Paper for Entry Test Preparation
Physics 1st year Chapter No. 8
Total marks:- 200 Time
allowed 40 minutes
Note:- Fill
the appropriate answer of the following questions in the answer sheet. Double
filling and erasing is not allowed. Each question carries equal marks and for
each wrong answer minus one is awarded.
1) When a wave travels from one place to another, it
transfers:
a)
Matter b)
Energy c)
Momentum d) Both
(b) and (c)
2) Which of the following is not an example of
mechanical wave:
a)
Sound wave b) Light
wave c) Waves
produces by a spring d) Non of all
3) The distance covered by the wave in one second
is:
a)
Wave number b) Wave
length c) Frequency d) Wave speed
4) In compressional wave, the layer of medium having
reduced pressure is called:
a)
Compression b)
Elasticity c)
Node d)
Rarefaction
5) Transverse waves can be set up in:
a)
Solids b)
Liquids c)
Gases d)
All of above
6) A travelling wave has a shape of:
a)
Square wave b) Sine
wave c) Parabola d) Hyperbola
7) Fluids can transmit:
a)
Transverse wave b)
Longitudinal wave c) Both (a)
and (b) d) Non of all
8) The portion of the wave above its mean level
forms a:
a)
Crest b)
Trough c)
Both (a) and (b) d) Non
of all
9) Which of the following reminds us about
longitudinal waves:
a)
Sound waves b) Heat
waves c)
Electromagnetic waves d) Light
waves
10) The wave motion set up in any medium depends
upon:
a)
Elasticity b)
Inertia c)
Density d)
All of these
11) Transverse wave motion is possible in:
a)
Air b)
A mixture of NH3 and O2 c)
Strings d)
All of above
12) The distance b/w two consecutive rarefactions is
called:
a)
Wavelength b)
Frequency c)
Amplitude d)
Displacement
13) Sound waves can not propagate through:
a)
Wood b) Water c) Vacuum d) Walls
14) The ultrasonic have the frequency:
a)
In the audible range b) Above
20,000 Hz c) Below 20 Hz d) B/w 20-20,000 Hz
15) Sound waves having frequencies b/w 2KHz and 4KHz
are called:
a)
Infrasonic b)
Ultrasonic c)
Threshold of hearing d)
Supersonic
16) Laplace assumed that sound travels in gases
under __ condition:
a)
Isothermal b)
Adiabatic c)
Isochoric d)
Isobaric
17) The speed of sound is greatest in:
a)
Air b)
Steel c)
Ammonia d)
Water
18) Sound waves can only travel through:
a)
Non-metals b)
Vacuum c)
Material medium d) All of
above
19) When the wind is blowing in the same direction
in which the sound is travelling, the speed of sound will:
a)
Decreased b)
Increased c)
Remain unchanged d) Become
half
20) A supersonic plane flies with the speed ___
speed of sound:
a)
Less than b)
Equal to c)
Greater than d)
Non of all
21) At what temperature the speed of sound in air is
doubles its value at 0oC:
a)
1090oC b)
819oC c)
546oC d)
273oC
22) For gases having the same value of ‘r’ the speed
of sound is inversely proportional to:
a)
Square root of density b) Square
of density c) Density d) Cube of
density
23) Two identical tuning forks emitting sound waves
in the same direction will produce:
a)
Beats b)
Stationary waves c)
Interference d)
Resonance
24) If the difference b/w frequency of the tuning
forks is ‘n’, the number of beats produces in two seconds are:
a)
n b)
2n c)
3n d)
4n
25) For destructive interference of two wave, the
path difference b/w them is:
a)
Zero b)
λ/2 c)
λ d)
2λ
26) When the prongs of a tuning forks is filed, its
frequency:
a)
Increases b)
Decreases c)
Remain unchanged d) Non of
all
27) The two sources are said to be coherent if they
have same:
a)
Intensity b)
Colour c)
Phase d)
Non of all
28) Interference can only produced when the two
waves have the same:
a)
Time period b)
Phase c)
Wavelength d)
Amplitude
29) In any medium, there can be produced stationary
waves of:
a)
All frequencies b)
Discrete set of frequencies c) Continuous
frequencies d) Non of all
30) In standing wave pattern, the antinodes are the
points of:
a)
Zero amplitude b) Unit
amplitude c) Minimum
amplitude d) Maximum amplitude
31) The open end of the tube in a resonance
experiment is taken as:
a)
Anti-node b)
Node c)
Both of them d) Non
of all
32) In standing waves, if λ = 1/2 in case of a
string, then number of loops are:
a)
One b)
Two c)
Three d)
Four
33) In case of standing waves, as the string
vibrates in more and more loops, its wavelength:
a)
Goes on increasing b) Goes on
decreasing c) Remains constant d) Non of these
34) In stationary waves, energy is:
a)
Uniformly distributed b) Maximum
at nodes c) Maximum at
anti-nodes d) Non of these
35) With the increase in the stretched force of a
wire, its frequency:
a)
Increases b)
Decreases c)
Remain constant d) Non of
all
36) The distance equal to one fourth of a wavelength
is b/w:
a)
Two consecutive nodes b)
Two consecutive anti-nodes
c)
B/w consecutive node and anti-nodes d)
Non of all
37) When length and diameter of a wire is increased,
and is stretched, then its frequency:
a)
Increases b)
Decreased c)
Remain same d) Non
of all
38) The fixed ends of a vibrating string are called:
a)
Overtones b)
Anti-nodes c)
Nodes d)
Beats
39) Energy is not carried by:
a)
Transverse progressive waves b)
Longitudinal progressive waves
c)
Stationary waves d)
All of above
40) The ratio of the fundamental frequency of an
open end and closed end organ pipes of the same length is:
a)
2 : 1 b)
1 : 2 c)
1 : 1 d)
4 : 1
41) A pulse on a string is inverted when it is
reflected from:
a)
A fixed end b) A
free end c)
Either of the ends d) Non
of all
42) The wavelength of light coming from a star
shifts towards the violet end of the spectrum, this shoes that the star is:
a)
Approaching the earth b) Receding
form the earth c) Stationary d) Non of them
43) Doppler’s effect applies to:
a)
Sound waves only b) Light
waves only c) Both (a) and
(b) d) Non of all
44) In which case, Doppler’s effect is used in:
a)
Radar b)
Sonar c)
To find speed of stars d) All of
above
45) When source of sound moves away from a
stationary listener, frequency of sound heard by the listener is __ that
produced
by the source:
a)
Less than b)
Greater than c) Same
as d) Non of
all
46) As an empty test tube is filled with water,
frequency of the air column:
a)
Decreases b)
Remains same c)
Increases d)
Non of all
47) A person moves with speed thrice the speed of
sound waves towards the stationary source, the frequency will be:
a)
Increase 3 times b)
Decrease 4 times c)
Decrease 3 times d)
Increase 4 times
48) The wavelength of sound produces by an open
organ pipe in nth mode is:
a)
2l / n b)
2nl c)
2n + l d)
Non of all
49) With the increase in the stretched force of a
wire, its frequency:
a)
Increases b)
Decreases c)
Remains same d) Non of
all
50) The path difference DS = nλ indicates that
interference of two waves is:
a)
Constructive b)
Destructive c)
Either (a) or (b) d) Non
of all
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