Waves Test

Result

Waves Test - 40

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m/s, then wavelength of the tone emitted is

A
0.56 m

B
0.89 m

C
1.11 m

D
1.29 m

Solution
Question 2
4 / -1

A man sets his watch by a whistle that is 2 km away. How much will his watch be in error? (speed of sound in air 330 m/sec)

A
3 seconds fast

B
3 seconds slow

C
6 seconds fast

D
6 seconds slow

Solution
Question 3
4 / -1

Angle between wave velocity and particle velocity of a longitudinal wave is

A
90°

B
60°

C
0°

D
120°
Question 4
4 / -1

Velocity of sound waves in air is 330 m/sec. For a particular sound in air, a path difference of 40 cm is equivalent to a phase difference of 1.6π. The frequency of this wave is

A
165 Hz

B
150 Hz

C
660 Hz

D
330 Hz

Solution
Question 5
4 / -1

The wavelength of ultrasonic waves in air is of the order of

A
5 × 10^–1 cm

B
5 × 10^–3 cm

C
5 × 10¹ cm

D
5 × 10³ cm

Solution
Question 6
4 / -1

The relation between phase difference (∆ɸ) and path difference (∆x) is

A

B

C

D
Question 7
4 / -1

A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 MHz. The speed of sound in a tissue is 1.7 km – s^–1. The wavelength of sound in the tissue is close to

A
4 × 10^–4 m

B
8 × 10^–3 m

C
4 × 10^–3 m

D
8 × 10^–4 m

Solution
Question 8
4 / -1

The minimum audible wavelength at room temperature is about

A
0.2 Å

B
5 Å

C
5 cm to 2 metre

D
20 mm

Solution
Question 9
4 / -1

The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300 K is

A

B

C

D

Solution
Question 10
4 / -1

The number of waves contained in unit length of the medium is called

A
Elastic wave

B
Wave number

C
Wave pulse

D
Electromagnetic wave

Solution