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Worksheets

Physics Quarter-2

Total questions: 40

Worksheet time: 3600secs

Name
Class
Date
1.

The time period of a simple pendulum is 2sec. If the length is increased by 4 times, then its period become

a)

16 sec

b)

12 sec

c)

8 sec

d)

4 sec

2.

The Laplace correction in the expression for the velocity of sound is needed because sound waves

a)

Are of long wavelength

b)

Propagate isothermally

c)

Propagate adiabatically

d)

Are longitudinal

3.

A system exhibiting S.H.M must have

a)

Elasticity, inertia and an external force

b)

Elasticity as well as inertia

c)

Elasticity only

d)

Inertia only

4.

Doppler shift in frequency is independent of

a)

Distance from source to observer

b)

The speed of source

c)

The speed of observer

d)

The frequency of waves produced

5.

By rubbing the objects together, their internal energy:

a)

Remains constant

b)

Decreases

c)

Increases

d)

Becomes zero

6.

The ratio of fundamental wavelengths of one end close pipe to the both end open

pipe having same lengths

a)

1 : 4

b)

4 : 1

c)

1 : 2

d)

2 : 1

7.

The total energy of a particle executing SHM of amplitude xo is independent to

a)

x0

b)

x02x_0^2  

c)

1/x0-2

d)

x

8.

Which type of wave is used in submarine navigation system

a)

Transverse

b)

Longitudinal

c)

Both

d)

None

9.

If Cp=56 KJ and Cv=28 KJ then find number of moles.

a)

2.36

b)

3.36

c)

4.36

d)

5.36

10.

Which of the following quantities is non-zero at the mean position for a particle

executing SHM?

a)

Force

b)

Acceleration

c)

Velocity

d)

Displacement

11.

Instantaneous velocity of a body executing S.H.M at it mean position is

a)

ωx02x2\omega\sqrt[]{x_0^2-x^2}  

b)

ωx02\omega\sqrt[]{x_0^2}  

c)

ωx2\omega\sqrt[]{x^2}  

d)

Zero

12.

The first resonance length in a closed pipe is 20 cm then second resonance occurs at

a)

60 cm

b)

90 cm

c)

120 cm

d)

None

13.

In a stationary wave, the particle velocity at the nodal points is

a)

Zero

b)

Minimum but not zero

c)

Maximum and finite

d)

Infinity

14.

In a stationary wave the distance between consecutive antinodes is 25 cm. If the

wave velocity is 300 ms–1, then the frequency of wave will be

a)

300 Hz

b)

150 Hz

c)

750 Hz

d)

600 Hz

15.

When both source and listener move in the same direction with a velocity equal to

half the velocity of sound, the change in frequency of the sound as detected by the listener is:

a)

Zero

b)

25%

c)

50%

d)

None of these

16.

At what temperature the speed of sound in air will be 1.5 times its value at 27oC in air?

a)

102oC

b)

202oC

c)

204oC

d)

402oC

17.

The isothermal elasticity of a medium is Ei and the adiabatic elasticity is Ea. The

velocity of the sound in the medium is proportional to

a)

Ei\sqrt[]{E_i^{ }}  

b)

Eiγ\sqrt[]{E_i^{ }\gamma}  

c)

Ea

d)

Ei

18.

Which of the following has maximum audible frequency range?

a)

Dolphin

b)

Cat

c)

Bat

d)

Dog

19.

Velocity of sound is greatest in

a)

Water

b)

Air

c)

Copper

d)

Amonia

20.

Which one is the correct relation for fundamental frequency of open and closed

pipe?

a)

fopen = 2 fclosed

b)

fclosed = 2 fopen

c)

fopen = fclosed

d)

fopen = 1fclosed\frac{1}{f_{closed}^{ }}  

21.

The speed of stationary waves in a stretched string are independent of

a)

Number of loops

b)

Tension in the string

c)

Point where string is plucked

d)

Both A and C

22.

