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mcqs of
,
1 : The time period of a wave is 0.2 sec. Its frequency will be:
1
:
2 Hz
2
:
3 Hz
3
:
4 Hz
4
:
5 Hz
2 : The distance between a node and an antinode is equal to:
1
:
λ
2
:
λ/2
3
:
λ/3
4
:
λ/4
3 : Beats can be heard when the difference of frequency is not more than:
1
:
8 Hz
2
:
10 Hz
3
:
4 Hz
4
:
6 Hz
4 : Two identical tuning forks are operating simultaneously. The number of beats per second will be:
1
:
0
2
:
1
3
:
2
4
:
3
5 : At the open end of an organ pipe:
1
:
Nodes are formed
2
:
Antinodes are formed
3
:
Neither is formed
4
:
Both nodes and antinodes are formed
6 : On loading the prong of a tuning fork with wax, the frequency of sound:
1
:
Remains the same
2
:
Decreases
3
:
Increases
4
:
First increases then decreases
7 : A set of frequencies, which is the multiple of its fundamental frequency, are called:
1
:
Beat frequency
2
:
Harmonics
3
:
Nodal frequency
4
:
Doppler frequency
8 : The pitch of sound depends upon:
1
:
Intensity of sound
2
:
Wavelength of sound
3
:
Frequency of sound
4
:
Loudness of sound
9 : Beats are used to find unknown:
1
:
Frequency
2
:
Wavelength
3
:
Speed
4
:
Intensity
10 : A star moving away from Earth shows:
1
:
Green shift
2
:
Blue shift
3
:
Red shift
4
:
Yellow shift
11 : Which one is true for an organ pipe closed at one end?
1
:
λ = 2l/n
2
:
λ = 4l/n
3
:
λ = l/n
4
:
λ = nv/l
12 : The string of length l fixed at both ends is vibrating in two segments. The wavelength of the wave is:
1
:
l/4
2
:
l/2
3
:
l
4
:
2l
13 : The type of wave used in sonar is:
1
:
Sound waves
2
:
Light waves
3
:
Heat waves
4
:
Water waves
14 : The distance between the 1st node and 4th antinode is:
1
:
7λ/4
2
:
5λ/4
3
:
13λ/4
4
:
11λ/4
15 : The simple wave speed equation is represented by:
1
:
v = fλ
2
:
v = S/t
3
:
v = rω
4
:
v = d/t
16 : Stars moving towards the Earth show:
1
:
Blue shift
2
:
Red shift
3
:
No shift
4
:
Longer wavelength
17 : Stationary waves are defined as:
1
:
Waves that move with a constant velocity
2
:
Waves that move with a changing velocity
3
:
Waves that oscillate in a fixed position
4
:
Waves that propagate through a medium
18 : A node in a stationary wave is:
1
:
A point of maximum displacement
2
:
A point of intermediate displacement
3
:
A point of zero displacement
4
:
A point of infinite displacement
19 : What type of waves do headphones use to produce sound?
