WAEC Physics Past Questions & Answers - Page 299

1,491.

The diagram above shows an incident ray A, inclined at angle of 50o to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?

A.

sin50o/sin40o

B.

sin40osin50o

C.

sin90o/sin50o

D.

sin40o/sin90o

E.

sin90o/sin40o

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

1,492.

A parallel beam of light is to be obtained from the headlamp ofa car. At which of the following positions should the source of light be placed from the pole of its spherical minor?

A.

At the focal point

B.

At the centre of curvature

C.

Beyond the centre of curvature

D.

Between the focal point and the pole

E.

Between the focal point and the center of curvature

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,493.

Where will the image of the object OB shown in the diagram above be located after reflection from the mirror?

A.

At F

B.

Beyond C

C.

Between O and P

D.

Between P and F

E.

Between F and C

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,494.

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?

A.

4.00

B.

2.00

C.

1.33

D.

1.50

E.

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

1,495.

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

A.

I only

B.

II only

C.

III only

D.

I and III only

E.

II and III only

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.


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