During which process the volume of system remains constant

a)

Isothermal

b)

Isobaric

c)

Isochoric

d)

Adiabatic

23.

A wave transfers

a)

Energy

b)

Momentum

c)

No mass

d)

All are possible

24.

Extremely loud sound produced by a sounding source moving at a speed greater

than the speed of sound is________

a)

Relativistic limit

b)

Red shift

c)

Sonic boom

d)

Blue shift

25.

Which one is true for an isothermal process?

a)

Q = w

b)

W = 0

c)

Q = 0

d)

W = – Δ\Delta  U

26.

The time taken by a particle to travel between a trough and a crest in a transverse wave is

a)

T

b)

3T/4

c)

T/2

d)

T/4

27.

It is possible to distinguish between transverse and longitudinal waves form the property of

a)

Refraction

b)

Polarization

c)

Interference

d)

Diffraction

28.

Doppler effect applies to

a)

Soundwave only

b)

Light wave only

c)

Both sound and light waves

d)

Neither sound nor light wave

29.

Which one of the following statements is true for the speed v and the acceleration a of a particle executing simple harmonic motion?

a)

When v is maximum, a is maximum

b)

Value of a is zero, whatever may be the value of v

c)

When v is zero, a is zero

d)

When v is maximum, a is zero

30.

A stationary wave is set up in the air column of a closed pipe. At the closed end of the pipe.

a)

Always a node is formed

b)

Always an antinode is formed

c)

Neither nod nor antinode is formed

d)

Sometimes a node and sometimes an antinode is formed

31.

A sound wave of wavelength 0.60 cm is produced in air and it travels at a speed of

300 ms-1. It will be an

a)

Audible wave

b)

Infrasonic wave

c)

Ultrasonic wave

d)

super sonic

32.

Consider the standing wave pattern shown below. A wave generated at the left end of the medium undergoes reflection at the fixed end on the right side of the medium. The number of antinodes in the diagram is

a)

3.0

b)

5.0

c)

6.0

d)

7.0

33.

A source of sound wave emits wave of frequency f. If ‘v’ is speed of sound waves. Then what will be the wavelength of the wave

a)

vf\frac{v}{f}  

b)

vuf\frac{v-u}{f}  

c)

vf

d)

(v - u)f

34.

The ratio of phase difference and path difference is:

a)

2P

b)

2πλ\frac{2\pi}{\lambda}   

c)

λ2π\frac{\lambda}{2\pi}  

d)

πλ\frac{\pi}{\lambda}  

35.

The internal energy of 1 mole of an ideal gas depends on:

a)

Only volume

b)

Only temperature

c)

Only pressure

d)

Temperature and pressure

36.

Two light waves being produced by two sources S1 and S2. Both sources have zero phase difference and have wavelength λ. The destructive interference of both the waves will occur of point P if (S1P – S2P) has the value

a)

112λ\frac{11}{2}\lambda  

b)

34λ\frac{3}{4}\lambda  

c)

2 λ

d)

5 λ

37.

A system undergoes an adiabatic process in which its internal energy increases by 20 J. Which of the following statements is true?

a)

20 J of work was done on the system

b)

20 J of work was done by the system

c)

The system received 20 J of energy as heat

d)

The system lost 20 J of energy as heat

38.

How much heat is needed to raise the temperature of 0.5 kg of water from 0°C to 100° C? (for water, c = 4186 J / Jkg°C\frac{J}{kg\degree C}

a)

236 kJ

b)

209 kJ

c)

124 kJ

d)

625 kJ

39.

A system is provided with 200 cal of heat and the work done by the system on the

surrounding is 40 J. Then its internal energy

a)

Increases by 600 J

b)

Decreases by 800 J

c)

Increases by 800 J

d)

Decreases by 50 J

40.

A particular set up gives the following frequencies 150 Hz, 450 Hz, 750 Hz …… the setup is

a)

A tube open at both ends

b)

A tube open at one end and closed at the other

c)

A wire stretched between two fixed ends

d)

A tuning fork