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.

4,011.

A ray incident on a glass prism undergoes minimum deviation when the

A.

incident angle is equal to the angle of refraction

B.

refraction angle equals 90o

C.

incident angle equals 90o

D.

incident angle is equal to the angle of emergence

Correct answer is D

At minimum deviation, it is observed that light passes symmetrically through, the prism such that the angle of incidence (io) is angle to the angle of emergency (eo).(i/e Io = eo)

4,012.

The most suitable cell used for short interval switches in electric bells is a

A.

lead- acid accumulator

B.

Daniel cell

C.

Leclanche cell

D.

nickel iron accumulator

Correct answer is C

No explanation has been provided for this answer.

4,013.

Which of the following pairs of light rays show the widest separation in the spectrum of white light

A.

Blue and red

B.

Green and yellow

C.

Indigo and violet

D.

Orange and red

Correct answer is A

From the above diagram the widest separation is given by Blue and red

4,014.

I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel

Which combination of the above makes iron preferable to steel in the making of electromagnets?

A.

I and II only

B.

II and III only

C.

I, III, and IV only

D.

II, III and IV only

Correct answer is D

Iron (soft iron) is usually preferred to steel in the making of electromagnets because it is more easily magnetized and equally more easily demagnetized than [II, III and IV]

4,015.

A magnetic field is said to exist at a point if a force is

A.

exerted on a stationary charge at the point

B.

exerted on a moving charge at the point

C.

deflected at the point

D.

strengthened at the point

Correct answer is B

A charge in motion always experienced a force on entering a magnetic field