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.

386.

Which of the following quantities is a vector?

A.

Volume

B.

Momentum

C.

Energy

D.

Speed

Correct answer is B

No explanation has been provided for this answer.

387.

The time rate of increase in velocity is called

A.

force

B.

momentum

C.

acceleration

D.

speed

Correct answer is C

No explanation has been provided for this answer.

388.

A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time? 

A.

1600

B.

1200

C.

200

D.

2400

Correct answer is A

Let the count rate at zero time be N 

N \(\frac{3 min}{\to}\)  \(\frac{N}{2}\) \(\frac{3 min}{\to}\) \(\frac{N}{4}\)

\(\frac{N}{4}\) 

= 400

N = \(\frac{400}{N/4}\) x N 

= 1600

389.

Which of the following pairs is part of the electromagnetic spectrum? 

I. Radio waves

II. sound waves

III. Gamma rays

IV. water waves

A.

I and II

B.

III and IV

C.

I and III

D.

II and IV

Correct answer is C

Examples of electromagnetic waves are radio waves, X-rays, gamma rays, light rays, etc

390.

In which of the following diagrams is the length of the tube equal to one wavelength?

A.

a

B.

b

C.

c

D.

d

Correct answer is C

No explanation has been provided for this answer.