WAEC Past Questions and Answers - Page 4115

20,571.

A ray of light is incident on a glass block as shown in the diagram above. If the reflected and the retracted rays are perpendicular to each other, what is the refractive index of the glass relative to air.?

A.

1.65

B.

1.58

C.

1.52

D.

1.50

E.

1.48

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

20,572.

When a ray of light is incident normally on an air- glass interface, its angle of refraction is

A.

0^o

B.

42^o

C.

45^o

D.

60^o

E.

90^o.

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

20,573.

The graph above shows the relationship between sin i and sin r for a ray of light in air incident on a liquid surface. If i and r are respectively angles of incidence and refraction, deduce the refractive index of the liquid from the graph

A.

1.63

B.

1.50

C.

1.33

D.

1.25

E.

0.08

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

20,574.

The hormone that promotes secondary sexual characteristics in females is

A.

insulin

B.

thyroxin

C.

testosterone

D.

oxytocin

E.

oestrogen

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

20,575.

A boy walks away from a plane mirror at a speed of 3 ms-1 in a direction normal to the surface of the mirror. At what speed is his image approaching him?

A.

89.0ms^-1

B.

6.0ms^-1

C.

4.5ms^-1

D.

1.5ms^-1

E.

0.0ms^-1

View answer & explanation

Correct answer is B

Velocity of image w.r.t boy = velocity of object - velocity of image

velocity w.r.t to boy = v - (-v)

=3.0 - (-3.0)

The image velocity is 6 m/s towards the boy.

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