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.

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3,541.

A concave mirror of radius of curvature 20cm has a pin placed at 15cm from its pole. What will be the magnification of the image formed?

4.00

2.00

1.33

1.50

0.25

View answer & explanation

Correct answer is B

1/U + 1/V = 1/f
f = r/2 = 10cm; 1/15 + 1/v = 1/10
v = 30 = m = v/u = 2

3,542.

A stone is dropped into the middle of a pool of water. Which of the following statements is/are correct?

I. Spherical waves are set up in the water.
II. The water moves outwards to the sides of the pool.
III. Energy is transmitted outwards from the centre of disturbance

I only

II only

III only

I and III only

II and III only

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

3,543.

Which of the following is/are necessary for the production of interference with two wave trains?

I. The sources must be close to each other.
II The waves must have the same frequency.
III. The waves must have the same amplitude.
IV. The waves must travel with the speed of light.

I, II and IV only

I, II and III only

I and II only

II, III and IV only

l, III and IV only

View answer & explanation

Correct answer is B

Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency.

3,544.