Question Library — KalmiPrep by Kalmitech

Physics WAEC / WASSCE 1992 Waves and Optics

A ray of light strikes a plane mirror at an angle of incidence i. Determine in terms of i the angle of deviation of the ray after reflection from the mirror.

A

i

B

2i

C

90o-i

D

90o+ i

E

180o - 2i

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

Images formed by a convex mirror are always

A

inverted, real and diminished

B

inverted, virtual and diminished

C

erect, virtual and diminished

D

erect, real and magnified

E

erect, virtual and magnified

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

Which of the following statements is not correct for a light ray passing through a rectangular glass block which is surrounded by air? It

A

suffers a displacement at the point of emergence

B

emerges parallel to the incident ray

C

is partly reflected at the point of incidence

D

is deviated at the point of emergence

E

is reflected in the block

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 ms-1)

A

36.67m

B

74.25m

C

148.50m

D

297.00

E

366.67m

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

Which of the following waves are longitudinal waves? l. Ripples on the surface of water II. Waves produced by a tuning fork vibrating in air III. Light waves IV. Waves produced by a flute

A

I and II only

B

I and III only

C

II and III only

D

II and IV only

E

III and IV only

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

Which of the following statements is not true?

A

Musical notes consist of the combination of sounds of regular frequency

B

The combination of overtones produced by an instrument determines the quality of the sound

C

the loudness of sound is determined by its frequency

D

the pitch of a note depends on the frequency of vibration of the source

E

Noise can be produced by a combination of sounds of irregular frequency

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.5om. What is the distance between the lenses?

A

20.0cm

B

47.5cm

C

50.0cm

D

52.5cm

E

125.0cm.

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

Which of the following is used for controlling the amount of light entering the eye?

A

Cornea

B

Pupil

C

Iris

D

Optic nerve

E

Ciliary muscle

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

The angle of deviation of light of various colours passing through a glass prism decreases in the order of

A

blue orange and red

B

red, blue and orange

C

blue, red and orange

D

red, orange and blue

E

orange, blue and red

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

In an experiment to measure1 the focal length f of a converging lens object distances u and corresponding image distance were measured and 1/u plotted against 1/v to obtain the graph illustrated. How would f be determined from this graph?

Attached Figure / Diagram

A

f= the slope of the graph

B

f= the intercept on the 1/u axis

C

f =the intercept on the 1/v axis

D

f = reciprocal of the slope

E

f = reciprocal of the intercept on either axes

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

The image of a pin formed by a diverging lens of focal length 10cm is 5cm from the lens. Calculate the distance of the pin from the lens

A

-3.3cm

B

3.3cm

C

10.0cm

D

15.0cm

E

20.0cm

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

As an object is moved close to the focus of a converging lens from infinity its image I. moves closer to the lens II. moves away from the lens. III. Remains the same size. IV becomes smaller. Which of the statements above is/are correct?

A

III and IV only

B

I and III only

C

IV only

D

III only

E

II only

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

A real image of an object fom1ed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?

A

30cm

B

25cm

C

20cm

D

15cm

E

10cm

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

The eye defect illustrated in the diagram above can be corrected by a

Attached Figure / Diagram

A

convex mirror

B

concave mirror

C

diverging lens

D

converging lens

E

piano-converging lens

medium Difficulty

Physics WAEC / WASSCE 1992 Waves and Optics

lf the frequency of the a.c. circuit illustrated is 500Hz/ π what would be the reactance in the circuit?

Attached Figure / Diagram

A

0.01Ω

B

190.91 Ω

C

200.00 Ω

D

795.46 Ω

E

1000.00Ω

medium Difficulty