GK-Physics Question and Answer
GK-Physics Question and Answer
51. Out of the following pairs, which one does not have identical dimension?
- Moment of inertia and moment of a force
- Work and Torque
- Angular momentum and Planck's constant
- Impulse and Momentum
52. 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
53. Optical fibre works on the
- principle of refraction
- total internal reflection
- scattering
- interference
54. 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
55. Supersonic plane fly with the speed
- less than the speed of sound
- of sound
- greater than the speed of sound
- of light
57. 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
58. 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
59. Stars which appear single to the naked eye but are double when seen through a telescope are
- novas and supernovas
- binaries
- asteroids
- quasars
60. Solar eclipse will take place when
- the sun is between the moon and the earth
- the earth is between the moon and the sun
- the moon is between the sun and the earth
- the moon does not lie on the line joining the sun and the earth