chap.8 wave MCQs with solution

1)	. Waves transmit ________ from one place to another. b) Energy                           b) Mass c)  Both                                d) None	A
2)	The waves that require a material medium for their propagation are called b) Matter waves              b) Electromagnetic waves c)  Carrier waves             d) Mechanical waves	D
3)	The example of mechanical waves is: b) Water and air waves b) Radio waves c)  Infrared waves          d) Ultra violet waves	A
4)	Sound waves cannot travel through: b) Air                                    b) Water c)  Material medium      d) Vacuum	D
5)	Sound waves do not travel in vacuum   because    a) They are transverse waves    b) They are stationary waves    c) They require material medium for   propagation    d) They do not have enough energy	C
6)	The velocity of sound in vacuum is:    a) 332 𝑚𝑠 −1                    b) 333 𝑚𝑠 −1    c) 280 𝑚𝑠 −1                     d) 0 𝑚𝑠 −1	D
7)	The speed of sound in air at 0°𝐶 is   332 𝑚𝑠 −1 . the speed at 2°𝐶 will be:    a) 330 𝑚𝑠 −1                     b) 333.2 𝑚𝑠 −1    c) 335 𝑚𝑠 −1                     d) None of these	B
8)	According to Laplace correction sound   travel in air under the conditions of    a) Adiabatic                       b) Isothermal    c) Isobaric                          d) Isochoric	A
9)	Laplace expression for speed of sound in a   gase is: b)  𝑣 =                              b)  𝑣 = c)   𝑣 =                            d)  𝑣 =	C
10)	If the pressure of the gas is doubled, then     the speed of sound:     a) Also doubled     b) Becomes half     c) Not affected     d) Increases four times	C
11)	The speed of sound in air at 30°𝐶 is    approximately equal to:     a) 332 𝑚𝑠 −1                     b) 335 𝑚𝑠 −1     c) 340 𝑚𝑠 −1                     d) 345 𝑚𝑠 −1     e) 350 𝑚𝑠 −1	E
12)	Increase in velocity of sound in air for 1°𝐶    rise in temperature is:     a) 0.61 𝑚𝑠 −1                    b) 61 𝑚𝑠 −1     c) 1.61 𝑚𝑠 −1                    d) 2 𝑚𝑠 −1	A
13)	The speed of sound is greater in solids    than in gases due to high value of:     a) Density                           b) Pressure     c) Elasticity                       d) Temperature	C
14)	The distance between any two consecutive    crests or troughs is called     a) Frequency                                    b) Period     c) Wave length                 d) Phase difference	C
15)	When two identical waves moves in the    same direction, they give rise to:     a) Standing waves          b) Interference     c) Beats                               d) None of these	B
16)	When path difference is an integral    multiple of wavelengths, the effect is    called:     a) Coherency     b) Destructive interference     c) Constructive interference     d) Phase lag	C
17)	Periodic alteration of sound between    maximum and minimum loudness are    called     a) Interferece                   b) Resonance     c) Doppler effect             d) Beats	D
18)	Beats can be heard when the difference of    frequency is not more than:     a) 8                                        b) 4     c) 10                                     d) 6	C
19)	Beats are formed when two notes of    frequencies 𝑓1 and 𝑓2 (𝑓1 > 𝑓2 ) are    sounded together. The beat frequency will    be:     a) 𝑓1 + 𝑓2                           b) 𝑓1 − 𝑓2     c)                                            d)	B
20)	The number of beats produced per second    is equal to     a) The sum of the frequencies of two     tuning forks     b) The difference of the frequencies of     two tuning forks     c) The ratio of the frequencies of two     tuning forks     d) The frequency of either of the two     tuning forks	B
21)	When a wave is reflected on going from a    rarer to a denser medium, then at the    boundary the reflected wave will undergo    a phase change of:     a) 0o                                     b) 90o     c) -90o                                 d) 180o	D
22)	When a transverse wave is reflected on    going from a denser to a rarer medium,   then at the boundary the reflected wave    undergoes a phase change of:     a) 0°                                      b) 90°     c) −90°                                 d) 180°	A
23)	When a transverse wave is reflected on    going from a denser medium to a rare    medium, then:     a) There is 180° phase shift     b) There is no change in phase     c) A crest is converted into trough     d) A trough is converted into crest	B
24)	Phase differce of 180° is equivalent to a    path difference of:     a) 𝜆                                    b) λ/2    c)  λ/4                               d) λ/8	B
25)	Two waves of equal frequency travelling    in opposite direction produce:     a) Interference             b) Stationary waves     c) Beats                           d) Doppler Effect	B
26)	Two wave trains of the same amplitude    and frequency travelling in opposite    directions along the same path in the same   medium produce: a. Resonance                     b.Beats c.Standing waves            d. Musical notes	C
27)	Which property of wave motion    distinguish a travelling wave from a    stationary wave:     a) amplitude     b) frequency of vibration     c) propogation of energy     d) direction of vibration	C
28)	If a string vibrates in n loops, the  wavelength of stationary waves will be b) 2l/n                                 b) nl/2 c)  2n/l                                 d) l/2n	A
29)	Stationary waves are generated on a string            of length “l”, its fundamental frequency is    given by:     a) 𝑓1 = 𝑣 × 𝑙                        b) 𝑓1 = 2v/𝑙     c) 𝑓1 = 2 𝑣 × 𝑙                    d) 𝑓1 = 2l/𝑣	B
30)	The fixed ends of a vibrating string are     a) antinodes     b) nodes     c) overtones     d) neither nodes nor anti-nodes	B
31)	At the open end of an organ pipe:     a) Nodes are formed     b) Antinodes are formed     c) Either nodes or antinodes may form     d) Neither nodes nor antinodes may	B