Waves Test

Result

Waves Test - 24

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Weekly Quiz Competition

Question 1
4 / -1

A

B
λ= 2π y₀

C
λ = π/y₀

D
λ = πy₀/2

Solution
Question 2
4 / -1

If the intensities of two interfering waves be I₁ and I₂, the contrast between maximum and minimum intensity is maximum, when

A
I₁ >> I₂

B
I₁ < < I₂

C
I₁ = I₂

D
Either I₁ or I₂ is zero
Question 3
4 / -1

Two vibrating tuning forks produce progressive waves given by y₁ = 4 sin 500 π t, y₂ = 2 sin 506 π t and held near the ear of a person. Number of beats heard per minute is

A
180

B
3

C
360

D
60

Solution
Question 4
4 / -1

Two mutually perpendicular simple harmonics vibration have same amplitude, frequency and phase. When they superimpose, the resultant form of vibration will be

A
A circle

B
An ellipse

C
A straight line

D
A parabola
Question 5
4 / -1

Beats are produced by two travelling waves each of loudness I and nearly equal frequencies n₁ and n₂. The beat frequency will be … and maximum loudness heard will be….

A
(n₁ – n₂), 2I

B
(n₁ – n₂), 4I

C
(n₁ + n₂), 2I

D
(n₁ – n₂), I

Solution
Question 6
4 / -1

In a sonometer, the waves produced are

A
longitudinal progressive

B
transverse progressive

C
transverse, stationary and polarised

D
transverse, stationary and unpolarised
Question 7
4 / -1

A tuning fork produces 5 beats/sec. with a sonometer wire of lengths 40 cm and 44 cm, other factors remaining unchanged. The frequency of the tuning fork is

A
80 Hz

B
88 Hz

C
160 Hz

D
105 Hz

Solution
Question 8
4 / -1

A 5.5 metre length of string has a mass of 0.035 kg. if the tension in the string is 77 N , the speed of a wave on the string is

A
110 ms^–

B
165 ms^–

C
77 ms^–

D
102 ms^–

Solution
Question 9
4 / -1

Two parts of a sonometer wire divided by movable bridge differ in length by 0.2 cm and produce one beat per second, when sounded together. The total length of wire is one metre, then the frequencies are

A
250.5 and 249.5 Hz

B
230.5 and 229.5 Hz

C
220.5 and 219.5 Hz

D
210.5 and 209.5 Hz

Solution
Question 10
4 / -1

Two closed organ pipes A and B have the same length A is wider than B. They resonate in the fundamental mode at frequencies. n_A and n_B respectively.

A
n_A = n_B

B
n_A > n_B

C
n_A < n_B

D
Either (b) or (c) depending on the ratio of their diameters

Solution