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WAEC questions for "Physics :: Waves"
Q1

The maximum displacement of a vibrating tuning fork is its

A

amplitude

B

frequency

C

period

D

wavelength

E

Waves
Q2

Which of the following waves is not transverse?

A

Light waves

B

sound waves

C

Sea waves

D

E

Waves
Q3

Light traveling through a small pinhole usually does not make a shadow with a distinct sharp edge because of

A

diffraction

B

interfrence

C

reflection

D

refraction

E

Waves
Q4

The angle of incidence of a ray of light on a plane mirror is 55o. Determine the angle between the reflected ray and mirror.

A

35o

B

45o

C

55o

D

110o

E

Waves
Q5

A concave mirror forms a magnified and erect image only when the objects is placed

A

at the center of curvature

B

at the focus

C

between the focus and the pole of the mirror

D

E

Waves
Q6

A thin lens is placed 50 cm from an illuminated object. The image produced has a linear magnification of ¼. Calculate the power of the lens in dioptres.

A

2.5 D

B

5.0 D

C

10.0 D

D

25 .0 D

E

Waves
Q7

Which of the following characteristics of light determines its colour?

A

Velocity

B

Wavelength

C

Amplitude

D

Intensity

E

Waves
Q8

Which of the following is not part of the electromagnetic spectrum?

A

X-rays

B

Microwaves

C

D

Alpha rays

E

Waves
Q9

Sound interference is necessary to produce the phenomenon of

A

beats

B

doppler effect

C

acoustic resonance

D

echo

E

Waves
Q10

Light is considered as a traverse wave because it travels

A

through material without causing  disturbance of the medium

B

through space with constant speed

C

in a direction parallel to the plane containing the electric and magnetic fields

D

in a directional perpendicular to the plane containing the electric and magnetic fields

E

Waves
Q11

The diagram above illustrates the sun, moon and earth in the same straight line during an eclipse. An observer at the point P on earth observes

A

annular eclipse

B

partial eclipse

C

total eclipse

D

no eclipse

E

Waves
Q12

In the day time, it is possible to see under shady areas such as under a tree, because light has undergone

A

internal reflection

B

refraction

C

diffraction

D

diffuse reflection

E

Waves
Q13

The distance between a concave mirror and an object placed in front of it is 1.0m. If the radius of curvature f the mirror is 4.0m, the image formed will be

A

2.00m behind the mirrow

B

2.00m in front of the mirror

C

1.25m in front of the mirror

D

1.25 behind the mirror

E

Waves
Q14

The image formed by a concave mirror is

A

real, erect and enlarged

B

real, inverted and enlarged

C

virtual, erect and diminished

D

virtual, erect and enlarged

E

Waves
Q15

When viewed straight down, a fish in a pond is

A

farther below than it appears to be

B

nearer than it appears to be

C

found at exactly the same point it is seen

D

seen beside its image

E

Waves
Q16

A converging lens and a screen are placed 20cm and 80cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3cm high, calculate the height of the image formed

A

1cm

B

9cm

C

12cm

D

15cm

E

Waves
Q17

Which of the following defects of vision is as a result of the eye ball being too long ?

A

Long sight

B

Astigmatism

C

Short sight

D

Loss of accomodation

E

Waves
Q18

A sound wave is produced from a source and an echo is heard t seconds afterwards. If d is the distance of the reflecting surface from the source v, the speed ζ, the wavelength and ì the period of the wave, then

A

d = 2t/ζ

B

d = ζt/2T

C

d= 2T/ζt

D

d= ζ T/2t

E

Waves
Q19

Which of the following waves is electromagnetic?

A

X - rays

B

Sound waves

C

Water waves

D

Tidal waves

E

Waves
Q20

The distance between two points P and Q, along a wave is 0.05m. If the wave length of the wave is 0.10m, determine the phase angle between P and Q in radians

A

0.1 π

B

π

C

D

10π

E

Waves
Q21

Which of the following phenomena is not a direct consequence of rectilinear propagation of light?

A

Lunar and solar eclipses

B

Images of objects in a pinhole camera

C

Diffraction of light

D

E

Waves
Q22

An object is placed 10cm in front of a plane mirror. If it is moved 8cm farther away from the mirror, determine the distance of the final image from the mirror

A

2cm

B

9cm

C

16cm

D

18cm

E

Waves
Q23

In which of the following pieces of apparatus is the radius of curvature equal to twice the focal length?

