Waves Test

Result

Waves Test - 39

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Weekly Quiz Competition

Question 1
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 velocity ( in ms^–1 ) of a particle at x = 0.25 m at t = 0.5 s is ……

A
0.1 π

B
0.3 π

C
Zero

D
0.3

Solution
Question 2
4 / -1

When two sound waves travel in the same direction in a medium, the displacement of a particle located at x at time t is given by y₁ = 0.05 Cos (0.50πx - 100πt ) & y₂ = 0.05 Cos ( 0.46πx - 92πt ), where y₁, y₂ and x are in meter and t is in seconds.
What is the speed of sound in the medium?

A
332 m/s

B
100 m/s

C
92 m/s

D
200 m/s

Solution
Question 3
4 / -1

When two sound waves travel in the same direction in a medium, the displacement of a particle located at x at time t is given by y₁ = 0.05 Cos (0.50πx - 100πt ) & y₂ = 0.05 Cos ( 0.46πx - 92πt ), where y₁, y₂ and x are in meter and t is in seconds.
How many times per second does an observer hear the sound of maximum intensity?

A
4

B
8

C
12

D
16

Solution
Question 4
4 / -1

When two sound waves travel in the same direction in a medium, the displacement of a particle located at x at time t is given by y₁ = 0.05 Cos (0.50πx - 100πt ) & y₂ = 0.05 Cos ( 0.46πx - 92πt ), where y₁, y₂ and x are in meter and t is in seconds.
At x = 0, how many times between t = 0 and t = 1 s does the resultant displacement become zero?

A
46

B
50

C
92

D
100

Solution
Question 5
4 / -1

A
5 cm

B
10 cm

C
20 cm

D
between 5 cm and 10 cm

Solution
Question 6
4 / -1

A
2 cm

B
4 cm

C
5 cm

D
8 cm
Question 7
4 / -1

The speed of sound in oxygen (O₂) at a certain temperature is 460 ms^–1. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal)

A
500 ms^–1

B
650 ms^–1

C
30 ms^–1

D
1420 ms^–1

Solution
Question 8
4 / -1

The relation between frequency \'n\' wavelength \'λ\' and velocity of propagation ‘v’ of wave is

A
n = vλ

B
n = λ / v

C
n = v / λ

D
n = 1/v
Question 9
4 / -1

Ultrasonic, Infrasonic and audible waves travel through a medium with speeds V_u, V_i and V_a respectively, then

A
V_u, V_i and V_a are nearly equal

B
V_u ≥ V_a ≥V_i

C
V_u ≤ V_a ≤ V_i

D
V_a ≤ V_uand V_u = V_i
Question 10
4 / -1

The distance between two consecutive crests in a wave train produced in a string is 5 cm. If 2 complete waves pass through any point per second, the velocity of the wave is

A
10 cm/sec

B
2.5 cm/sec

C
5 cm/sec

D
15 cm/sec

Solution