1. Restoring force is the

- All of these
**correct** - Elastic force
- Opposing force
- Frictional force

2. One vibration means, the motion of mass from its

- Mean position to upper extreme position
- From mean position to back to its mean position
**correct** - All of these
- From extreme position to mean position

3. Frequency in the term used for

- None of these
- Number of vibrations for second
**correct** - Number of vibrations per minute
- Time to take one vibration

4. Angular frequency ‘ω’ is the characteristic of circular motion, with can be use to computer the value of

- A and B
**correct** - Instantaneous displacement
- Instantaneous acceleration
- Instantaneous velocity

5. The angle Θ gives the states of the system in its

- Position of the particle in a circle
- All of these
**correct** - Phase of vibration
- Vibrational cycle

6. In Hook’s law, K is the spring constant depending on the

- Applied force
- All of these
- Material of spring
**correct** - Dimensions of spring

7. The relation for instantaneous velocity v is

- None of these
- ω √x² – x₀²
- x₀ω/x √x₀ – x
- ω √x₀² – x²
**correct**

8. The body oscillates due to a

- Applied force
- Frictional force
- Restoring force
**correct** - None of these

9. The effective component of Vp or the velocity of the particle is given by

- Vp cos Θ
- All of these
**correct** - X₀ ω cos Θ
- Vp sin (90⁰ – Θ)

10. The relation for the displacement in SHM is

- x = x₀ cos (ωt + φ)
- x = x₀ cos ωt
**correct** - x = x₀ sin ωt
- None of these

11. The restoring force is always directed towards the

- Initial position
- Rest position or mean position
**correct** - All of these
- Final positions

12. The velocity of the body changes at different points. It is maximum at

- Between extreme and mean position
- None of these
- Extreme position
- Mean position
**correct**

13. The vibrating bodies produce

- Sound
- All of these
**correct** - Disturbance
- Waves

14. Some examples of typical vibratory motion are

- Mass suspended from a spring
- A steel ruler clamp at one end
- Bob of simple pendulum
- All of these
**correct**

15. Amplitude is the term defined for

- None of these
- Large distance
- Maximum displacement
**correct** - Small distance

16. The velocity of the body is zero at?

- None of these
- Between mean and extreme position
- Mean position
- Extreme position
**correct**

17. Oscillatory motion is a type of motion which is

- To and fro
- All of these
**correct** - Periodic motion
- Vibratory motion

Question was not answered18. Time period of a vibrating body is

- Time to take 1 vibrations
**correct** - None of these
- Time to take ½ vibration
- Time for 30 vibrations

19. Hook’s law is defined as

- None of these
- F and x are direct proportional
**correct** - F and x has no relation

F and x are inverse proportional

20. A simple harmonic motion in which the

- All of these
**correct** - Acceleration is directed towards the mean position
- Acceleration is directly proportional to displacement
- Acceleration produced is due to restoring force

**Entry Test 2021 Physics Oscillations MCQS Online Preparation Sample Paper 2 Questions with Answer**

1. Which one is initial phase in the relation x = x₀ sin (ωt +φ)

- (ωt + φ)
- None of these
- ωt
- φ
**correct**

2. When mass m = 0.05 kg and spring constant k = 245 kgs¯². Find the time period of the system

- 0.29sec
- 0.28 sec
**correct** - 0.20 sec
- 0.12 sec

3. When T = 1.0 sec and g = 9.8 ms¯². Find the length of the pendulum

- 0.83m
- 0.99m
- 0.25m
**correct** - 0.93m

4. The formula for the instantaneous velocity when friction is not considered

- V₀ = V √1 – x₀²/x²
- V = V₀ √1 – x² / x₀²
**correct** - None of these
- V = V₀ √1 – x₀²/x²

5. The potential energy at any instant is

- P.E. = ½ Kx
- P.E. = ½ Kx²
**correct** - None of these
- P.E. = ½ Kx₀²

6. The work done in stretching spring appears as elastic potential energy of the spring is?

- P.E. = ½ Kx₀²
**correct** - P.E. = ½ Kx²
- None of these
- P.E. = ½ K²x²

7. Consider the equation x = x₀ sin (ωt +φ). Find the phase angle

- ωt
- φ
- (ωt + φ)
**correct**

None of these

8. A block weighing 40 kg extends a spring by 0.16 m from its unscratched position. What is the value of K

- 201 kgs¯²
- 170 kgs¯²
- 245 kgs¯²
**correct** - 215kgs¯²

Question was not answered9. If we take initial phase as π/2 or 90⁰ , the displacement is

- x= x₀ cos (ωt + 90⁰)
- None of these
- x= x₀ sin (ωt + 90⁰)
- x= x₀ cos ωt
**correct**

