Class 10th Physics Unit 10 Simple Harmonic Motion and Waves MCQs Short Long Notes

physics 10th notes ch 10

1. The ratio of exerted force to displacement is called:

 
 
 
 

2. Christian Huygen invented the pendulum clock in:

 
 
 
 

3. If length of simple pendulum become double, its time period becomes:

 
 
 
 

4. High frequency wave carries:

 
 
 
 

5. The wave, in which the particles of medium move back and forth along the direction of propagation of waves:

 
 
 
 

6. At which position, the net force on bob is zero and the bob is stationary.

 
 
 
 

7. Time required to complete one cycle is called:

 
 
 
 

8. The maximum potential energy of a vibrating mass attached to a spring is at:

 
 
 
 

9. Wave equation is true for:

 
 
 
 

10. With the distance from the mean position, the magnitude of the restoring force:

 
 
 
 

11. The net force is zero when bob of simple pendulum is:

 
 
 
 

12. Highest points are:

 
 
 
 

13. At extreme position kinetic energy is:

 
 
 
 

14. Wave transfer:

 
 
 
 

15. Such waves which require medium for their production and propagation are called:

 
 
 
 

16. If the length of a simple pendulum is halved, its time period T will become:

 
 
 
 

17. Which one of the following is not example of SHM?

 
 
 
 

18. Lowest points are:

 
 
 
 

19. The time taken by vibrating body to complete one vibration is:

 
 
 
 

20. Electromagnetic waves consist of electric and magnetic fields oscillating:

 
 
 
 

21. In ball and bowl system the mean position is at:

 
 
 
 

22. The product of frequency and time period is equal to:

 
 
 
 

23. If the mass of bob of a simple pendulum is doubled, its time period:

 
 
 
 

24. Basic types of waves are:

 
 
 
 

25. In SHM, as the mass moves towards extreme position its speed:

 
 
 
 

26. The relation between the velocity frequency and wavelength of the wave is known as: 

 
 
 
 

27. Water and light waves are:

 
 
 
 

28. The force applied on a body is directly proportional to the change in length. This is:

 
 
 
 

29. Motion of mass attached to spring is an example of:

 
 
 
 

30. The displacement of an object in SHM when the kinetic and potential energies are equal is:

 
 
 
 

31. In SHM, the mass does not stop at the mean position but continues its motion due to:

 
 
 
 

32. In case of simple pendulum which component of weight acts as restoring force?

 
 
 
 

33. The to and fro motion of ball about mean position continues till all its energy is lost due to:

 
 
 
 

34. In SHM acceleration of vibratory motion is maximum at:

 
 
 
 

35. In SHM velocity of vibrating body is zero at:

 
 
 
 

36. The restoring force in case of ball and bowl system is:

 
 
 
 

37. The parts of longitudinal wave where loops of spring are far apart from each other:

 
 
 
 

38. Earthquake produces waves through the body of the Earth in form of:

 
 
 
 

39. In F = -kx , k indicates:

 
 
 
 

40. The period of a pendulum is independent of its:

 
 
 
 

41. The time period T of simple harmonic motion of a mass m attached to a spring is given by:

 
 
 
 

42. Heat and light waves are:

 
 
 
 

43. Which force always pushes or pulls the object performing oscillatory motion towards the mean position?

 
 
 
 

44. In SHM acceleration of vibrating body is always directed:

 
 
 
 

45. The speed of transverse waves as compared to the speed of longitudinal waves through solids, is:

 
 
 
 

46. A travelling disturbance is called:

 
 
 
 

47. The value of spring constant in case of soft springs is:

 
 
 
 

48. Ball and bowl system is an example of:

 
 
 
 

49. Electromagnetic waves consist of:

 
 
 
 

50. The region where pressure on the layer of air is more than surroundings:

 
 
 
 

51. Who developed first pendulum clock that could accurately measure time?

 
 
 
 

52. A human eardrum can oscillate in one second back and forth up to:

 
 
 
 

53. The distance between two consecutive crests and troughs is called:

 
 
 
 

54. Energy is transferred from one place of medium to the other in the form of:

 
 
 
 

55. Frequency and time period are:

 
 
 
 

56. Mathematically, S.H.M is represented as:

 
 
 
 

57. Which is example of simple harmonic motion?

 
 
 
 

58. In SHM velocity of vibrating body is maximum at:

 
 
 
 

