Physics - Questions (Section-1)
55Mach number is used in connection with the speed of
A. soundB. aircraft
C. spacecraft D. ships
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56ML2T-2 is the dimensional formula for
A. moment of inertiaB. pressure
C. elasticity D. couple acting on a body
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57On 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 blownB. does not move
C. moves in the same direction in which air blows D. spins around
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58Rainbow is due to
A. absorption of sunlight in minute water dropletsB. diffusion of sunlight through water droplets
C. ionisation of water deposits D. refraction and reflection of sunlight by water droplets
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59Stars which appear single to the naked eye but are double when seen through a telescope are
A. novas and supernovasB. binaries
C. asteroids D. quasars
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60Supersonic plane fly with the speed
A. less than the speed of soundB. of sound
C. greater than the speed of sound D. of light
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