commonly used as a thermometric fluid rather than water because
A. specific heat of mercury is less than water
B. specific heat of mercury is more than water
C. mercury has greater visibility than water
D. specific heat of mercury is less than water
23.Optical fibre works on the
A. principle of refraction
B. total internal reflection
C. scattering
D. principle of refraction
24.Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
A. 4.2 seconds
B. 42 seconds
C. 4.2 years
D. 4.2 seconds
25.Supersonic plane fly with the speed
A. less than the speed of sound
B. of sound
C. greater than the speed of sound
D. less than the speed of sound
26.Mach number is used in connection with the speed of
A. sound
B. aircraft
C. spacecraft
D. sound
27.On a stationary sail boat, air is blown from a fan attached to the boat. The boat
A. moves in opposite direction in which the air is blown
B. does not move
C. moves in the same direction in which air blows
D. moves in opposite direction in which the air is blown
28.. Rainbow is due to
A. absorption of sunlight in minute water droplets
B. diffusion of sunlight through water droplets
C. ionisation of water deposits
D. absorption of sunlight in minute water droplets
29.Stars which appear single to the naked eye but are double when seen through a telescope are
A. novas and supernovas
B. binaries
C. asteroid
D. novas and supernovas
30.ML2T-2 is the dimensional formula for
A. moment of inertia
B. pressure
C. elasticity
D. moment of inertia
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