Multiple choice questions of Chapter 8 of Physics for First Year.

1. Waves transmit ________ from one place to another.

a) Energy
b) Mass
c) Both
d) None

2. The waves that require a material medium for their propagation are called

a) Matter waves
b) Electromagnetic waves
c) Carrier waves
d) Mechanical waves

3. The example of mechanical waves is:

a) Water and air waves
c) Infrared waves
d) Ultra violet waves

4. Sound waves cannot travel through:

a) Air
b) Water
c) Material medium
d) Vacuum

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

6. According to Laplace correction sound travel in air under the conditions of
b) Isothermal
c) Isobaric
d) Isochoric

7. 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

8. The speed of sound is greater in solids than in gases due to high value of:
a) Density
b) Pressure
c) Elasticity
d) Temperature

9. The distance between any two consecutive crests or troughs is called
a) Frequency
b) Period
c) Wave length
d) Phase difference

10. When two identical waves moves in the same direction, they give rise to:
a) Standing waves
b) Interference
c) Beats
d) None of these

11. When path difference is an integral multiple of wavelengths, the effect is called:
a) Coherency
b) Destructive interference
c) Constructive interference
d) Phase lag

12. Periodic alteration of sound between maximum and minimum loudness are called
a) Interferece
b) Resonance
c) Doppler effect
d) Beats

13. Beats can be heard when the difference of frequency is not more than:
a) 8
b) 4
c) 10
d) 6

14. 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

15. 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

16. Phase differce of 180° is equivalent to a path difference of:
a) 𝜆
b) 𝜆 2
c) 𝜆 4
d) 𝜆 8

17. Two waves of equal frequency travelling in opposite direction produce:
a) Interference
b) Stationary waves
c) Beats
d) Doppler Effect
18. 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
19. 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
20. The fixed ends of a vibrating string are
a) antinodes
b) nodes
c) overtones
d) neither nodes nor anti-nodes
21. 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 form

22. A set of frequencies, which is multiple of fundamental frequency is called:
a) Beat frequency
b) Harmonics
c) Doppler frequencies
d) Nodal frequencies
23. The points of maximum displacement on a stationary wave is called
a) Anti-node
b) Node
c) Trough
d) Crest

24. In vibrating cord the points where the amplitude is zero, are called.
a) Antinodes
b) Nodes
c) Troughs
d) Crests
25. A distance between two consecutive nodes is:
a) 𝜆
b) 𝜆 2
c) 𝜆 4
d) 𝜆 8
26. Radar system is an application of:
a) Interferece
b) Beats
c) Stationary waves
d) Doppler effect
27. Stars moving towards the earth show:
a) Blue shift
b) Red shift
c) No shift
d) Longer wavelength
28. Which of the following does not have any effect on the speed of sound in gases?
a) Temperature
b) Density
c) Pressure
d) None of these
29. In a stationary wave, the particle velocity at the node is:
a) Maximum
b) Minimum
c) Zero
d) Constant

30. Doppler Effect applies to
a) Sound wave only
b) Light wave only
c) Both sound and light wave
d) Neither sound nor light wave

31. When the source of sound moves away from a stationary listener, then ___________occurs:
a) An apparent increase in frequency
b) An apparent decrease in frequency
c) An apparent decrease in wavelength
d) An apparent change in frequency

32. In open organ pipe
a) Only even harmonics are present
b) Only odd harmonic are present
c) Both even and odd harmonics are present
d) Selected harmonics are present