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OTI365 - NTSE - X Standard
NTSE SAT Physics - Sound and Wave Motion Important Questions

SAT Physics - Sound and Wave Motion

Exam Duration: 45 Mins Total Questions : 30

1 )

If a pendulum is allowed to oscillate into a jar containing water its time period will

(a)
increase
(b)
decrease
(c)
remain same
(d)
none of the above

2 )

K.E of the bob of a simple pendulum is maximum

(a)
at the mean position
(b)
at the extreme left position
(c)
at the extreme right position
(d)
between mean and extreme position

3 )

The intensity of loudness of sound is measured in unit of

(a)
hertz
(b)
volt
(c)
decibel
(d)
ampere

4 )

When sound hits a thin memberane

(a)
it causes the membrane to vibrate
(b)
the membrane reflects most of the sound
(c)
the amplitude of the sound increases
(d)
the frequency of the sound decreases

5 )

A pendulum having a period of oscillation of 4 s is taken on a planet where g is four times that on earth. The period of the pendulum would be

(a)
0.5 s
(b)
1 s
(c)
4 s
(d)
2 s

6 )

The speed Cof surface waves of wavelength \(\lambda \) .travelling in deep water is given by the equation C = \(\sqrt { \frac { \lambda g }{ 2\pi } } \) where g is the acceleration due to gravity. Which one of the following would give a straigh~ line graph given that f is the frequency of the waves?

(a)
f against \(\lambda ^{ -1 }\)
(b)
f against \(\lambda \)
(c)
f against \(\lambda ^{ 2 }\)
(d)
f² against \(\lambda ^{ -1 }\)

7 )

The amplitude of a wave is _______

(a)
The distance the wave moves in one second
(b)
The distance the wave moves in one time period of the wave
(c)
The maximum distance moved by the medium particles on either side of the mean position
(d)
The distance equal to one wave length

8 )

The physical quantity, which oscillates in most waves, is:

(a)
Mass
(b)
Energy
(c)
Amplitude
(d)
Wavelength

9 )

An example for mechanical wave is:

(a)
Radio wave
(b)
Light wave
(c)
Infrared radiation
(d)
Sound wave

10 )

Unit of wavelength is _____

(a)
Newton
(b)
Erg
(c)
Dyne
(d)
Angstrom

11 )

The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called ______

(a)
Reflection
(b)
Echo
(c)
Reverberation
(d)
Rarefaction

12 )

In the curve half the wavelength is

(a)
A B
(b)
B D
(c)
D E
(d)
A E

13 )

Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting

(a)
intensity of sound only
(b)
amplitude of sound only
(c)
frequency of the sitar string with the frequency of other musical instruments
(d)
loudness of sound

14 )

Ultrasonic waves are those waves:

(a)
which a man can hear
(b)
which a man cannot hear
(c)
which are of high velocity
(d)
which have high amplitude

15 )

Sound travels in air as:

(a)
longitudinal waves
(b)
transverse waves
(c)
torsional waves
(d)
electromagnetic waves

16 )

An echo is heard when minimum distance of the reflecting surface is:

(a)
10 cm
(b)
17 cm
(c)
34 cm
(d)
340 cm

17 )

The transfer of energy in a material medium due to the periodic motion of its particle is called:

(a)
wave front
(b)
wave motion
(c)
pulse
(d)
none of these

18 )

When a sound wave travels in the air, the physical quantity which is transferred from one place to the other is:

(a)
mass
(b)
force
(c)
momentum
(d)
energy

19 )

In case of longitudinal waves, the particles of medium vibrate:

(a)
in the direction of wave propagation
(b)
opposite to the direction of wave propagation
(c)
at right angles to the direction of wave propagation
(d)
none of the above

20 )

The longitudinal waves can propagate only in:

(a)
solids
(b)
liquids
(c)
gases
(d)
all the above

21 )

The change in density/pressure of a medium from maximum value to minimum value and again to maximum value, due to the propagation of a longitudinal wave is called complete:

(a)
oscillation
(b)
frequency
(c)
amplitude
(d)
none of these

22 )

If the frequency of a wave is 25Hz the total number of compression and rarefactions passing through a point in 1 second is

(a)
25
(b)
50
(c)
100
(d)
none of these

23 )

A longitudinal wave travels in water from west to east. The direction which the particles of medium move:

(a)
east to west
(b)
west to east
(c)
north to south
(d)
south to north

24 )

Sound travels fastest in:

(a)
vacuum
(b)
gases
(c)
solids
(d)
liquids

25 )

When the lightning strkes, we hear multiple cracks of thunder. These multiple reflections of sound are called

(a)
echoes
(b)
reverberations
(c)
resonance
(d)
none of the above

26 )

Waves travel more slowly on the surface of water when the water is shallow. A person drops a stone into a pool at X. The diagram shows the first wavefront on the surface of the pool. Which region of the pool is likely to be most shallow?

27 )

Which type of wave is used to send telephone signals to and from a satellite?

(a)
infra-red waves
(b)
light waves
(c)
microwaves
(d)
sound waves

28 )

A girl, standing 150 m in front of a tall building, fires a shot using a starting pistol. A boy, standing 350 m from the girl, hears two bangs I s apart.

From this information, what is the speed of sound in air?