A

Converging lens

B

Diverging lens

C

Converging mirror

D

Parabolic mirror

E

Waves
Q24

When an object is placed at the centre of curvature of a concave mirror, its image is formed at

A

the focus

B

infinity

C

the center of curvature

D

a distance twice the radius of curvature

E

Waves
Q25

A rectangular glass prism of thickness d and absolute retractive index n is placed on a point object, which is viewed vertically downward from above the prism. Which of the following expressions correctly defines the apparent upward displacement of the object

A

d/-n

B

dn

C

d/n-2

D

d(n-1)/n

E

Waves
Q26

Which of the following factors can affect the speed of sound in air?

I. The temperature of the surrounding

II. The direction of wind

III. The pitch  of the sound

A

I and II only

B

II and III only

C

I and III only

D

I, II and III

E

Waves
Q27

A sounding tuning fork is brought near the open end of a pipe containing air and the loudness of the sound is observed to increase. This observation is due to

A

an echo

B

resonance

C

interference

D

reverberation

E

Waves
Q28

Which of the following statements about sound waves is not correct? Sound waves can be

A

reflected

B

refracted

C

diffracted

D

polarized

E

Waves
Q29

Which of the following statements is correct about resonance? Resonance occurs when a body

A

vibrates with its natural natural frequency

B

is forced to vibrate at its own natural frequency  by another body vibrating at the same frequency

C

vibrates at the frequency of the body causing the vibration

D

vibrates with an irregular frequency

E

Waves
Q30

The S.I units of frequency, period and amplitude of a wave are respectively

A

hertz, second and centimeter

B

second, metre and hertz

C

metre, hertz and second

D

hertz, second and metre

E

Waves
Q31

A note of frequency 2000Hz has a velocity of 400 ms-1 . Calculate the wavelength of the note

A

5.0m

B

2.0m

C

0.5m

D

0.2m

E

Waves
Q32

The eclipse of the moon occurs when the

A

moon comes exactly between the earth and the sun

B

earth comes exactly between the moon and the sun

C

sun comes exactly between the earth and the moon

D

moon reflects all the rays from the sun onto the earth

E

Waves
Q33

Which of the following observations cannot be explained using the rectilinear propagation of light?

A

Production of images by a pinhole camera

B

Production of real images of objects by lenses

C

Formation of an annular eclipse

D

Diffraction patterns of light

E

Waves
Q34

The distance between the sucessive crests of a wave travelling at 20 ms-1 is 25 cm. Calculate the frequency of the wave

A

0.8Hz

B

5.0Hz

C

50.0Hz

D

80.0Hz

E

Waves
Q35

A ray from a fixed object is incident on a plane mirrow at an angle of 20o . If the mirrow is rotated through 30o , by how many degrees would the reflected ray rotate?

A

60o

B

50o

C

40o

D

30o

E

Waves
Q36

Which of the following distances is usually adjustable in the camera? The distance between the

A

lens the film

B

diaphragm and the shutter

C

shutter and the film

D

diaphragm and the film

E

Waves
Q37

A traveling microscope is focused on a mark on a table. If a glass block of thickness 18.0 cm is placed on the mark, by how many centimeters will the microscope be moved upwards so as to focus the mark once again? [refractive index of glass =1.5]

A

27 cm

B

24 cm

C

9 cm

D

6 cm

E

Waves
Q38

In which of the following media would sound wave travel fastest?

A

Wood

B

Water

C

Iron

D

Mercury

E

Waves
Q39

Which of the following actions is necessary in order to tune a string to produce a note of an octave higher than its fundamental?

A

Doubling the length of the string

B

Reducing the tension by half

C

Reducing the mass per unit length

D

Increasing the tension four times

E

Waves
Q40

Which of the following statements about progressive mechanical wave is correct?

A

it can be plane-polarised

B

its energy is localised at specific points of its profile

C

It does not require a material medium for its propagation

D

its frequency remains constant as it travels between different media

E

Waves
Q41

The distance between two points in phase on a progressive wave is 5cm. If the speed of the wave is 0.20ms-1  , calculate its period .

