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Chapter Test: Waves - JEE MCQ


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30 Questions MCQ Test - Chapter Test: Waves

Chapter Test: Waves for JEE 2024 is part of JEE preparation. The Chapter Test: Waves questions and answers have been prepared according to the JEE exam syllabus.The Chapter Test: Waves MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Chapter Test: Waves below.
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Chapter Test: Waves - Question 1

The path difference between two wavefronts emitted by coherent sources of wavelength 5460 Å is 2.1 micron . The phase difference between the wavefronts at that point is _

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Chapter Test: Waves - Question 2

The path difference between two waves 
y1= A1 sin wt and y2= A2 cos (wt + f) will be

Detailed Solution for Chapter Test: Waves - Question 2

y1= A1 sin wt
y2= A2 cos (wt + f)
Now, y2 = A2 sin (wt + f + pi/2)
So, phase difference = f + pi/2
Path Difference = (λ/2pi)(f + pi/2)
Hence B.

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Chapter Test: Waves - Question 3

The equation for two waves obtained by two light sources are as given below :

y1= A1 sin 3wt, y2 = A2 cos (3wt + p/6). What will be the value of phase difference at the time t _

Detailed Solution for Chapter Test: Waves - Question 3

y1=Asin3 ωt
y2=A2cos(3ωt+p/6)
y2=A2cosd2
y1=A sin(3ωt+p/2- p/2)
   =A sin(p/2+3ωt- p/2)
y1=A cos(3ωt- p/2)  [sin(p/2+θ)=Cosθ]
y1=A1cosd1
d2-d1=(3ωt+p/6)- (3ωt- p/2)
=p/6+p/2=2p/3

Chapter Test: Waves - Question 4

In coherent sources it is necessary that there

Detailed Solution for Chapter Test: Waves - Question 4

Two sources are said to be coherent if there always exists a constant phase difference between the waves emitted by these sources. But when the sources are coherent, then the resultant intensity of light at a point will remain constant and so interference fringes will remain stationary.

Chapter Test: Waves - Question 5

Figure, shows wave fronts in still water, moving in the direction of the arrow towards the interface PQ between a shallow region and a deep (denser) region. Which of the lines shown may represent one of the wave fronts in the deep region ?

               

Detailed Solution for Chapter Test: Waves - Question 5

The sole reason is 'refraction' in a single word. Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refraction, or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves. Water waves travel fastest when the medium is the deepest. Thus, if water waves are passing from deep water into shallow water, they will slow down. But here it is traveling from shallow water to deep water, then the waves bend in the opposite direction.

Chapter Test: Waves - Question 6

In Young's double slit experiment 62 fringes are visible in the field of view with sodium light (l = 5893Å). If green light (l = 5461Å) is used then the number of visible fringes will be _

Detailed Solution for Chapter Test: Waves - Question 6

Wavelength of light used is inversely proportional to number of fringes observed.

Chapter Test: Waves - Question 7

In young's double slit experiment, interference pattern is observed on the screen L distance apart from slits, average distance between adjacent fringes is x and slits separation is d, then the wavelength of light will be _

Detailed Solution for Chapter Test: Waves - Question 7

Fringe width = λD/d
where λ us wavelength
D is the distance between slits & screen
d is the distance between slits
ATQ: x = Lλ/d => λ = xd/L

Chapter Test: Waves - Question 8


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Chapter Test: Waves - Question 9


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Chapter Test: Waves - Question 10


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Chapter Test: Waves - Question 11


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Chapter Test: Waves - Question 12

A tuning fork of frequency n is sounded at the open end of a long cylindrical tube having a side opening and fitted with a movable reflecting piston. On moving the piston through 9 cm, the intensity of sound heard by the listener changes from maximum to minimum. If speed of sound is 360 m/s, value of n is 


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Chapter Test: Waves - Question 13


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Chapter Test: Waves - Question 14

In a resonance pipe the first and second resonance are obtained at lengths 22.7 cm and 70.2 cm respectively. What will be the end correction -

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Chapter Test: Waves - Question 15

A wall is moving with velocity u and a source of sound moves with velocity u/2 in the same direction as shown in the figure. Assuming that the sound travels with velocity 10u. The ratio of incident sound wavelength on the wall to the reflected sound wavelength by the wall, is equal to -


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Chapter Test: Waves - Question 16

One end of a thin metal tube is closed by thin diaphragm of latex and the tube is lower in water with closed end downward. The tube is filled with a liquid 'x'. A plane progressive wave inside water hits the diaphragm making an angle 'θ' with its normal. Assuming Snell's law to hold true for sound. Maximum angle 'θ' for which sound is not transmitted through the walls of tube is (velocity of sound in liquid x = 740√3 m/s and in water = 1480 m/s)

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Chapter Test: Waves - Question 17


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Chapter Test: Waves - Question 18


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Chapter Test: Waves - Question 19


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Chapter Test: Waves - Question 20

A tuning fork and an air column in resonance tube whose temperature is 51°C produces 4 beats in 1 second when sounded together. When the temperature of the air column decreases, the number of beats per second decreases. When the temperature remains 16°C, only 1 beat per second is produced. Then the

frequency of the tuning fork is -

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Chapter Test: Waves - Question 21

A boat at anchor is rocked by waves whose crests are 100 m apart and velocity is 25 m/s. The boat bounces up once in every -

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Chapter Test: Waves - Question 22

A closed organ pipe of length L is vibrating in its first overtone. There is a point Q inside the pipe at a distance 7 L/9 from the open end. The ratio of pressure amplitude at Q to the maximum pressure amplitude in the pipe is

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Chapter Test: Waves - Question 23

A balloon filled with CO2, then for sound wave this will behave as a -

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Chapter Test: Waves - Question 24


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Chapter Test: Waves - Question 25


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Chapter Test: Waves - Question 26


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Interference is phenomena of more than one wave reaching at same point in space simultaneously.

Chapter Test: Waves - Question 27

The speed of sound in air at N.T.P is 300 m/s. If pressure of air is increased to four times keeping the temperature constant, the speed of sound will becomes –

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Since velocity is independent of pressure so no change

Chapter Test: Waves - Question 28


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Chapter Test: Waves - Question 29

The first overtone of an open organ pipe and the fundamental tone of a closed organ pipe give 5 beats per second when sounded together. If the length of the closed pipe is 25 cm, what are the possible lengths of the open organ pipe (Speed of sound in air = 340 m/sec) -

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Chapter Test: Waves - Question 30


Detailed Solution for Chapter Test: Waves - Question 30

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