59. The value of k depends upon:

 
 
 
 

60. Waves which do not require medium is called:

 
 
 
 

61. Number of vibrations completed in one second is called:

 
 
 
 

62. The region where pressure on the layer of the air is less than surrounding:

 
 
 
 

Short Questions

A ball is dropped from a certain height onto the floor and keeps bouncing. Is the motion of the ball simple harmonic? Explain.
Define Mechanical and Electromagnetic waves with example? 
Define Simple Harmonic Motion. Write conditions for SHM.
Define simple pendulum and time period of simple pendulum.
Define vibratory motion.
Differentiate between compression and rarefaction? 
Differentiate between crest and trough? 
Differentiate between mechanical waves and electromagnetic waves. 
Differentiate between time period and frequency in case of vibratory motion. 
Differentiate between transverse waves and compressional or longitudinal waves.
Draw a figure to show the Kinetic and Potential energy at different positions in a mass-spring system.
If the length of a simple pendulum is doubled, what will be the change in its time period?
Relate the speed of longitudinal and transvers waves through solid, liquid and gas.
State Hooke’s Law. Give its expression.
What types of waves do not require any material medium for their propagation?
What are the factors upon which the time period of simple pendulum depends?
What do you know about restoring force? OR Define restoring force.
What happens to the frequency of pendulum, as its oscillations dies down from large amplitude to small?
What is meant by oscillation?
What is meant by spring constant? 
What is second pendulum?
What is the displacement of an object in SHM when kinetic and potential energies are equal?
What is the frequency of second pendulum?
What will be the time period of simple pendulum at the center of the Earth?
Why does the pendulum lose time in summer and gains time in winter? 
With respect to simple pendulum, what is the difference between vibration and amplitude?

Long Questions

A simple pendulum completes one vibration in two seconds. Calculate its length, when g = 10.0 m s⁻² .
A pendulum of length 0.99 m is taken to the Moon by an astronaut. The period of the pendulum is 4.9 s. What is the value of g on the surface of the Moon?
A transverse wave produced on a spring has a frequency of 190 Hz and travels along the length of the spring of 90 m, in 0.5 s. the length of the spring of 90 m, in 0.5 s.
(a) What is the period of the wave?
(b) What is the speed of the wave?
(c) What is the wavelength of the wave?
A wooden bar vibrating into the water surface in a ripple tank has a frequency of 12 Hz. The resulting wave has a wavelength of 3 cm. What is the speed of the wave?
At one end of a ripple tank 80 cm across, a 5 Hz vibrator produces waves whose wavelength is 40 mm. Find the time the waves need to cross the tank.
Derive a relationship between velocity, frequency and wavelength of a wave. Write a formula relating of a wave to its time period and wavelength.
Distinguish between longitudinal and transverse waves with suitable examples.
Does increasing the frequency of a wave also increase its wavelength? If not, how are these quantities related?
Draw a transverse wave with an amplitude of 2 cm and a wavelength of 4 cm. Label a crest and trough on the wave.
Explain the following properties of waves with reference to ripple tank experiment:
a. Reflection b. Refraction c. Diffraction
Find the time periods of a simple pendulum of 1 metre length, placed on Earth and on Moon. The value of g on the surface of Moon is 1/6 of its value on Earth,
How can you Define the term wave? Elaborate the difference between mechanical and electromagnetic waves. Give examples of each.
If 100 waves pass through a point of a medium in 20 seconds, what is the frequency and the time period of the wave? If its wavelength is 6 cm, calculate the wave speed.
The time period of a simple pendulum is 2 s. What will be its length on the Earth?
What will be its length on the Moon if gm =ge /6? where ge = 10 ms⁻²
Think of several examples of motion in everyday life that are simple harmonic.
Water waves in a shallow dish are 6.0 cm long. At one point, the water moves up and down at a rate of 4.8 oscillations per second.
(a) What is the speed of the water waves?
(b) What is the period of the water waves?
Waves are the means of energy transfer without transfer of matter. Justify this statement with the help of a simple experiment.
What are damped oscillations. How damping progressively reduces the amplitude of oscillation?
What is simple harmonic motion? What are the necessary conditions for a body to execute simple harmonic motion?
What is the wavelength of the radiowaves transmitted by an FM station at 90 MHz? where 1M = 10⁶ , and speed of radiowave is 3 x 10⁸ ms⁻¹ .

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