1
:
Electromagnetic waves
2
:
Mechanical waves
3
:
Pressure waves
4
:
Longitudinal waves
20 : An antinode in a stationary wave is:
1
:
A point of maximum displacement
2
:
A point of minimum displacement
3
:
A point of zero displacement
4
:
A point of infinite displacement
21 : The result of constructive interference between two waves is represented as:
1
:
A decrease in amplitude
2
:
No change in amplitude
3
:
An increase in amplitude
4
:
A shift in phase
22 : If the amplitude of the wave is tripled, then the amount of energy is increased by:
1
:
3 times
2
:
6 times
3
:
9 times
4
:
12 times
23 : Product of frequency 'f' and time 't' is:
1
:
1
2
:
Displacement
3
:
Velocity
4
:
Number of cycles
24 : In sonar we use:
1
:
Ultraviolet waves
2
:
Ultrasonic waves
3
:
Radio waves
4
:
Microwaves
25 : The waves that do not need any medium for their propagation are called:
1
:
Mechanical waves
2
:
Matter waves
3
:
Compressional waves
4
:
Electromagnetic waves
26 : The bending of waves around an obstacle is called as:
1
:
Refraction
2
:
Reflection
3
:
Diffraction
4
:
Interference
27 : The frequency of sound in a medium is 'f' and velocity 'v'. If the frequency becomes '4f' in the same medium, then the velocity will be:
1
:
v
2
:
2v
3
:
3v
4
:
4v
28 : If 20 waves pass through a medium in 1 sec. with a speed of 20 m/s, then the wavelength is:
1
:
20 m
2
:
400 m
3
:
40 m
4
:
1 m
29 : The point of maximum displacement on a stationary wave is:
1
:
Antinode
2
:
Node
3
:
Trough
4
:
Crest
30 : The periodic increase and decrease in loudness of sound is called:
1
:
Resonance
2
:
Interference
3
:
Beats
4
:
Polarization
31 : If 332 waves pass through a medium in one second with a speed of 332 m/s, then the wavelength will be:
1
:
7 m
2
:
332 m
3
:
664 m
4
:
1 m
32 : The waves which do not require any medium for their propagation are called:
1
:
Mechanical waves
2
:
Matter waves
3
:
Electromagnetic waves
4
:
Longitudinal waves
33 : The example of mechanical waves is:
1
:
Water waves
2
:
Radio waves
3
:
Infrared waves
4
:
Ultraviolet waves
34 : The Doppler Effect used in astronomy is for:
1
:
Measuring the diameters of stars
2
:
Determining velocity of galaxies
3
:
Analyzing properties of black holes
4
:
Studying behavior of electromagnetic waves
35 : A stationary wave is established in a string which vibrates in four segments at a frequency of 120 Hz. Its fundamental frequency is:
1
:
15 Hz
2
:
30 Hz
3
:
60 Hz
4
:
480 Hz
36 : A stretched string 4m long has 4 loops of stationary waves. The wavelength is:
1
:
1m
2
:
2m
3
:
3m
4
:
4m
37 : If 10 waves occupy 15cm, what is the wavelength?
1
:
0.6m
2
:
6cm
3
:
1.5cm
4
:
2.1cm
38 : On increasing the tension, the frequency of the vibration of a string:
1
:
Increases
2
:
Decreases
3
:
Remains constant
4
:
First increases then decreases
39 : Beats can be heard when the difference of frequency is not more than:
1
:
8Hz
2
:
10Hz
3
:
12Hz
4
:
16Hz
40 : Sound waves cannot travel through:
1
:
Air
2
:
Water
3
:
Material medium
4
:
Vacuum
41 : The louder the sound, the greater will be its:
1
:
Speed
2
:
Frequency
3
:
Amplitude
4
:
Wavelength
42 : The principle of superposition in waves is stated as:
1
:
The velocity of a wave is the product of its individual components
2
:
The displacement of a wave is the sum of the displacements of its individual components
3
:
The amplitude of a wave is the ratio of its individual components
4
:
The frequency of a wave is the difference of its individual components
43 : Harmonics are:
1
:
Integer submultiples of a fundamental frequency
2
:
Random frequencies
3
:
Integer multiples of a fundamental frequency
4
:
Non-integer multiples of a fundamental frequency
44 : If the period of wave motion is 0.01 sec and wave speed is 100 m/s, then the frequency of the wave is:
1
:
0.5 Hz
2
:
1 Hz
3
:
10 Hz
4
:
100 Hz
45 : The typical frequency range of microwaves is:
1
:
10³-10⁵ Hz
2
:
10⁵-10⁷ Hz
3
:
10⁸-10¹² Hz
4
:
10¹³-10¹⁶ Hz
46 : When two identical waves move in opposite directions, they give rise to:
1
:
Stationary waves
2
:
Beats
3
:
Diffraction
4
:
Refraction
Physics 11th MCQs || Ilam Ghar
Physics 11th
Chapter 7 : Waves and Vibrations
