General Knowledge - Physics

Exercise :: Physics - Section 1

  • Physics - Section 1
55. 

Supersonic plane fly with the speed

A. less than the speed of sound
B. of sound
C. greater than the speed of sound
D. of light

Answer: Option C

Explanation:

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56. 

Mach number is used in connection with the speed of

A. sound
B. aircraft
C. spacecraft
D. ships

Answer: Option B

Explanation:

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57. 

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. spins around

Answer: Option B

Explanation:

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58. 

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. refraction and reflection of sunlight by water droplets

Answer: Option D

Explanation:

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59. 

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

A. novas and supernovas
B. binaries
C. asteroids
D. quasars

Answer: Option B

Explanation:

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60. 

ML2T-2 is the dimensional formula for

A. moment of inertia
B. pressure
C. elasticity
D. couple acting on a body

Answer: Option D

Explanation:

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