Physics - General Knowledge Questions and Answers

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Mercury is commonly used as a thermometric fluid rather than water because

specific heat of mercury is less than water

specific heat of mercury is more than water

mercury has greater visibility than water

density of mercury is more than the water

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Optical fibre works on the

principle of refraction

total internal reflection

scattering

interference

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Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

4.2 seconds

42 seconds

4.2 years

42 years

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Supersonic plane fly with the speed

less than the speed of sound

of sound

greater than the speed of sound

of light

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Mach number is used in connection with the speed of

sound

aircraft

spacecraft

ships

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On a stationary sail boat, air is blown from a fan attached to the boat. The boat

moves in opposite direction in which the air is blown

does not move

moves in the same direction in which air blows

spins around

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Rainbow is due to

absorption of sunlight in minute water droplets

diffusion of sunlight through water droplets

ionisation of water deposits

refraction and reflection of sunlight by water droplets

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Stars which appear single to the naked eye but are double when seen through a telescope are

novas and supernovas

binaries

asteroids

quasars

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ML²T^-2 is the dimensional formula for

moment of inertia

pressure

elasticity

couple acting on a body