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.

3,571.

What is the gravitational potential due to a molecule of mass, m and at a distance, r from it? (G = gravitational constant).

A.

Gm2/r2

B.

Gm/r

C.

Gm2/r

D.

G2m2/r

E.

m2/Gr2

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

3,572.

Which of the following is not a property of longitudinal waves?

A.

compression

B.

reflection

C.

refraction

D.

polarization

E.

diffraction

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

3,573.

A string is stretched between two points 50cm apart. It is then plucked at its center and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in 1s.

A.

3

B.

6

C.

150

D.

300

E.

600

View answer & explanation

Correct answer is D

λ = 2 x 50 = 100cm = 1m.
V = fλ, f = v/λ = 300.

3,574.

In a wave the maximum displacement of particles from their equilibrium positions is called.

A.

frequency

B.

amplitude

C.

period

D.

wavelength

E.

wave velocity

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

3,575.

A sound pulse sent vertically downwards into the earth is reflected from two different layers of the earth such that echoes are heard 1.2s and 1.4s. Assuming speed of the pulse is 2000ms-1, calculate the distance between the layers.

A.

200 m

B.

400 m

C.

2400 m

D.

2600 m

E.

2800 m

View answer & explanation

Correct answer is A

X = Δvt/2 = {(2000x14)2 - (2000x12)2} = 200 m.


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