Waves Test

Result

Waves Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

Two coherent monochromatic beams of intensities 4I and I respectively are superimposed. The maximum and minimum intensities in the resulting pattern are

A
5I and 3I

B
9I and 3I

C
4I and I

D
9I and I
Question 2
4 / -1

Some of the frequencies of tones produced by an organ pipe are 220, 440, 550, 660 Hz. Find the effective length of the pipe. (take, the speed of sound in air = 330 m/s)

A
1.8 m

B
1.7 m

C
1.5 m

D
1.2 m

Solution
Question 3
4 / -1

Intensity level of sound whose intensity is 10^-8 Wm^-2 is

A
80 dB

B
8 dB

C
4 dB

D
40 dB
Question 4
4 / -1

When two sinusoidal waves moving at right angles to each other superimpose, they produce

A
beats

B
interference

C
stationary waves

D
Lissajous figure
Question 5
4 / -1

A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected with

A
a phase change of 180° with velocity reversed

B
the same phase as the incident pulse with no reversal of velocity

C
a phase change of 180° with no reversal of velocity

D
the same phase as the incident pulse but with velocity reversed
Question 6
4 / -1

The intensity ratio of two waves is 1 : 9. The ratio of their amplitudes, is

A
3 : 1

B
1 : 3

C
1 : 9

D
9 : 1
Question 7
4 / -1

Two progressive waves having equation x₁ = 3 sin ωt and x₂ = 4 sin (ωt – 90° ) are superimposed. The amplitude of the resultant wave is

A
5 unit

B
1 unit

C
3 unit

D
4 unit
Question 8
4 / -1

Two strings with mass per unit length of 9 gcm ^-1 and 25 gcm ^-I are joined together in series. The reflection coefficient for the vibration waves are

A

B

C

D
Question 9
4 / -1

A bus is moving with a velocity of 5 ms ^-1 towards a huge wall. The driver sounds a horn of frequency 165 Hz. If the speed of sound in air is 335 ms ^-1, the number of beats heard per second by a passenger on the bus will be

A
6

B
3

C
5

D
4

Solution
Question 10
4 / -1

Two tuning forks, A and B produce notes of frequencies 258 Hz and 262 Hz. An unknown note sounded with a produces certain beats. When the same note is sounded with B, the beat frequency gets doubled, The unknown frequency is

A
256 Hz

B
254 Hz

C
300 Hz

D
280 Hz