10. In energy conservation, when spring is stretched slowly so that acceleration is

- Minimum
- Maximum
- None of these
- Zero
**correct**

11. Which component of weight balance the tension T in the string

- -mg cos Θ
- mg sin Θ
- mg cos Θ
**correct**

None of these

12. Work done in displacing the mass in through X₀ is

- W = ½ Kx₀
- W = ½ K x₀
**correct** - None of these
- W = ½ Kx²

13. A simple pendulum is defined as

- Small heavy mass
- All of these
**correct** - Friction less support
- Light inextensible string

14. According to relation S = r Θ, then Θ in simple pendulum is

- gX/l
- l/g
- g/l
- X/l
**correct**

15. The kinetic energy is maximum when mass at equilibrium

- P.E.max = ½ Kx²
- P.E.max = ½ Kx₀²
**correct** - P.E.max = ½ K²x
- None of these

16. The restoring force applied on the pendulum

- mg sin Θ
- -mg cos Θ
- -mg sin Θ
**correct** - mg cos Θ

17. The motion of a simple pendulum is SHM of Θ is

- None of these
- Large
- Very large
- Small
**correct**

18. When T = 1.0 sec and g = 9.8 ms¯². Find its frequency of such a pendulum

- 2 Hz
- 0.1 Hz
- 1 Hz
**correct** - 10 Hz

19. The maximum potential energy at the extreme position is

- P.E.max = ½ Kx²
- P.E.max = ½ K²x₀²
- None of these
- P.E.max = ½ Kx₀²
**correct**

20. The maximum value of mass spring system is

- None of these
- V₀ = X √x/m
- V₀ = x₀√K/m
**correct** - V = x₀ + √K/F

**Entry Test 2021 Physics Oscillations MCQS Online Preparation Sample Paper 3 Questions with Answer**

1. The damping effect for the pith-ball due to air resistance and for the lead ball is

- Much greater

correct - Lowest
- None of these
- Greater

2. The damped oscillations are produced due to

- All of these
**correct** - Frictional support of the system
- System friction
- Air resistance

3. The damping depends upon

- Sharpness
- Amplitude
- None of these
- Both
**correct**

4. In a resonance situation, the driving force may be

- Strong
- Feeble
**correct** - None of these
- Weak

5. Which of the following property/properties a system must have in order to execute simple harmonic motion?

- Inertia
- Elasticity
- Moment of inertia
- A and B
**correct**

6. The forced vibrations will take place when subjected to an

- Applied force
- External force
**correct** - Internal force
- None of these

7. A driven harmonic oscillator is the device in which, a physical system undergoes

- Powerful vibrations
- None of these
- Free vibrations
- Forced vibrations
**correct**

8. Resonance is a phenomenon in which external driving force is a periodic with period comparable to period of the oscillator which is

- Lowest period
- Highest period
- None of these
- Natural period
**correct**

9. At the frequency of 2450 MHz, the waves are absorbed due to resonance by

- Both
**correct** - Water molecules
- All of these
- Fat molecules

10. The frequency of these free oscillations is known as its

- None of these
- Maximum frequency
- Minimum frequency
- Natural frequency
**correct**

11. At resonance, the transfer of energy is

- Zero
- Minimum
- Minimum and maximum
- Maximum
**correct**

12. The frequency produced by the microwave oven is

- 2780 HZ
- 2450 Hz
- 2000 Hz
- 2450 MHz
**correct**

13. The energy of the oscillation comes from the

- Applied force
- Starting source
- Driving source
**correct** - None of these

14. The oscillations in which the amplitude decreases steadily with time are called

- None of these
- Sometimes undamped
- Damped
**correct** - Undamped

15. A body is said to be executing free vibrations when it oscillates when external force is

- Present
- Absent
**correct** - Some times absent
- None of these

16. The waves produced in microwave oven have a wavelength

- 11 cm
- 12 cm
**correct** - 11.5 cm
- 10 cm

17. The time period of a system executing simple harmonic motion depends upon

- Mass
- Amplitude
- Force constant
- B and C
**correct**

18. Find the distance through which the mass must be pulled down and then released with a velocity of 1.0 ms¯¹ and given that ω = 8.94 s¯¹

- 0.11 m
**correct** - 0.09 m
- 0.10 m
- 0.12 m

19. A spring of spring constant K = 80.0 Nm¯¹ and m = 1.0 kg. Find the value of ω

- 5.45 s¯¹
- 6.89 s¯¹

9.95 ¯¹- 8.94 s¯¹
**correct**

20. Under feeble driving force, the amplitude of the motion may become

- Starting source
- Applied force
- None of these
**correct** - Driving source