1) The K.E and P.E of a particle executing SHM with

amplitude A will be equal to when its displacement is:

2) The bob of simple Pendulum is a spherical hallow ball filled

with water. A plugged hole near the bottom of the oscillating

bob gets suddenly unplugged. During observation, till water

is coming out, the time period of oscillation would:

d) First decrease and then increase to the original value

b) Increase towards a saturation value

c) First increase and then decrease to the original value

a) Remain Unchanged

3) If two tuning forks A and B are sounded together, they

produce 4 beats per second, A is then slightly loaded

with wax, they produce beats when sounded again. The

frequency of A is 256Hz. The frequency of B will be:

d) 262Hz

b) 252Hz

c) 260Hz

a) 250Hz

4) There are three sources of sound of equal intensity with

frequencies 400, 401 and 402 vibrations/sec. The frequencies 400, 401 and 402 vibrations/sec. The

number of beats heard per second is:

d) 3

b) 1

c) 2

a) 0

5) Two pulses in a stretched string whose centers are initially 8cm

apart are moving towards each other as shown in the figure. The

speed of each pulse is 2cm/s. After 2 second, the total energy of

the pulse will be:

d) Partially Kinetic Energy and Potential Energy

b) Purely Kinetic Energy

c) Purely Potential Energy

a) Zero 8cm

6) The Stretched string instead of plucked in middle is

plucked at a point (1/4th) of its length from either of its

ends. The frequency of vibration would be:

d) Same as when plucked in the middle

b) Twice when plucked in the middle

c) Eight times when plucked in the middle

a) Four times when plucked in the middle

7) The Sonometer wire, 100cm in length has a fundamental

frequency of 330Hz. The velocity of propagation of

transverse wave along the wire is:

d) 990 ms-1

b) 660 ms-1

c) 115 ms-1

a) 330 ms-1

8) A sufficiently long closed organ pipe has a small hole at

its bottom. Initially, the pipe is empty. Water is poured its bottom. Initially, the pipe is empty. Water is poured

in to the pipe at a constant rate. The fundamental

frequency of the air column in the pipe:

d) First decreases and then becomes constant

b) First increases and then becomes constant

c) Continuously decreases

a) Constantly increases

9) An increase in intensity level of one decibel implies an

increase in intensity of :

d) 0.1%

b) 3.01%

c) 26%

a) 1.0%

10) A rocket ship is recording from the earth at a speed

0.2c. The ship emits a signal of frequency 4 x 107 Hz. 0.2c. The ship emits a signal of frequency 4 x 107 Hz.

The apparent frequency to an observer on the surface

of the earth is :

d)

b)

c)

a)

11) A particle executing SHM has an acceleration of

0.5ms-2 for a displacement of 2m. Its period is :

d) 0.1256 s

b) 12.56 s

c) 125.6 s

a) 1.256 s

12) A wave of frequency 500Hz is propagating at a velocity 12) A wave of frequency 500Hz is propagating at a velocity

of 360ms-1. the distance between the two particle with a

phase difference of 600 is

b) 24cm

c) 48cm

a) 60cm

d) 12cm

13) A transverse wave is represented by the equation

, where the symbols have their

usual meaning. The ration (ω/k) has the Dimensions

d) [M L2T-2]

b) [M L0T-1]

c) [M0L T-1]

a) [M L T-2]

14) The Phase difference between two particles 25m apart,

when the wave y = 0.03 sin π[2t−0.01x] travels in a

medium, is :

d) π

b) π/4

c) π/2

a) π/8

15) The temperature at which the speed of sound in air is

1.5 times the speed of sound at 270C is

d) 204 K

b) 4020

c) 1020

a) 2040

16) The increase in speed of sound, on increasing the 16) The increase in speed of sound, on increasing the

temperature by 100C is

d) 600ms-1

b) 60ms-1

c) 6ms-1

a) 0.61ms-1

17) A tuning fork produces 5 beats per sec, when sounded

together with tuning fork of frequency either 250Hz or

260Hz. The frequency of A is

d) 270Hz

b) 245Hz

c) 255Hz

a) 265Hz

18) The variation of speed of sound in a gas with pressure

p is best represented by the following curve

a)

v

p

b)

v

p

c)

v

p

d)

v

p

19) The quality of sound depends on its:

d) Intensity

b) Frequency

c) Overtones present

a) Wavelength

20) The wavelength of light coming from a star shifts 20) The wavelength of light coming from a star shifts

towards violet end of the spectrum. This indicates that

the star is ,

d) Rotating

b) Receding from earth

c) Stationary

a) Approaching the earth

21) A circular disc has 1200 holes and it is rotating at rate

of 720 rpm. The frequency of the note emitted will be

d) 14,400Hz

b) 1.67Hz

c) 8400Hz

a) 1200 720Hz

22) Of the following, the graphs that better represents the 22) Of the following, the graphs that better represents the

variation of frequency f of a vibrating string with the

square root of tension is:

a)

f

b)

f

c)

f

d)

f

23) An open organ pipe X is twice as long as a closed pipe

Y. The ratio of their fundamental frequencies is,

d) 1 : 4

b) 1 : 2

c) 2 : 1

a) 1 : 1

24) A sonometer wire is vibrating in its second overtone. 24) A sonometer wire is vibrating in its second overtone.

