Waves Test

Result

Waves Test - 33

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Weekly Quiz Competition

Question 1
4 / -1

Twenty four tuning forks are arranged in such a way that each fork produces 6 beats/s with the preceding fork. If the frequency of the last tuning fork is double than the first fork, then the frequency of the second tuning fork is ………

A
132

B
138

C
276

D
144

Solution
Question 2
4 / -1

The wave number for a wave having wavelength 0.005 m is …….. m^–1.

A
5

B
50

C
100

D
200

Solution
Question 3
4 / -1

An listener is moving towards a stationary source of sound with a speed ¼ times the speed of sound. What will be the percentage increase in the frequency of sound heard by the listener?

A
20%

B
25%

C
2.5%

D
5%

Solution
Question 4
4 / -1

When the resonance tube experiment, to measure speed of sound is performed in winter, the first harmonic is obtained for 16 cm length of air column. If the same experiment is performed in summer, the second harmonic is obtained for x length of air column. Then ….

A
32 > x > 16

B
16 > x

C
x > 48

D
48 > x > 32

Solution
Question 5
4 / -1

What should be the speed of a source of sound moving towards a stationary listener, so that the frequency of sound heard by the listener is double the frequency of sound produced by the source? { Speed of sound wave is v }

A
v

B
2v

C
v/2

D
v/4

Solution
Question 6
4 / -1

A metal wire having linear mass density 10 g/m is passed over two supports separated by a distance of 1 m. The wire is kept in tension by suspending a 10 kg mass. The mid point of the wire passes through a magnetic field provided by magnets and an a.c. supply having frequency n is passed through the wire. If the wire starts vibrating with its resonant frequency, what is the frequency of a.c. supply?

A
50 Hz

B
100 Hz

C
200 Hz

D
25 Hz

Solution
Question 7
4 / -1

If the listener and the source of sound moves along the same direction with the same speed, then……..

A

B

C

D

Solution
Question 8
4 / -1

A wire of length 10 m and mass 3 kg is suspended from a rigid support. The wire has uniform cross sectional area. Now a block of mass 1 kg is suspended at the free end of the wire and a wave having wavelength 0.05 m is produced at the lower end of the wire. What will be the wavelength of this wave when it reached the upper end of the wire?

A
0.12 m

B
0.18 m

C
0.14 m

D
0.10 m

Solution
Question 9
4 / -1

If the mass of 1 mole of air is 29 × 10^–3 kg, then the speed of sound in it at STP is …….. ( ã = 7/5). { T = 273 K, P = 1.01 × 10⁵ Pa }

A
270 m/s

B
290 m/s

C
330 m/s

D
350 m/s

Solution
Question 10
4 / -1

A wave travelling along a string is described by y = 0.005 Sin (40x – 2t) in SI units. The wavelength and frequency of the wave are………

A
(π/5) ; 0.12 Hz

B
(π/10) m; 0.24 Hz

C
(π/40) m; 0.48 Hz

D
(π/20) m; 0.32 Hz

Solution