MDCAT XI Physics Oscillations and Acoustics Online Test-2

Created on July 22, 2025 By

📚 Test Details

Subject: Physics
Class: 1st year / XI
Chapter: Oscillations and Acoustics
Test: 2
Book: Sindh Textbook
Total No. Of MCQs: 25 MCQs
Time Allowed: 25 Minutes

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1 / 50

1. When the source moves towards the observer, the relative wavelength is:

a) Lesser than actual wavelength

b) Greater than actual wavelength

c) Same as actual wavelength

d) Can't be determined

2 / 50

2. SHM is:

a) Vibratory but not periodic motion

b) Periodic but not vibratory motion

c) Periodic and vibratory motion

d) Vibratory but may be periodic or non-periodic

3 / 50

3. Beats are produced due to the superposition of waves having slightly different:

a) Wavelength

b) Amplitude

c) Frequency

d) All of these

4 / 50

4. If the potential energy of SHM at the midpoint between the mean and extreme position is 4 J, what is the total energy?

a) 8 J

b) 16 J

c) 32 J

d) 256 J

5 / 50

5. At what temperature will the velocity of sound in air be half of 859°C?

a) 273°C

b) 283°C

c) 273 K

d) 283 K

6 / 50

6. The direction of the restoring force is:

a) Always towards the point of equilibrium

b) Always away from the point of equilibrium

c) Different at different points

d) Can't be determined

7 / 50

7. If the density of air is increased 4 times:

a) Velocity of sound increases 4 times

b) Velocity of sound decreases 4 times

c) Velocity of sound increases 2 times

d) None of these

8 / 50

8. How many times is the potential energy (PE) of a body maximum during one complete cycle in SHM?

a) 1 time

b) 2 times

c) 3 times

d) 4 times

9 / 50

9. A bus has a horn frequency of 1000 Hz. A boy is standing on the road. If the bus is moving away from the boy with a velocity of 20 m/s, what apparent frequency is heard by the boy if the velocity of sound is 343 m/s?

a) 1000

b) 1061

c) 933

d) 945

10 / 50

10. The unit of the spring constant is:

a) N·s

b) N/s

c) N/m

d) None of these

11 / 50

11. The presence of moisture -------- speed of sound due to --------- in density.

a) Increases, increases

b) Increases, decreases

c) Decreases, increases

d) Decreases, decreases

12 / 50

12. If acceleration of a body executing SHM is 4 m/s² and velocity is 2 m/s, what is the frequency of SHM?

a) 0.1 Hz

b) 0.31 Hz

c) 3.14 Hz

d) 2 Hz

13 / 50

13. Choose the correct statement regarding sound waves:

a) At compression, temperature is greater

b) At rarefaction, pressure is greater

c) At rarefaction, temperature is greater

d) Both a and b

e) Both b and c

14 / 50

14. W is equal to:

a) k/m

b) m/k

c) √k/m

d) √m/k

15 / 50

15. Distance between adjacent antinodes in stationary waves is equal to:

a) Wavelength

b) Half of wavelength

c) 1/3 of wavelength

d) 1/4 of wavelength

16 / 50

16. Distance and displacement during one complete oscillation are equal to (where A shows amplitude):

a) 4A and 2A

b) 4A and 0

c) 0 and 4A

d) 0 and 0

e) Can’t be determined

17 / 50

17. Which of the following factors does not change relatively in Doppler effect?

a) Wavelength

b) Frequency

c) Velocity

d) None of these

18 / 50

18. Choose the correct statement regarding the mean position in SHM:

a) Acceleration is zero at mean position

b) Kinetic energy is zero at mean position

c) Velocity is zero at mean position

d) All of these

19 / 50

19. Speed of sound in air is independent of:

a) Temperature

b) Pressure

c) Density of air

d) None of these

20 / 50

20. Acceleration of a body in simple harmonic motion is 12 m/s² when it is displaced 2 m from the mean point. What is the acceleration of the same body if it is displaced 1 m from the mean position?