The region between the two bridges contains

d) Three nodes and Three antinodes

b) Four nodes and Three antinodes

c) Three nodes and Two antinodes

a) Two nodes and Two antinodes

25) In brass string, the velocity of a longitudinal wave is

100 times the velocity of a transverse wave. If the

Young’s module of brass is 1011Nm2 , then the stress in

the wire is

d) 107 Nm-2

b) 109 Nm-2

c) 1011 Nm-2

a) 1013 Nm-2

26) The reverberation time for a crowded hall when

compared to that of an empty hall

d) can’t be determined

b) Is less

c) Is the same

a) Is more

27) The period of the simple pendulum in artificial satellite

and freely falling lifts will be

d) Unpredictable

b) Infinity

c) Finite but not Zero

a) Zero

28) If hole is drilled along a diameter of the earth and a 28) If hole is drilled along a diameter of the earth and a

stone is dropped into the hole then the stone:

d) Executes SHM about the centre of the earth

b) Comes to rest at the centre of the earth

c) Passes through a certain distance and return back

a) Passes through the hole and escapes from the earth

29) A and B are two hills at a distance 510m apart. A

person standing between the hills claps his hands and

hears two echoes at the end of 1s and 2s. The velocity of

sound in air (in ms-1)

d) 255

b) 340

c) 510

a) 1020

30) The frequency of wave represented by the equation30) The frequency of wave represented by the equation

d) 5Hz

b) 25Hz

c) 10Hz

a) 50Hz

31) Percentage increase in tension required to increase the

speed of propagation of a wave 25% along a given steel

wire is

d) 62.5%

b) 50%

c) 56.25%

a) 25%

32) The frequencies of two sources of sound are 180Hz and 32) The frequencies of two sources of sound are 180Hz and

484Hz. The time interval between two consecutive beats

is

d) 0.2 s

b) 0.25 s

c) 5 s

a) 4 s

33) A set of 30 tuning forks are arranged in a series in the

decreasing order of their frequencies. When two

consecutive forks in series are sounded together, they

produce 2 beats per second. The first fork has a

frequency that is the octave of the last. The frequency of

the first fork is:

d) noneb) 116Hz

c) 174Hza) 58Hz

34) The open pipe is suddenly closed at one end with the

result that the frequency of the 3rd harmonic of the

closed pipe is found to be higher by 100Hz than the

fundamental frequency of the open pipe. The

fundamental frequency of the open pipe is :

d) 200Hzb) 300Hz

c) 240Hza) 480Hz

35) The distance between the bridges of a sonometer is

adjusted such that the wire vibrates in unison with a

tuning fork of frequency fx .When the distance between

the bridges is decreased by 2% the wire and the fork

produce 5beats per second. The value of fx is

d) 245Hz

b) 400Hz

c) 250Hz

a) 500Hz

36) The fullness of tone in a fine concert hall is determined 36) The fullness of tone in a fine concert hall is determined

by,

d) The ratio of the loudness reverberant sound to that of

the direct sound.

b) Loudness of reverberation sound

c) The equilibrium sound level

a) Loudness of direct sound from the source

37) The effective absorbing surface area of the wall and

materials inside a hall measuring 50m x 26m x 8m for a

reverberation time with of ls is nearly,

d) none

b) 8 x 103 m2

c) 1.7 x 103 m2

a) 104 m2

38) A simple pendulum has time period T1 . The point of 38) A simple pendulum has time period T1 . The point of

suspension is now moved upward according to the

relation y = Kt2 ,(K=1ms-2) where y is the vertical

displacement. The time period now becomes T2 . The

ratio of

d) 1

b) 6/5

c) 4.5

a) 5/6

39) A whistling train approaches a junction. An observer

standing at junction observes the frequency to be

2.2KHz and 1.8KHz of the approaching and the

receding train. Find the speed of the train in ms-1

(Speed of Sound = 300ms-1)

d) 100 ms-1

b) 10 ms-1

c) 300ms-1

a) 30 ms-1

40) A source emits sound of frequency 600Hz inside water. 40) A source emits sound of frequency 600Hz inside water.

The frequency heard in air will be equal to

( Velocity of sound in Water = 1500ms-1,

Velocity of sound in air = 300ms-1 )

d) 6000Hz

b) 120Hz

c) 600Hz

a) 3000Hz

41) A particle executes SHM between x = −A and x = +A.

