Waves Test

Result

Waves Test - 29

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Weekly Quiz Competition

Question 1
4 / -1

The vibrations of four air columns are represented in Fig. the ratio of frequencies n_p : n_q : n_r : n_s is

A
12 : 6 : 3 : 4

B
1 : 2 : 4 : 3

C
4 : 2 : 3 : 1

D
6 : 2 : 3 : 4

Solution
Question 2
4 / -1

If λ₁ : λ₂ : λ₃ are the wavelengths of the waves giving resonance with the fundamental, first and second overtones respectively of a closed organ pipe, then the ratio of λ₁ : λ₂ : λ₃ is

A
1 : 3 : 5

B
1 : 2 : 3

C
5 : 3 : 1

D

Solution
Question 3
4 / -1

In kundt’s tube, length of an iron rod is 1 m. The stationary waves of frequency 2500 hz are produced in it. The velocity of sound in iron is

A
2500 m/s

B
1250 m/s

C
10000 m/s

D
5000 m/s

Solution
Question 4
4 / -1

A tuning fork of frequency n is sounded at the open end of a long cylindrical tube having a side opening and fitted with a movable reflection piston. On moving the piston through 9 cm, the intensity of sound heard by the listener changes from max. to minimum. If speed of sound is 360 m/s value of n is

A
1000 hz

B
250 hz

C
500 hz

D
750 hz

Solution
Question 5
4 / -1

To an observer moving towards a stationary source, the tone emitted by a source appears to be an octave higher. If V is the speed of sound wave, then the velocity of observer is

A
(2 + V)

B
V/2

C
2V

D
V

Solution
Question 6
4 / -1

A sound source of frequency 170 hz is placed near a wall. A man walking from the source normally towards the wall finds that there is periodic rise and fall of sound intensity. If speed of sound in air is 340 m/se, the distance in metres separating the two adjacent position of minimum intensity is

A
1/2

B
1

C
3/2

D
2

Solution
Question 7
4 / -1

A vehicle, with a horn of frequency n is moving with a velocity of 30 m/s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency (n + n₁). If the sound vel. In air is 300 m/s, then

A
n₁ = 10n

B
n₁ = 0

C
n₁ = 0.1 n

D
n₁ = –0.1 n
Question 8
4 / -1

A racing car moving towards a cliff sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If V = the velocity of sound, the velocity of the car is

A

B
V/2

C
V/3

D
V/4

Solution
Question 9
4 / -1

The stationary wave y = 2 a sin K x cos wt in a closed organ pipe is the result of the superposition of y₁ = a sin(ωt + Kx ) and

A
y₂ = –a cos (ωt + Kx)

B
y₂ = –a cos (ωt - Kx)

C
y₂ = a cos (ωt – Kx)

D
y₂ = a cos (ωt – Kx)

Solution
Question 10
4 / -1

At a certain instant, a stationary transverse wave is found to have maximum kinetic energy. The appearance of the string at that instant is

A

B

C
Sinusoidal shape with amplitude A

D
Straight line