Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

2,396.

A balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere

A.

its pressure reduces but volume remains constant

B.

the product of pressure and volume remains constant

C.

both pressure and volume increases

D.

its pressure remains constant but the volume decreases

E.

both pressure and volume remains constant

Correct answer is B

No explanation has been provided for this answer.

2,397.

Two particles X and Y starting from rest cover the same distance. The acceleration of X is twice that of Y. the ratio of the time taken by X to that taken by Y is

A.

\(\frac{1}{2}\)

B.

\(\frac{2}{\sqrt2}\)

C.

\(\frac{1}{\sqrt2}\)

D.

\(\sqrt 2\)

E.

4

Correct answer is C

No explanation has been provided for this answer.

2,398.

Alternating current can induce voltage because it has a

A.

ripple value

B.

varying magnetic field

C.

weaker magnetic field than direct current

D.

stonger magnetic field than direct current

E.

high peak value

Correct answer is B

Due to the change in the voltage in an AC, which either increases or decreases, the magnetic field around it is always either collapsing or expanding (varying magnetic field).

2,399.

A body falls freely under gravity (g = 9.8ms-2) from a height of 40m on to the top of a platform 0.8m above the ground. Its velocity on reaching the platform is

A.

784ms-1

B.

80ms-1

C.

78.4ms-1

D.

39.2ms-1

E.

27.7ms-1

Correct answer is E

No explanation has been provided for this answer.

2,400.

The lack of power of accommodation which is mainly due to the hardening of the eye lens and is usual with onset of old age is called?

A.

myopia

B.

hypermyopia

C.

presbyopia

D.

astigmatism

E.

eye ring

Correct answer is C

No explanation has been provided for this answer.