Waves Test

Result

Waves Test - 84

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Weekly Quiz Competition

Question 1
4 / -1

A tuning fork A produces 4 beats/sec with another tuning fork B of frequency 320 Hz. On filing the fork A, 4 beats/sec are again heard. The frequency of fork A, after filing is

A
324 Hz

B
320 Hz

C
316 Hz

D
314 Hz

Solution
Question 2
4 / -1

The number of beats produced per second by two vibrations: x₁ = x₀ sin 646 πt and x₂ = x₀ sin 652 πt is

A
2

B
3

C
4

D
6

Solution
Question 3
4 / -1

A glass tube 1.5 m long and open at both ends, is immersed vertically in a water tank completely. A tuning fork of 660 Hz is vibrated and kept at the upper end of the tube and the tube is gradually raised out of water. The total number of resonances heard before the tube comes out of water, taking velocity of sound air 330 m/sec is

A
12

B
6

C
8

D
4

Solution
Question 4
4 / -1

If the speed of a wave doubles as it passes from shallow water into deeper water, its wavelength will

A
Unchanged

B
Halved

C
Doubled

D
Quadrupled

Solution
Question 5
4 / -1

A man standing between two parallel hills, claps his hand and hears successive echoes at regular intervals of 1s. If velocity of sound is 340ms^–1, then the distance between the hills is

A
100 m

B
170 m

C
510 m

D
340 m

Solution
Question 6
4 / -1

A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude inside the tube. If the atmospheric pressure ρ_A is ρ_o, then the ratio of maximum and minimum pressure at the dosed end of the tube will be

A

B

C

D

Solution
Question 7
4 / -1

The length of two open organ pipes are 1 and (l +∆l) respectively. Neglecting end correction, the frequency of beats between them will be approximately (Here v is the speed of sound)

A

B

C

D

Solution
Question 8
4 / -1

A tube closed at one end and containing air is excited. It produces the fundamental note of frequency 512 Hz. If the same tube is open at both the ends the fundamental frequency that can be produced is

A
1024 Hz

B
512 Hz

C
256 Hz

D
128 Hz
Question 9
4 / -1

A closed pipe and an open pipe have their first overtones identical in frequency. Their lengths are in the ratio

A
1 : 2

B
2 : 3

C
3 : 4

D
4 : 5

Solution
Question 10
4 / -1

The first overtone in a closed pipe has a frequency

A
Same as the fundamental frequency of an open tube of same length

B
Twice the fundamental frequency of an open tube of same length

C
Same as that of the first overtone of an open tube of same length

D
None of the above

Solution