Waves Test

Result

Waves Test - 41

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Weekly Quiz Competition

Question 1
4 / -1

Frequency range of the audible sounds is

A
0 Hz – 30 Hz

B
20 Hz – 20 kHz

C
20 kHz – 20,000 kHz

D
20 kHz – 20MHz
Question 2
4 / -1

In a medium sound travels 2 km in 3 sec and in air, it travels 3 km in 10 sec. The ratio of the wavelengths of sound in the two media is

A
1 : 8

B
1 : 18

C
8 : 1

D
20 : 9

Solution
Question 3
4 / -1

A stone is dropped in a well which is 19.6 m deep. Echo sound is heard after 2.06 sec (after dropping) then the velocity of sound is

A
332.6 m/sec

B
326.7 m/sec

C
300.4 m/sec

D
290.5 m/sec

Solution
Question 4
4 / -1

Sound waves transfer

A
Only energy not momentum

B
Energy

C
Momentum

D
Both energy and momentum

Solution
Question 5
4 / -1

At which temperature the speed of sound in hydrogen will be same as that of speed of sound in oxygen at 100°C?

A
–148°C

B
–212.5°C

C
–317.5°C

D
–249.7°C

Solution
Question 6
4 / -1

A tuning fork produces waves in a medium. If the temperature of the medium changes, then which of the following will change?

A
Amplitude

B
Frequency

C
Wavelength

D
Time-period
Question 7
4 / -1

The wavelength of light in visible part (λ_V) and for sound (λ_S) are related as

A
λ_V > λ_S

B
λ_S > λ_V

C
λ_S = λ_V

D
None of these
Question 8
4 / -1

The phase difference between two points separated by lm in a wave of frequency 120 Hz is 90°. The wave velocity is

A
180 m/s

B
240 m/s

C
480 m/s

D
720 m/s

Solution
Question 9
4 / -1

The echo of a gun shot is heard 8 sec. after the gun is fired. How far from him is the surface that reflects the sound ? (velocity of sound in air = 350 m/s)

A
1400 m

B
2800 m

C
700 m

D
350 m

Solution
Question 10
4 / -1

A man sets his watch by the sound of a siren placed at a distance 1 km away. If the velocity of sound is 330 m/s

A
His watch is set 3 sec. faster

B
His watch is set 3 sec. slower

C
His watch is set correctly

D
None of the above

Solution