Waves Test

Result

Waves Test - 72

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Weekly Quiz Competition

Question 1
4 / -1

A train has just completed a U-curve in a track which is a semicircle. 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 semicircular track. The driver blows a whistle of frequency 200 Hz. Velocity of sound is 340 m/sec. Then the apparent frequency as observed by a passenger in the middle of a train when the speed of the train is 30 m/sec is

A
209 Hz

B
288 Hz

C
200 Hz

D
181 Hz

Solution
Question 2
4 / -1

Two identical flutes produce fundamental notes of frequency 300 Hz at 27°C. If the temperature of air in one flute is increased to 31°C, the number of the beats heard per second will be

A
1

B
2

C
3

D
4

Solution
Question 3
4 / -1

In the experiment for the determination of the speed of sound in air using the resonance column method, the length of the air column that resonates in the fundamental mode, with a tuning fork is 0.1 m. When this length is changed to 0.35 m, the same tuning fork resonates with the first overtone. Calculate the end correction

A
0.012 m

B
0.025m

C
0.05 m

D
0.024m

Solution
Question 4
4 / -1

A closed organ pipe of length L and an open organ pipe contain gases of densities ρ₁ and ρ₂ respectively. The compressibility of gases are equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency. The length of the open organ pipe is

A

B

C

D

Solution
Question 5
4 / -1

A string of length 0.4 m and mass 10^–2 kg is tightly clamped at its ends. The tension in the string is 1.6 N. Identical wave pulses are produced at one end at equal intervals of time ∆t. The minimum value of ∆t which allows constructive interference between successive pulses is

A
0.05 s

B
0.10 s

C
0.20 s

D
0.40 s

Solution
Question 6
4 / -1

Two identical stringed instruments have frequency 100 Hz. If tension in one of them is increased by 4% and they are sounded together then the number of beats in one second is

A
1

B
8

C
4

D
2

Solution
Question 7
4 / -1

The difference between the apparent frequency of a source of sound as perceived by an observer during its approach and recession is 2% of the natural frequency of the source. If the velocity of sound in air is 300 m/sec, the velocity of the source is (It is given that velocity of source < < velocity of sound)

A
6 m/sec

B
3 m/sec

C
1.5 m/sec

D
12 m/sec

Solution
Question 8
4 / -1

A plane EM wave of frequency 30 MHz travels in free space along the x-direction. The electric field component of the wave at a particular point of space and time E = 6V/m along y-direction. Its magnetic field component B at this point would be

A
2 × 10^–8 T along z-direction

B
6 × 10^–6 T along x-direction

C
2 × 10^–8 T along y-direction

D
6 × 10^–8 T along z-direction

Solution
Question 9
4 / -1

Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72 km/hr and 36 km/hr. If first car blows horn of frequency 280 Hz, then the frequency of horn heard by the driver of second car when line joining the cars make 45° angle with the roads; will be

A
321 Hz

B
298 Hz

C
289 Hz

D
280 Hz

Solution
Question 10
4 / -1

Two whistles A and B produce notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the mid-point of the line joining them. Now the whistle B and the listener start moving with speed 30 m/s away from the whistle A. If speed of sound be 330 m/s, how many beats will be heard by the listener?

A
2

B
4

C
6

D
8

Solution