a) 6 m/s²

b) 12 m/s²

c) 24 m/s²

d) None of these

21 / 50

21. Speed of any wave depends on:

a) Energy

b) Frequency

c) Amplitude

d) Nature of Medium

22 / 50

22. Amplitude in SHM is directed:

a) Towards mean position

b) Away from mean position

c) Towards or away from mean position depending on the location of the particle

d) Can’t be determined

23 / 50

23. Standing waves are produced due to superposition of waves having:

a) Same amplitude

b) Same frequency

c) Moving in opposite direction

d) Both a and b

e) All of these

24 / 50

24. At any point in SHM:

a) Kinetic energy is conserved

b) Potential energy is conserved

c) Total energy is conserved

d) All of these

25 / 50

25. Doppler effect is not for:

a) Light waves

b) Matter waves

c) Sound waves

d) Both a and b

e) None of these

26 / 50

26. Choose the correct statement regarding restoring force

a) Restoring force is maximum at extreme position

b) Restoring force is maximum at mean position

c) Work done by restoring force is always zero

d) Both A and C

27 / 50

27. What is the ratio of kinetic energy to total energy at extreme position?

a) 1/1

b) 1/2

c) 2/1

d) 0

28 / 50

28. Doppler effect is used for apparent change in:

a) Amplitude

b) Velocity

c) Frequency

d) Loudness

e) All of these

29 / 50

29. If the amplitude of oscillation of a mass-spring system is doubled, then the time period of oscillation will be:

a) Halved

b) Doubled

c) Four times

d) Remain same

30 / 50

30. Maximum kinetic energy is equal to:

a) ½ KX²

b) ½ KX₀²

c) ½ K(X₀² – X²)

d) ½ K(X² – X₀²)

31 / 50

31. If the maximum amplitude of a mass-spring system is doubled, what will happen to the total energy?

a) It becomes doubled

b) It becomes halved

c) It becomes 4 times

d) It will remain same

32 / 50

32. A pendulum placed at one place for many years is damaged. It is moving slower than its actual time. If someone wants to correct it, what should they do?

a) Add more mass on pendulum

b) Remove some mass from pendulum

c) Increase the length of the string of the pendulum

d) Decrease the length of the pendulum

e) Can't be determined

33 / 50

33. What is the ratio of PE to KE at the midpoint of mean and extreme position?

a) 1:1

b) 1:2

c) 2:1

d) 1:3

34 / 50

34. For superposition of waves, waves should be of:

a) Same wavelength

b) Same frequency

c) Same nature

d) All of these

35 / 50

35. A body executing SHM has an acceleration of 9.8 m/s². After 2 seconds, what is the displacement of the body?

a) 1 m

b) 2 m

c) 9.8 m

d) 0 m

36 / 50

36. Particles in longitudinal waves vibrate:

a) In the same plane as the direction of motion of the wave

b) In a perpendicular plane to the direction of motion of the wave

c) Either A or B

d) Can't be determined

37 / 50

37. A mass shown in the figure is performing SHM between O (mean position) and X (extreme position). Suppose it is moving from point A to B. What is the displacement of mass at point B?

a) 2 cm

b) 3 cm

c) 5 cm

d) 10 cm

38 / 50

38. Doppler effect is independent of:

a) Speed of wave

b) Frequency of source

c) Distance between source and observer

d) None of these

39 / 50

39. Frequency of mass-spring system is independent of:

a) Mass of spring

b) Spring constant

c) Amplitude

d) All of these

40 / 50

40. Which of the following waves can propagate without a medium?

a) Light wave

b) Electromagnetic wave

c) Sound wave

d) Both a and b

e) Both a and c

41 / 50

41. When a source of sound is moving away from the observer, then sound waves appear to be moving:

a) Faster

b) Slower

c) same as if the source was at rest

d) Can't be determined

42 / 50

42. Interference of sound waves in time produces:

a) Mechanical wave

b) Stationary wave

c) Beats

d) None of these

43 / 50

43. A particle executing SHM has a maximum displacement of 1m. If the spring constant of the body is 20 N/m, what is the kinetic energy of the body at the midpoint between the mean and extreme positions?

a) 2.5 J

b) 7.5 J

c) 10 J

d) 11.5 J

44 / 50

44. In which waves do all particles vibrate with the same amplitude?

a) Progressive wave

b) Stationary wave

c) Both a and b

d) Can't be determined

45 / 50

45. When the speed of the source is greater than the speed of the sound wave, it will produce:

a) Doppler effect

b) Shock waves

c) Beats

d) Stationary waves

46 / 50

46. Kinetic and potential energies in SHM are equal when:

a) X = X₀

b) X = X₀ / √2

c) X = 2√2 X₀

d) X = √2 X₀

47 / 50

47. SHM is produced under the action of:

a) Restoring force

b) Stretching force

c) Both a and b

d) Can't be determined

48 / 50

48. If an organ pipe closed at both ends vibrates in the 2nd overtone, and the length of the pipe is 300 cm, what is the wavelength?

a) 100

b) 200

c) 300

d) 600

49 / 50

49. From the following graph, determine the amplitude and wavelength of the wave:

a) Amplitude =1, wavelength=2

b) Amplitude =2, wavelength=4

c) Amplitude =1, wavelength=6

d) Amplitude =2 , wavelength=6

50 / 50

50. A tuning fork is vibrating in the 3rd harmonic. The number of antinodes present in it is:

a) 3

b) 4

c) 5

d) 7

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MDCAT XI Physics Oscillations and Acoustics Online Test-2

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