Waves Test

Result

Waves Test - 25

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Weekly Quiz Competition

Question 1
4 / -1

A pipe closed at one end produces a fundamental note of 412 hz. It is cut into two pieces of equal length. The fundamental frequencies produced in the two pieces are

A
206 hz,412 hz

B
824 hz, 1648 hz

C
412 hz, 824 hz

D
206 hz, 824 hz

Solution
Question 2
4 / -1

In a resonance tube, using a tuning fork of frequency 325 hz, two successive resonance lengths are observed as 25.4 cm and 77.4 cm respectively. The velocity of sound in air is

A
338 m/s

B
328 m/s

C
330 m/s

D
320 m/s

Solution
Question 3
4 / -1

A sound source is falling under gravity. At some time t=0, the detector lies vertically below source at a depth H as shown. if v is the velocity of sound and f_ө is frequency of the source, then the apparent frequency recorded after t = 2s is

A

B

C

D

Solution
Question 4
4 / -1

A train has just completed a U-curve in a track which is a semi-circle. The engine is at the forward end of the semi-circular part of the track while the last carriage is at the rear end of the semi circular track. The driver blows a whistle of frequency 200Hz. Velocity of sound is 340m/sec. Then the appearent frequency as observed by a passenger in the middle of the train, when the speed of the train is 30 m/sec is

A
181 Hz

B
200 Hz

C
188 Hz

D
219 Hz
Question 5
4 / -1

Two pulses in a stretched string whose centers are initially 8 cm apart are moving towards each other as shown in Fig. 11.18. The speed of each pulse is 2 cm/s. After 2 seconds the total energy of the pulses will be

A
zero

B
purely Kinetic

C
purely potential

D
partly kinetic × partly potential
Question 6
4 / -1

A sonometer wire resonates with a given tuning fork forming standing waves with five antinodes between the two bridges when a mass of 9 kg is suspended from the wire. When this mass is replaced by mass M, the wire resonates with the same tuning fork forming three antinodes for the same position of bridges. The value of M is

A
25 kg

B
5 kg

C
12.5 kg

D

Solution
Question 7
4 / -1

The displacement y of a wave travelling in x-direction is given by, -4 y= 10 +sin (600t- 2x+ /3) π where x and y are in metre and t is in second. The speed of wave motion in ms^-1 is

A
300

B
600

C
1200

D
200

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

In a stationary wave that forms as a result of reflection of waves from an obstacle, the ratio of the amplitude at an antinode to the amplitude at node is n. The fraction of energy reflection is.

A

B

C

D

Solution
Question 10
4 / -1

A heavy uniform rope hangs vertically from the ceiling, with its lower end free. A disturbance on the rope travelling upwards form the lower end has a velocity v at a distance x from the lower end such that

A
v ∝ x

B

C

D

Solution