Waves MCQs
Multiple choice questions.
1.) The speed of the wave v can be expressed as
a)λT.
b) λ/T
c) λ²T.
d) λ/T²
Ans : b) λ/T
2.) The speed of the wave v can be expressed as
a)fλ.
b) f/λ
c) f²λ.
d) f/λ²
Ans : a) fλ
3.) E be the electric modulus and ρ be the density then speed of sound wave can be expressed as, v = _____
a)E/ρ.
b) Eρ
c) √(E/ρ).
d) √(ρ/E)
Ans : c) √(E/ρ)
4.) The density is proportional to the pressure, the speed of sound is not affect by a variation in the pressure of the _____
a) solid.
b) liquid
c) gas.
d) plasma
Ans : c) gas
5.) When a gas is heated at constant pressure, its volume is
a) increases. b) decreases
c) equal. d) zero
Ans : a) increases
6.) When a gas is heated at constant pressure its density is,
a) increases.
b) decreases
c) equal.
d) zero
Ans : b) decreases
7.) According to principle of superposition, two waves having same frequency and traveling in the _______ direction.
a) same.
b) different
c) equal.
d) opposite
Ans : a) same
8.) According to principle of superposition two waves of slightly different frequencies and traveling in the _______ direction.
a)same.
b) different
c) equal.
d) opposite
Ans : a) same
9.) According to principle of superposition two waves of equal frequency traveling in _______ direction.
a)same.
b) different
c) equal.
d) opposite
Ans : d) opposite
10.) Superposition of two waves having the same frequency and traveling in the same direction results in a phenomenon called ________
a)beat.
b) Resonance
c) interference.
d) oscillation
Ans : c) interference
11.) Whenever path difference is an integral multiple of wavelength, the two waves are added up. This effect is called.
a) Contractive interference
b) Destructive interference
c) Constructive beats
d) Destructive beats
Ans : a) Constructive interference
12). The condition for constructive interference can be written as, ∆S = ______
a) nλ.
b) n²λ
c) λ/n².
d) n/λ
Ans : a) nλ
13.) The condition for constructive interference can be written as, ∆S = ______ (λ/2)
a)(n+1).
b)(2n+1)
b) (n²+1).
d) (n²+n)
Ans : b) (2n+1)
14.) At points where the displacements of two waves cancel each other’s effect, the path difference is an odd integral multiple of half the wavelength. This effect is called.
a) Contractive interference
b) Destructive interference
c) Constructive beats
d) Destructive beats
Ans : b) Destructive interference
15.) Number of beats per second is ______ to the difference between the frequencies of the tuning forks.
a) equals. b) ½ times equals
c) ⅓ times equals. d) ¼ times equals
Ans : a) equals
16.) If a transverse wave traveling in a rare medium is incident on a denser medium, it is reflected such that it undergoes a phase change of ________
a) 90°.
b) 180°
c) 270°.
d) 360°
Ans : b) 180°
17.) If a transverse wave traveling in a denser medium is incident on a rarer medium , it is reflected without any change in ________
a) beats.
b) phase
c) interference.
d) path
Ans : b) phase
18.) If there is same relative motion between the source of waves and the observer , an apparent change in frequency of the waves is observed, then it is called,
a) phase effect. b) Doppler effect
c) interference effect. d) beat effect
Ans : b) Doppler effect
19.) If the particles of the medium vibrate perpendicular to the direction of propagation of the wave, then such wave is called.
a) transverse wave. b) longitudinal wave
c) beat. d) phase
Ans : a) transverse wave
20.) If the particle of the medium vibrate parallel to the direction of propagation of the wave then such wave is called.
a) transverse wave. b) longitudinal wave
c) beat. d) phase
Ans : b) longitudinal wave
21.) If a particle of the medium is simultaneously acted upon by two waves, then the resultant displacement of the particle is the algebraic sum of their individual displacement. This is called principle of
a) beats.
b) superposition
c) superpartician.
d) tangential
Ans : b) superposition
22.) The periodic variation of sound between maximum and minimum loudness are called,
a)beats.
b) superposition
c) superpartician.
d) tangential
Ans : a) beats
23.) Stationary waves are produced in medium, when two identical wave traveling in _______ direction interfere in that medium.
a) same.
b) different
c) equal.
d) opposite
Ans : d) opposite
24.) The pipe which is open at both ends, is richer in harmonics then fn = nv/_____
a)2πl.
b)2l
c) 3l.
d) 4l
Ans : d) 4l
25.) Effect of temperature on the speed of sound in a gas can be expressed as
vt = vo + ______ t
a)6.1
b) 0.61
c) 1.6
d) 0.16
Ans : b) 0.61