General Wave Properties - Physics For Class X (Science Group) - MCQs, Fill in the blanks and Concept Map

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Unit 11: General Wave Properties

Multiple Choice Questions (MCQs)

Tick mark (✔) the correct answer:
1. A girl throws a small stone into a lake. Waves spread out from where the stone hits the water and travel to the bank of the lake. She notices that ten waves reach the side of the pond in a time of 5.0s. What is the frequency of the waves?
a) 0.50 Hz
b) 15 Hz
c) 2.0 Hz ✔
d) 50 Hz

2. Water waves can be used to show reflection, refraction, and diffraction. For each of these, which row shows whether or not the speed of the water waves changes?
Ans: (a)

-	Reflection	Refraction	Diffraction
a) ✔	Yes	Yes	Yes
b)	Yes	No	Yes
c)	No	Yes	No
d)	No	No	No

3. The diagrams show water waves that move more slowly after passing into shallow water. Which diagram shows what happens to the waves?
Ans: (c)

4. The diagram shows a water wave approaching a barrier with a gap.

The wave reaches point P. What is the name of the effect that causes he wave to reach point P?
a) Diffraction ✔
b) Dispersion
c) Reflection
d) Refraction

5. Water waves pass from deep into the shallow region and are then refracted. The characteristics of waves which will remain constant is:
a) direction
b) frequency ✔
c) speed
d) wavelength

6. Which is not a characteristic of a wave?
a) An amplitude
b) Period
c) Mass ✔
d) Velocity

7. When an oscillating object is in simple harmonic motion, its maximum speed occurs when the object is at its:
a) highest point
b) lowest point
c) equilibrium point ✔
d) extreme point

8. In an oscillating pendulum, the bob accelerates from its extreme position due to:
a) inertia
b) tension in the string
c) wind
d) gravitational force ✔

9. In the ball and bowl system, the mean position is at:
a) the earth
b) floor of the bowl
c) center of bowl ✔
d) extreme position

10. Oscillations are damped due to the presence of:
a) linear motion
b) restoring force
c) frictional force ✔
d) mechanical force

11. A wave transports this from one point to another point.
a) Matter
b) Energy ✔
c) Velocity
d) Amplitude

12. Waves that travel in a direction perpendicular to the direction of wave motion.
a) Sound waves
b) Longitudinal waves
c) Transverse waves ✔
d) None of them

13. Which one is NOT a transverse wave?
a) Water wave
b) Vibration in a guitar string
c) Electromagnetic wave
d) Sound wave ✔

14. It is the maximum displacement moved by a point on a vibrating body from the rest or mean position.
a) Amplitude ✔
b) Crest
c) Trough
d) Compression

15. SI unit of amplitude is:
a) second
b) meter / second
c) meter ✔
d) Hertz

16. It is a point on a surface wave where the displacement of the medium is at a maximum.
a) Amplitude
b) Crest ✔
c) Trough
d) Compression

17. Crest is:
a) negative / lower part of wave
b) negative / upper part of wave
c) positive / lower part of wave
d) positive / upper part of wave ✔

18. It is a point on a surface wave where the displacement of the medium is at a minimum:
a) Amplitude
b) Crest
c) Trough ✔
d) Compression

19. Waves that travel in a direction parallel to the direction of wave motion.
a) Electromagnetic waves
b) Longitudinal waves ✔
c) Transverse waves
d) None of them

20. Which one is an example of a longitudinal wave?
a) Water wave
b) Vibration in a guitar string
c) Electromagnetic wave
d) Sound wave ✔

21. This is a region where particles of a medium are closer together than average.
a) Rarefaction
b) Crest
c) Trough
d) Compression ✔

22. This is a region where the particles of a medium are further apart than average.
a) Rarefaction ✔
b) Crest
c) Trough
d) Compression

23. They do not need a medium for propagation.
a) Mechanical waves
b) Electromagnetic waves ✔
c) Sound waves
d) Water waves

24. Which one of them is an example of mechanical waves?
a) Sound waves
b) Water waves
c) Seismic waves
d) All of them ✔

25. Electromagnetic waves are comprised of:
a) transverse wave only ✔
b) longitudinal wave only
c) Both ‘a’ & ‘b’
d) None of them

26. Bouncing back of waves into the same medium by striking another medium surface is called:
a) reflection ✔
b) reflection
c) diffraction
d) None of them

27. Diffraction is only significant if the size of the gap is:
a) larger than the wavelength of the incident wave
b) smaller than the wavelength of the incident wave
c) about the same as the wavelength of the incident wave ✔
d) None of the above

