Physics - Questions and Answers, General Study (GK)

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141.

When the terminal velocity is reached, the acceleration of a body moving through a viscous medium is

(a)negative

(b)positive

(c)zero

(d)none of these

Comment

Answer is: CNA

142.

The terminal velocity of a small sized spherical body of radius 'r' falling in a viscous liquid is proportional to

(a)1/r²

(b)1/r

(c)r²

(d)r

Comment

Answer is: CNA

143.

A small and a large rain drops are falling through air

(a)the small drop moves faster

(b)the large drop moves faster

(c)both moves with same speed

(d)none of the above

Comment

Answer is: CNA

144.

A small drop falls from rest from a large height 'h' in air the final velocity is

(a)almost independent of 'h'

(b)directly proportional to 'h'

(c)inversely proportional to 'h'

(d)directly proportional to 'h²'

Comment

Answer is: ANA

145.

Dynamic lift is related to

(a)equation of continuity

(b)Pascal law

(c)Archimedes principle

(d)Bernoulli theorem

Comment

Answer is: DNA

146.

The velocity of flow of liquid through an orifice at the bottom of a tank depends on the

(a)height of the liquid above the orifice

(b)acceleration due to gravity

(c)area of the cross-section of the orifice

(d)Both (a) and (b)

Comment

Answer is: DNA

147.

Consider the following statements
1. The viscosity of a gas increases with rise in temperature.
2. The viscosity of the liquid falls very rapidly with rise in temperature.
Which of the statement (s) given above is/are correct?

(a)only 1

(b)only 2

(c)Both 1 and 2

(d)Neither 1 nor 2

Comment

Answer is: CNA

148.

The Young's modulus for perfectly rigid body is

(a)zero

(b)1

(c)infinite

(d)none of these

Comment

Answer is: CNA

149.

The modulus of rigidity of a liquid is

(a)zero

(b)infinite

(d)none of these

Comment

Answer is: ANA

150.

Which is more elastic?

(a)Aluminium

(b)Copper

(c)Iron

(d)Glass

Comment

Answer is: CNA

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Physics - Questions and AnswersPage 15

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