81.  Write the unit of surface tension in SI system.

A.

B.

C.

D.

Answer : Option B

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82.  Which physical quantity has unit of pascal - second ?

A. Velocity

B. Viscosity

C. Energy

D. Coefficient of viscosity

Answer : Option D

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83.  Which physical quantity has unit of joule - second ?

A. Velocity

B. Plank’s constant

C. Energy

D. viscosity

Answer : Option B

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84.  What is the least count of vernier calipers ?

A.

B.

C.

D.

Answer : Option A

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85.  What is the least count of screw gauge ?

A.

B.

C.

D.

Answer : Option B

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86.  For measurement of astronomical distance ________ is used.

A. vernier calipers

B. spherometer

C. screwgauge

D. indirect method

Answer : Option D

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87.  Which microscope is used to measure the dimension of particle having dimension less than ?

A. electron microscope

B. simple microscope

C. optical microscope

D. none of above

Answer : Option A

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88.  In electron microscope electron behave like ________

A. charge

B. mass

C. particles

D. wave

Answer : Option D

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89.  Which wave length of light is used in an optical microscope ?

A. radiowave

B. X - ray

C. infrared

D. visible

Answer : Option D

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90.  The intercepted area of the spherical surface about the center is having diameter what will be solid angle ?

A.

B.

C.

D.

Answer : Option A

Explanation :


Solid angle

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