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NTSE SAT Physics - Sound and Wave Motion Sample Questions

NTSE SAT Physics - Sound and Wave Motion

Exam Duration: 45 Mins Total Questions : 30

1 )

The motion of the particles of air, when sound waves pass through it is

(a)
Periodic
(b)
adiabatic
(c)
isothermal
(d)
oscillatory but not periodic

2 )

The speed of sound in air

(a)
decreases with increase in temperature
(b)
increases with increase in temperature
(c)
increases with decrease in temperature
(d)
remains the same with increase in temperature

3 )

The speed of an object moving faster than the speed of sound in air is known as

(a)
infrasonic
(b)
supersonic
(c)
ultrasonic
(d)
none

4 )

The sound propagates in a gaseous medium by

(a)
transverse
(b)
Longitudinal
(c)
both A and B
(d)
neither A nor B

5 )

A sonar from a ship finds that the ultrasound pulse sent from the ship is detected after 2 seconds. Whatis the distance of the object from the ship? [The velocity of ultrasound is 1500 m/s in water}

(a)
1500 m
(b)
3000 m
(c)
4500 m
(d)
8000 m

6 )

The minimum distance between the source and the reflector so that an echo is heard is approximately equal to _____

(a)
10m
(b)
17 m
(c)
34 m
(d)
50 m

7 )

Bats detect the obstacles in their path by receiving the reflected _______

(a)
Infrasonic waves
(b)
Radio waves
(c)
Electro-magnetic waves
(d)
Ultrasonic waves

8 )

Sound waves do not travel through

(a)
Solids
(b)
Liquids
(c)
Gases
(d)
Vacuum

9 )

The distance between a compression and the next rarefaction of a longitudinal wave is

(a)
\(\lambda\over 3\)
(b)
2l
(c)
\(\lambda\over 2\)
(d)
\(\lambda\over 8\)

10 )

A sound wave travels from east to west, in which direction do the particles of air move?

(a)
East - west
(b)
North - south
(c)
Up and down
(d)
None ofthese

11 )

Pitch of high frequency sound is:

(a)
High
(b)
Low
(c)
Zero
(d)
Infinite

12 )

Note is a sound

(a)
of mixture of several frequencies
(b)
of mixture of two frequencies only
(c)
of a single frequency
(d)
always unpleasant to listen

13 )

A sound wave produces 60 compressions and 60 rarefactions in 0.6 see then the frequency of sound wave is

(a)
50 Hz
(b)
100 Hz
(c)
20 Hz
(d)
none of these

14 )

When a wave goes from one medium to another medium. Which quantity does not changes

(a)
frequency
(b)
wavelength
(c)
velocity
(d)
time period

15 )

Which of the following sound waves can not be heard by human?

(a)
20 Hz
(b)
500 Hz
(c)
15 Hz
(d)
1500 Hz

16 )

When mechanical waves have a frequency above the audible range, these are called

(a)
sonics
(b)
infrasonics
(c)
ultrasonics
(d)
suspersonics

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 )

An instrument commonly used in laboratory to produce a sound of some particular frequency is:

(a)
sonar
(b)
electric bell
(c)
tuning fork
(d)
a stretched wire

19 )

A transverse wave consists of:

(a)
crests and trouhs in the medium
(b)
compressions and rarefactions in the medium
(c)
both (a) and (b)
(d)
neither (a), nor (b)

20 )

A part of longitudinal wave in which particles of medium are farther away that the normal particles is called:

(a)
rarefaction
(b)
trough
(c)
compression
(d)
crest

21 )

In case of transverse wave:

(a)
the hump on the -y axis is called trough
(b)
the lowest point the hump on the -y axis is called trough
(c)
the hump on +y axis called trough
(d)
the highest point on the hump on the +y axis is called trough

22 )

In case of transverse wave the wavelength is the linear distance between:

(a)
two consecutive troughs
(b)
two consecutive crests
(c)
one crest and one trough
(d)
both (a) and (b)

23 )

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

24 )

A stretched string is plucked gently to produce a note. The string is producing

(a)
longitudinal waves
(b)
stationary waves
(c)
transverse waves
(d)
both (a) & (b)

25 )

Sound travels fastest in:

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

26 )

What happens to light as it passes from glass into air?

(a)
Its frequency decreases because its speed decreases.
(b)
Its frequency increases because its speed increases.
(c)
Its wavelength decreases because its speed decreases.
(d)
Its wavelength increases because its speed increases.

27 )

A flash of lightning and the corresponding sound of the thunder are detected 6 s apart. A student calculates that the lightning struck about 1800 m away. On which assumption is the calculation based?