A

4.00s

B

2.50s

C

0.25s

D

0.04s

E

Waves
Q42

Radio waves travel in air at 3.0 x 108 ms-1. If the waves enter water of refractive index 4/3, calculate the speed of radio waves in water

A

4.33 x 108 ms-1

B

4.00 x 108 ms-1

C

2.25 x 108 ms-1

D

1.33 x 108 ms-1

E

Waves
Q43

The amplitude of a wave is the

A

distance travelled by the wave in a complete cycle of its motion

B

maximum displacement of the wave particle from the equlibrium position

C

separation of two adjacent particles vibrating in a phrase

D

distance between two sucessive troughs of the wave

E

Waves
Q44

Which of the following optical instruments does not depend on the use of plane mirrors?

A

Kaleidoscope

B

Simple microscope

C

Sextant

D

Simple periscope

E

Waves
Q45

A ray of light is incident normally on a plane mirrow. If the incident ray is kept fixed while the mirrow iss rotated through an angle of 30o , determine the initial and final angles of reflection respectively.

A

0o and 60o

B

90o and 30o

C

0o and 30o

D

90o and 60o

E

Waves
Q46

In which of the following media is the transmission of sound waves faster?

A

Vacuum

B

Air

C

Wood

D

Iron

E

Waves
Q47

The basic difference between a transverse wave and a longitudinal wave travelling in the same direction in a medium is in the

A

amplitude of the waves

B

wavelength of the waves

C

direction of vibration of the particles of the medium

D

period of vibration of the particles  of the medium

E

Waves
Q48

A wave traveling from water to glass suffers a change in its speed at athe common boundary. Which of the following properties explains thie observation?

A

Dispersion

B

Refraction

C

Interfrence

D

Diffraction

E

Waves
Q49

The image of an optical pin placed at the principal focus of a concave mirrow will be formed

A

between the principal focus and the pole

B

at the centre of curvature

C

between the principal focus and the centre of curvature

D

at infinity

E

Waves
Q50

A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m, calculate the height of the image of the man produced by the camera

A

0.18 m

B

0.50 m

C

1.62 m

D

18.00 m

E

Waves
Q51

A magnified and virtual image of a near object is produced by

A

prism binoculars

B

astronomical telescope

C

periscope

D

simple microscope

E

Waves
Q52

During a thunderstorm, lightning and thunder occurred simutaneously in the atmosphere. An observer on the earth's surface sees the lighning flash shortly before hearing the thunder. This is because the

A

atmospheric pressure is higher at the surface than at the higher altitudes

B

speed of sound is less than that of light

C

temperature of the atmosphere decreases with altitude

D

atmospheric density decreases with altitude

E

Waves
Q53

A  girl stands 80m away from a tall cliff and blows a whistle. If the speed of sound in air is 330ms-1 , how long would it take for her to hear the echo of the sound?

A

2.062s

B

0.970s

C

0.485s

D

0.242s

E

Waves
Q54

Which of the following reasons explains why the walls and ceillings of a standard concert hall are usually covered with perforated pads? To

A

increasese the intensity of sound waves

B

increase the loudness of the sound waves

C

reduce the effect of reverberation of sound waves

D

decrease the frequency of sound waves

E

Waves
Q55

The sound from a vibrating turning fork is louder when the tip of its stem is placed on a wooden table than when in air because

A

the friction between the table and the turning fork generates additional energy.

B

air molecules absorb sound waves but wood transmits sound waves

C

the table increases the frequency of the turning fork

D

a larger mass of air is set into vibration by the table

E

Waves
Q56

Which of the following conditions is necessary for the occurence of total internal reflection of light?

A

Light must travel from an optically less dense to a denser medium

B

The angle of incidence must be equal to the critical angle

C

The angle of incidence must be greater than the critical angle

D

The angle of refraction must be 90oC

E

Waves
Q57

An object is placed on the principal axis and at the center of curvature of a concave mirror, the image of the object formed by the mirrow is

A

real and magnified

B

real and inverted

C

erect and magnified

D

erect and virtual

E

Waves
Q58

A converging lens produces an image four times as focal lenght

A

100cm

B

33cm

C

29cm

D

20cm

E

Waves
Q59

The horizontal floor of a water reservoir appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.35, calculate the real depth of the reservoir.

A

2.35m

B

1.35m

C

1.00m

D

0.35m

E

Waves
Q60

A converging lens has a focal length of 5cm. Determine its power.

A

+20.0D

B

+0.2D

C

-20.0D

D

-0.2D

E