Free Printable Physics Evaluation Test: Waves and Light

1.

The distance covered by a wave in one cycle is called

a)

Amplitude

b)

. frequency

c)

period

d)

wavelength

2.

The following are properties of wave.

I. Polarization II. Refraction III. Diffraction

Which of them is/are exhibited by both transverse and longitudinal waves?

a)

I only

b)

II only

c)

I and III only

d)

II and III only

3.

A ray of light is incident at 32⁰to a plane surface. Calculate the angle of deviation of the ray.

a)

32⁰

b)

58⁰

c)

116⁰

d)

148⁰

4.

A concave mirror has a focal length of 15 cm. Calculate its radius of curvature.

a)

1.0 cm

b)

30 cm

c)

15.0 cm

d)

7.5 cm

5.

A measuring cylinder has a depth of 4.2 cm when filled with a liquid. A coin dropped inside it appears to be at a depth of 3.5 cm when viewed from above. Calculate the refractive index of the liquid.

a)

1.20

b)

1.83

c)

1.89

d)

0.70

6.

The following are sets of components of electromagnetic spectrum. Which of them is arranged in order of increasing wavelength?

a)

Gamma rays, X-rays, ultraviolet rays and light rays

b)

Infrared rays, gamma rays, microwaves and radio waves

c)

Light waves, microwaves, radio waves and infrared waves

d)

X-rays, ultraviolet rays, light rays and gamma rays

7.

The part of human eye that focuses rays entering the eye is

a)

Blind spot

b)

iris

c)

eye lens

d)

retina

8.

Which of the characteristics of sound below is/are NOT correctly matched with factor affecting it?

I. Pitch with amplitude

II. Loudness with frequency

III. Quality with overtones

a)

I only

b)

II only

c)

I and II only

d)

II and III only

9.

A plucked string of length 1.2 m produced a note of frequency 150 Hz. Calculate its length that will produce a note of frequency 75 Hz.

a)

0.6 m

b)

1.2 m

c)

2.0 m

d)

2.4 m

10.

A ship sent out sound into sea and received the echo 5 seconds later. Calculate the depth of the sea. ( Velocity of sound in sea water = 1500 m/s)

a)

3750 m

b)

7500 m

c)

1500 m

d)

600 m

11.

A stationary wave is formed when two progressive waves of equal amplitude and frequency traveling in opposite direction are

a)

Diffracted

b)

polarized

c)

superimposed

d)

reflected

12.

Which of the following materials is translucent?

a)

Mirror

b)

Sheet of iron

c)

tracing paper

d)

wood

13.

At what angle to each other will two mirrors be placed to produce three images?

a)

30⁰

b)

45⁰

c)

60⁰

d)

90⁰

14.

A pin placed under a glass rectangular glass block appeared to be 3 cm below its surface when viewed directly from above. Calculate the thickness of the glass block.

(Refractive index of glass =3/2)

a)

9.0 cm

b)

2.0 cm

c)

3.7 cm

d)

4.5 cm

15.

Which of the following statements is correct about electromagnetic waves? They

a)

Are longitudinal waves

b)

Can be polarized

c)

Have the same wavelength

d)

Require material medium for their propagation

16.

Speed of sound varies with

I. the medium II. Temperature III. Pressure

Which of the above statements is/are correct?

a)

II only

b)

III only

c)

II and III only

d)

I and II only

17.

A ship echo sounder sent out ultrasonic sound at two different points and received the echo after 4s and 7s. Calculate the difference between the depths of the sea at both points. (Speed of sound in water =1500 m/s)

a)

600 m

b)

2250 m

c)

5350 m

d)

4500 m

18.

Waves in which the displacement of particles is at right angles to the direction of travel of the waves are called

a)

sound waves

b)

transverse waves

c)

ultrasonic waves

d)

longitudinal waves

19.

A converging lens which has a focal length of 10 cm forms a virtual image 20 cm from the lens. Calculate the distance of the object from the lens.

a)

7.6 cm

b)

6.7 cm

c)

5.5 cm

d)

3.1 cm

20.

In order to determine the depth of a sea, a ship sends ultrasound wave pulses to the sea bed. The reflected pulses are received 0.15 s later. Determine the depth of the sea. (Speed of ultrasound in water= 1500 m/s)

a)

450.0 m

b)

225.0 m

c)

112.5 m

d)

337.5 m

21.

The principle of operation of optical fibre is

a)

Diffraction

b)

interference

c)

total internal reflection

d)

polarization

22.

A high frequency sound that cannot be detected by the human ear is called

a)

Ultrasound

b)

treble sound

c)

octave sound

d)

bass sound

23.

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

a)

Red and blue

b)

Orange and green

c)

Red and indigo

d)

Violet and green

24.