28. The spreading of the waves near an obstacle is called:
a) reflection
b) refraction
c) diffraction ✔
d) None of them

29. What is the relation between frequency and time period of a wave?
a) f = T
b) f = ¹/_T ✔
c) f = 2T
d) f = ^T/₂

30. The SI unit of frequency is the:
a) second
b) meter
c) meter/sec
d) hertz ✔

31. The SI unit of wavelength is:
a) second
b) meter ✔
c) meter/sec
d) hertz

32. The speed of a wave can also be written as:
a) v = fƛ ✔
b) v = ^f/_ƛ
c) v = ^ƛ/_f
d) v = 2fƛ

33. Which expression represents the simple harmonic motion?
a) a ∝ 2x
b) a ∝ x
c) a ∝ -x ✔
d) a ∝ ¹/_x

34. Simple pendulum period is affected by: OR The period of a simple pendulum depends upon its:
a) length and gravity acceleration ✔
b) length and mass
c) mass and gravity acceleration
d) mass and amplitude

35. The period of a simple pendulum is independent of:
a) length and gravity acceleration
b) length and mass
c) mass and gravity acceleration
d) mass and amplitude ✔

36. The formula of time-period, T, for the simple pendulum executing SHM is:
a) 2π √g / l
b) 2π √l / g ✔
c) π √g / l
d) π √l /g

37. The waves that require a material medium for their propagation are called:
a) Matter waves
b) Electromagnetic waves
c) Mechanical waves ✔
d) All of them

38. The distance between any two consecutive crests or troughs is called:
a) frequency
b) time period
c) wavelength ✔
d) amplitude

39. The particles of the medium vibrate in longitudinal waves:
a) perpendicular to the direction of the wave motion
b) along the direction of wave motion ✔
c) opposite to the direction of the wave motion
d) do not vibrate at all

40. An example of mechanical waves is:
a) sound ✔
b) heat
c) light
d) All of them

41. A ripple tank is used to study the various forms of:
a) gases
b) solids
c) crystals
d) waves ✔

42. Which statement is TRUE for mechanical waves?
a) carry energy but do not need a medium
b) need medium but do not carry energy
c) carry energy and need a medium ✔
d) None of these

43. At the mean position of the pendulum, the potential energy of the pendulum is:
a) maximum
b) minimum ✔
c) zero
d) None of them

44. Shock absorbers in automobiles are one practical application of:
a) waves
b) SHM
c) damped motion ✔
d) None of these

45. The motion in which the friction reduces the mechanical energy of the system and the amplitude of motion reduces is called:
a) wave motion
b) SHM
c) vibratory motion
d) damped motion ✔

46. Time period is reciprocal of:
a) frequency ✔
b) amplitude
c) wavelength
d) pitch

47. The Water waves obey the laws of:
a) reflection & refraction
b) diffraction
c) Both ‘a’ & ‘b’ ✔
d) None of these

48. Which of the following device can produce both transverse and longitudinal waves?
a) A tuning fork
b) A slinky spring ✔
c) A ripple tank
d) A string

49. In Simple Harmonic Motion, the velocity at equilibrium position is:
a) maximum ✔
b) minimum
c) zero
d) constant

Fill In Blanks:
1. Up-and-down movements in the rope produce oscillations or vibrations.
2. A slinky is a pre-compressed helical or coiled spring.
3. A ripple tank is a glass tank of water used to demonstrate the basic properties of waves.
4. The particle movement is at right angles to the direction of the wave motion is a transverse wave.
5. A transverse wave is comprised of crest and trough.
6. The particle movement is in the same direction as the direction of wave motion, a longitudinal wave.
7. A longitudinal wave is comprised of compression and rarefaction.
8. The wave is a disturbance that transfers energy from one place to another.
9. Any substance that a wave can propagate through it is known as a medium.
10. Waves that transfer energy through matter are known as mechanical waves.
11. All mechanical waves travel through their media at different speeds depending upon the elasticity and inertial properties of the respective medium.
12. Waves that transfer energy, without the material medium are known as electromagnetic waves.
13. Ripple tank experiments demonstrate that water waves can be reflected, refracted, and diffracted.
14. When a wave enters from a region of deep water to a shallow, its wavelength and speed decrease.
15. The bending’of waves around obstacles or sharp edges is called the diffraction of waves.
16. When, an object oscillates about a fixed position its acceleration is directly Proportional to its displacement and is directed towards the mean position, its motion is called SHM.
17. A simple pendulum consists of a small metallic bob suspended from a light and in extensible string fixed at its upper end.
18. The period of a simple pendulum depends upon its length and acceleration due to gravity over that place.
19. An oscillating system in which friction has an effect is a damped system.
20. The amplitude of freely oscillating objects progressively decreases.