Waves Test

Result

Waves Test - 42

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Weekly Quiz Competition

Question 1
4 / -1

Velocity of sound in air is

A
Faster in dry air than in moist air

B
Directly proportional to pressure

C
Directly proportional to temperature

D
Independent of pressure of air

Solution
Question 2
4 / -1

Two monatomic ideal gases 1 and 2 of molecular masses m₁ and m₂ respectively are enclosed in separate containers kept at the same temperature. The ratio of the speed of sound in gas 1 to that in gas 2 is given by

A

B

C

D

Solution
Question 3
4 / -1

A
250 m

B
250 √5 m

C
1250 m

D
2500 m

Solution
Question 4
4 / -1

The frequency of a sound wave is n and its velocity is v. If the frequency is increased to 4n, the velocity of the wave will be

A
v

B
2v

C
4v

D
v/4
Question 5
4 / -1

In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.14 second. The frequency of the wave is

A
0.42 Hz

B
2.75 Hz

C
1.79 Hz

D
0.56 Hz

Solution
Question 6
4 / -1

Speed of sound at constant temperature depends on

A
Pressure

B
Density of gas

C
Both (a) and (b)

D
None of the above
Question 7
4 / -1

A man standing on a cliff claps his hand hears its echo after 1 sec. If sound is reflected from another mountain and velocity of sound in air is 340 m/sec. Then the distance between the man and reflection point is

A
680 m

B
340 m

C
85 m

D
170 m

Solution
Question 8
4 / -1

What will be the wave velocity, if the radar gives 54 waves per min and wavelength of the given wave is 10 m?

A
4 m/sec

B
6 m/sec

C
9 m/sec

D
5 m/sec

Solution
Question 9
4 / -1

The minimum distance of reflector surface from the source for listening the echo of sound is

A
28 m

B
18 m

C
19 m

D
16.6 m

Solution
Question 10
4 / -1

Velocity of sound in air
I. Increases with temperature
II. Decreases with temperature
III. Increase with pressure
IV. Is independent of pressure
V. Is independent of temperature
Choose the correct answer

A
Only I and II are true

B
Only I and III are true

C
Only II and III are true

D
Only I and IV are true

Solution