Waves Test

Result

Waves Test - 38

Score
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Rank
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Weekly Quiz Competition

Question 1
4 / -1

Statement – 1: When a sound source moves towards observer, then frequency of sound increases.
Statement – 2 : Wavelength of sound in a medium moving towards the observer decreases

A
Statement – 1 is true, statement- 2 is true; statement-2 is the correct explanation of statement – 1 .

B
Statement – 1 is true, statement- 2 is true but statement-2 is not the correct explanation of statement – 1 .

C
Statement – 1 is true, statement- 2 is false

D
Statement – 1 is false, statement- 2 is true
Question 2
4 / -1

Statement – 1: Newton’s equation for speed of sound was found wrong because he assumed the process to be isothermal.
Statement – 2 : When sound propagates, the compression\'s and rarefaction happen so rapidly that there is not enough time for heat to be distributed.

A
Statement – 1 is true, statement- 2 is true; statement-2 is the correct explanation of statement – 1 .

B
Statement – 1 is true, statement- 2 is true but statement-2 is not the correct explanation of statement – 1 .

C
Statement – 1 is true, statement- 2 is false

D
Statement – 1 is false, statement- 2 is true
Question 3
4 / -1

Statement – 1 : When pressure in a gas changes, velocity of sound in gas may change.
Statement – 2 : Velocity of sound is directly proportional to square root of pressure.

A
Statement – 1 is true, statement- 2 is true; statement-2 is the correct explanation of statement – 1 .

B
Statement – 1 is true, statement- 2 is true but statement-2 is not the correct explanation of statement – 1 .

C
Statement – 1 is true, statement- 2 is false

D
Statement – 1 is false, statement- 2 is true
Question 4
4 / -1

Statement – 1 : If wave enters from one medium to another medium then sum of amplitudes of reflected wave and transmitted wave is equal to the amplitude of incident wave.
Statement – 2 : If wave enters from one medium to another medium some part of energy is transmitted and rest of the energy is reflected back.

A
Statement – 1 is true, statement- 2 is true; statement-2 is the correct explanation of statement – 1 .

B
Statement – 1 is true, statement- 2 is true but statement-2 is not the correct explanation of statement – 1 .

C
Statement – 1 is true, statement- 2 is false

D
Statement – 1 is false, statement- 2 is true
Question 5
4 / -1

A string 25 cm long and having a mass of 2.5 g is under tension. A pipe closed at one end is 40 cm long. When the string is set vibrating in its first overtone and the air in the pipe in its fundamental frequency, 8 beats per second is heard. It is observed that decreasing the tension in the string decreases the beat frequency. The speed of sound in air is 320 ms^{– 1} .
The frequency of the fundamental mode of the closed pipe is ….. Hz

A
100

B
200

C
300

D
400
Question 6
4 / -1

A string 25 cm long and having a mass of 2.5 g is under tension. A pipe closed at one end is 40 cm long. When the string is set vibrating in its first overtone and the air in the pipe in its fundamental frequency, 8 beats per second is heard. It is observed that decreasing the tension in the string decreases the beat frequency. The speed of sound in air is 320 ms^{– 1}.
The frequency of the string vibrating in its 1st overtone is …… Hz

A
92

B
108

C
192

D
208

Solution
Question 7
4 / -1

string 25 cm long and having a mass of 2.5 g is under tension. A pipe closed at one end is 40 cm long. When the string is set vibrating in its first overtone and the air in the pipe in its fundamental frequency, 8 beats per second is heard. It is observed that decreasing the tension in the string decreases the beat frequency. The speed of sound in air is 320 ms^{– 1}.
The tension in the string is very nearly equal to ……

A
25N

B
27 N

C
28 N

D
30N

Solution
Question 8
4 / -1

Standing waves are produced by the superposition of two waves y₁ = 0.05 Sin(3πt – 2x) and y₂ = 0.05 Sin(3πt + 2x) where x and y are in meters and t is in seconds.
The speed ( in ms^{– 1} ) of each wave is ……

A
1.5

B
3.0

C
3π/2

D
3π

Solution
Question 9
4 / -1

Standing waves are produced by the superposition of two waves y₁ = 0.05 Sin(3πt – 2x) and y₂ = 0.05 Sin(3πt + 2x) where x and y are in meters and t is in seconds.
The distance ( in meters ) between two consecutive nodes is …….

A
π/2

B
π

C
0.5

D
1.0

Solution
Question 10
4 / -1

Standing waves are produced by the superposition of two waves y₁ = 0.05 Sin(3πt – 2x) and y₂ = 0.05 Sin(3πt + 2x) where x and y are in meters and t is in seconds.
The amplitude of a particle at x = 0.5 m is ……

A
1.08 × 10^–1 m

B
5.4 × 10^–2 m

C
(π/2) × 10^–1 m

D
π × 10^–1 m

Solution