Waves MCQ Level - 2 - Bank Exams MCQ

# Waves MCQ Level - 2 - Bank Exams MCQ

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## 10 Questions MCQ Test General Awareness & Knowledge - Waves MCQ Level - 2

Waves MCQ Level - 2 for Bank Exams 2024 is part of General Awareness & Knowledge preparation. The Waves MCQ Level - 2 questions and answers have been prepared according to the Bank Exams exam syllabus.The Waves MCQ Level - 2 MCQs are made for Bank Exams 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Waves MCQ Level - 2 below.
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Waves MCQ Level - 2 - Question 1

### When a source of sound of frequency crosses a stationary observer with a speed v, ( « speed of sound v), the apparent change in frequency Δf is given by :

Detailed Solution for Waves MCQ Level - 2 - Question 1

Waves MCQ Level - 2 - Question 2

### In a stationary wave that forms as a result of reflection of wave from an obstacle the ratio of the amplitude at an antinode to the amplitude at node is n. The fraction of energy reflected is :

Detailed Solution for Waves MCQ Level - 2 - Question 2

Let ai, and ar be the amplitudes of incident and reflected waves. Then

∴ Fraction of energy reflected is

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Waves MCQ Level - 2 - Question 3

### The displacement y of a particle executing periodic motion is given by : The expression may be consider to be a result of the superposition of independent harmonic motions :

Detailed Solution for Waves MCQ Level - 2 - Question 3

The given equation can be written as

y = 2(cost + 1) sin(1000t)
= 2cost sin 1000t + 2sin(1000t)
= sin(1001t) + sin(999t) + 2sin(1000t)
i.e. the given expression is a small of superposition of three independent harmonic motions of angular frequencies 999,1000 and 1001 rad/sec.

Waves MCQ Level - 2 - Question 4

The displacement of particles in a string stretched in the x-direction is represented by y.  Among the following expressions for y, those describing wave motion are :

Detailed Solution for Waves MCQ Level - 2 - Question 4

Only first equation is the equation of standing wave. The condition for a function x and t to represent a wave is :

Only first equation satisfies the condition.

Waves MCQ Level - 2 - Question 5

A transverse wave is described by the equation  The maximum particle velocity is equal to four times the wave velocity if :

Detailed Solution for Waves MCQ Level - 2 - Question 5

Wave velocity
Maximum particle velocity
Given,
or

Waves MCQ Level - 2 - Question 6

A transverse wave  in metres, is propagating along +ve X- axis on a string. A light insect starts crawling on the string with the velocity of 5 cm/s at t = 0 along the +ve X- axis from a point where x = 5 cm . After 5 s  the difference in the phase of its position is equal to :

Detailed Solution for Waves MCQ Level - 2 - Question 6

At t = 0, x = 5 cm, initial phase of insect

After 5s insect will more a distance s = vt = 25 cm
So, it will beat x = 30 cm .
At this instant,

Waves MCQ Level - 2 - Question 7

Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the wavelength of reflected wave will be :

Detailed Solution for Waves MCQ Level - 2 - Question 7

Apparent frequency for reflector (will act as an observer) would be :

where f = actual frequency of source.
After being reflected the apparent frequency will further change and the reflector will now behave as a source. The apparent frequency will now become :

Substituting value of f1, we get

Waves MCQ Level - 2 - Question 8

A train is moving with a constant speed along a circular track. The engine o f the train emits a sound of frequency f. The frequency heard by the guard at rear end of the train :

Detailed Solution for Waves MCQ Level - 2 - Question 8

Let v be the speed of sound and u the speed of train.

Then
and

The correct answer is: is equal to f

Waves MCQ Level - 2 - Question 9

A standing wave is maintained in a homogeneous string of cross-sectional area a and density p. It is formed by superposition of two waves travelling in opposite directions given by the equation.

The total mechanical energy confined between the sections corresponding to the adjacent antinodes is :

Detailed Solution for Waves MCQ Level - 2 - Question 9

Distance between two adjacent antinodes is
Volume of string between two adjacent antinodes

Here, u is the energy density (energy per unit volume) which is equal to

Waves MCQ Level - 2 - Question 10

A travelling wave is partialy reflected partialy and partly transmitted from a rigid boundary. Let av ar and at be the amplitudes of incident wave, reflected wave and transmitted wave and li, Ir and lt be the corresponding intensities. Then choose the correct alternative:

Detailed Solution for Waves MCQ Level - 2 - Question 10

only when other properties like density of medium, speed of wave etc, remains the same
In incident and reflected waves medium is same. Therefore, other properties are same. Hence,

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## General Awareness & Knowledge

389 videos|546 docs|149 tests