A man at the back of a crowd watches a parade by holding a plane mirror just above his head. The parade passes 6 m behind his head and the mirror is 0.25 m in front of the man. How far does the image in the mirror appear to be from the man?

a)

6.78 m

b)

6.25 m

c)

5.57 m

d)

6.00 m

25.

A wave travels a distance of 20 cm in 3 s. The distance between successive crests of the wave is 4 cm. What is the frequency of the wave?

a)

0.60 Hz

b)

7.50 Hz

c)

15.00 Hz

d)

1.67 Hz

26.

A man standing 510 m away from a wall sounds a whistle. The echo from the wall reaches him 3 s later. Calculate the velocity of sound in air.

a)

170 m/s

b)

340 m/s

c)

680 m/s

d)

1530 m/s

27.

Given that the equation of a progressive wave is give by: y= 5 sin ( 2000πt – 0.4 x) Calculate the wavelength. (π =3.14)

a)

12.4 m

b)

15.7 m

c)

17.5 m

d)

18.6 m

28.

Total internal reflection of light occurs when light travels from

a)

less dense to a denser

b)

air to water

c)

water to air

d)

none of the above

29.

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

a)

kaleidoscope

b)

simple microscope

c)

sextant device

d)

simple periscope

30.

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

a)

Interference

b)

Dispersion

c)

Refraction

d)

Diffraction

31.

A radio wave has a wavelength of 150 m. If the velocity of radio wave in free space is 3 X 10⁸m/s, calculate the frequency of the radio wave.

a)

4.5 X10⁶ Hz

b)

3.9 X10¹⁰ Hz

c)

2.0X10⁶Hz

d)

2.0X10⁸ Hz

32.

A wave is represented by equation
y= 0.5 sin 0.4 $\pi$ (x-60t),
where x is measured in cm and t in s. Compute the value of wavelength.

a)

0.2 cm

b)

0.5 cm

c)

2.0 cm

d)

5.0 cm

33.

An electromagnetic wave of frequency 5.0 X10¹⁴ Hz is incident on the surface of water of refractive index 4/3. Calculate the wavelength of the wave in water. (Speed of the wave is 3X10⁸ m/s)

a)

4.5X10^-7m

b)

2.2X10^-6m

c)

2.25 X10^-7m

d)

1.7X10^-6m

34.

A concave mirror can be used to produce a parallel beam of light if a light bulb is placed

a)

between its focus and the pole

b)

at its focus

c)

at its centre of curvature

d)

between its focus ad curvature

35.

Which of the following properties of waves is exclusive to transverse waves?

a)

Refraction

b)

Interference

c)

Polarization

d)

diffraction

36.

Surface waves travelling in deep water at 15m/s are incident of a shallow water boundary. If the angles of incident and refraction are 45⁰ and 30⁰ respectively, calculate the speed of the waves in shallow water

a)

8.1m/s

b)

10.0m/s

c)

22.5m/s

d)

10.6m/s

37.

An object 20 cm from a convex lens has its image produced 25 cm away. Calculate the power of the lens.

a)

-9.0 D

b)

+9.0 D

c)

+5.0 D

d)

+10.0 D

38.

Which of the following pairs are both wind instruments?

a)

Bell and Saxophone

b)

Gong and guitar

c)

Flute and piano

d)

Clarinet and Trumpet

39.

In a compound microscope, the purpose of objective lens is to form

a)

Real, inverted and diminished image

b)

Virtual, upright and magnified image

c)

Real, inverted and magnified image

d)

Real, upright and diminished image

40.

An person can focus and object only when it is within 100 cm from him. What type of spectacle should be used to increase the distance of distinct vision to infinity?

a)

Cylindrical glasses

b)

Binocular glasses

c)

Concave glasses

d)

Convex glasses

41.

A normal person can hear sounds with frequencies that lie between

a)

10 Hz and 10kHz

b)

20 Hz and 20 KHz

c)

20 Hz and 2000 KHz

d)

30 Hz and 200Hz

42.

Which of the following quantities can be used to distinguish noise from music?

a)

Temperature

b)

Frequency

c)

Velocity

d)

Amplitude

43.

The three major factors that determine the frequency of a vibrating string are

a)

Length, tension and thickness

b)

Length, thickness and size

c)

Thickness, tension and size

d)

Mass, length and tension

44.

In order to see distant objects, such as dim Stars, which of the devices below is suitable?

a)

Compound microscope

b)

Simple microscope

c)

Telescope

d)

Periscope

45.

The distance between the eye and its near point is called

a)

Least distance of vision

b)

Last distance of distinct vision

c)

Least distance of distinct vision

d)

Normal vision distance.

Physics Evaluation Test: Waves and Light

Total questions: 45

Worksheet time: 2hrs 30mins

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