The times taken for it go from 0 to A/2 isT1 and to go

from A/2 to A is T2. Then

d) T1 = 2T2

b) T1 > T2

c) T1 = T2

a) T1 < T2

42) A sound wave of frequency 500Hz covers a distance of

1000m in 5s between points X and Y . Then the number

of waves between X and Y are :

d) 5000

b) 1000

c) 2500

a) 500

43) Wavelength of two notes in air are 80/195m and

80/193m. Each note produces five beats per second with

a third note of a fixed frequency. Calculate the velocity

of sound in air.

d) 415 ms-1

b) 425 ms-1

c) 400 ms-1

a) 450 ms-1

44) Calculate the velocity of sound in a gas in which two 44) Calculate the velocity of sound in a gas in which two

waves of length 50cm and 50.4cm produce 6 beats/sec

d) 229ms-1

b) 320ms-1

c) 378ms-1

a) 478ms-1

45) When a tuning fork A of unknown frequency is

sounded with another tuning fork B of frequency 256Hz

then 3 beats/sec are observed. After that A is loaded

with wax and sounded, then again 3beats/sec are

observed. The frequency of tuning fork A is:

d) 262Hzb) 253Hz

c) 259Hza) 250Hz

46) An engine is moving on a circular path of radius 100m

with a speed of 20ms-1 . What will be the frequency

observed by an observer standing stationary at the

centre of circular path when engine blows a whistle of

frequency 500Hz :

d) No sound is heard

b) Less than 500Hz

c) 500Hz

a) More than 500Hz

47) A man standing between 2 cliffs fires a gun and hears

two successive echoes 1.2sec and 2.2sec after the firing.

What is the distance between the cliffs? (vs=300ms-1)

d) 510m

b) 360m

c) 660m

a) 150m

48) Calculate the intensity level of sound having intensity

10 watt m-2

b) 120dBa) 100dB

d) 110dB

b) 120dB

c) 130dB

a) 100dB

49) A resonance air column resonates with a tuning fork of

frequency 480Hz at length 0.20 m. Calculate the

velocity of sound in air.

d) 452ms-1

b) 128ms-1

c) 384ms-1

a) 288ms-1

50) Resonance was observed with an air column when its

length was 0.25m and again when it was 0.5m . If the

frequency of the fork is 512Hz, calculate the velocity of

the sound in air.

d) 256ms-1

b) 384ms-1

c) 128ms-1

a) 512ms-1

51) Calculate the reverberation time for an auditorium in

which sound decays by absorption through 50 decibels

in 1.2sec.

d) 1.60 sec

b) 1.44 sec

c) 1.00 sec

a) 1.81 sec

52) A transfers wave along a stretched string is represented

below then which of the following is true

a. (1, 7) and (2, 8) are in phase

b. (3, 6) and (2, 4) are in phase

c. (2, 5) and (5, 8) are not in phase

1

2

3

4

57

8

d) a, b & c are all true

b) a & b are true

c) a & c are true

a) Only b is true

15

6

7

53) The amplitude of sound wave at a distance of 0.2Km

from source is A . What is the amplitude of the wave at

a distance of 0.4Km from source.

d) A

b) A/4

c) 2A

a) A/2

54) The frequencies of two sound waves are 512Hz and 54) The frequencies of two sound waves are 512Hz and

516Hz. What will be the time interval between two

consecutive beats?

d) 0.0 sec

b) 0.4 sec

c) 0.25sec

a) 1.0 sec

55) How many beats are heard per second when there are

three sources of equal intensity with frequencies

d) 2 beats per sec

b) 1 beat per sec

c) 0 beat per sec

a) 3 beats per sec

d) 2 beats per sec

56) For what wavelength of waves, does a closed pipe of

length 30cm emit the first overtone.

d) 40cm

b) 44cm

c) 38cm

a) 35cm

57) A brass wire and a steel wire of the same length and

diameter are stretched to the same tension. Which wire

emits a higher fundamental frequency?

d) Data is incomplete

b) Steel wire has higher frequency than brass wire

c) Both have same frequency

a) Brass wire has higher frequency than steel wire

d) Data is incomplete

58) A stretched string of length 0.6m vibrates in its third

mode. What is the wave length of waves on the string?

d) 0.4m

b) 1.2m

c) 0.3m

a) 0.9m

59) A spherical and cylindrical surfaces must be avoided in

auditorium to avoid because,

d) None of the above

b) Undesirable focusing of sound

c) It is not fashionable

a) Produces echoes

60) Echo which has a musical ring is called

b) Echelon effecta) Noise Pollution

d) Pop musicc) Classical music

61) Why sound persisted even after the source stops

emitting sound

d) Just Illusion

b) Multiple reflection

c) Echo

a) Reverberation effect