### Oscillations, oscillary motion, fundamental , periodic motion, harmonic motion.

Explore the intriguing realm of oscillations on Nokryan.com, where clarity intersects with discovery. Starting with “Oscillations,” we demystify the essential occurrence of periodic motion, laying the foundation for in-depth exploration. Progressing seamlessly into “Oscillatory Motion,” we investigate the complexities of objects moving to and from around a central point, establishing the basis for comprehending harmonic motion. Moving on, we immerse ourselves in “Fundamental Periodic Motion,” bringing to light the basic oscillatory patterns observed in various systems, from pendulums to springs. As we continue our exploration, “Periodic Motion” unveils the diverse expressions of repetitive movement in nature, emphasizing its prevalence in our surroundings. At Nokryan.com, our goal is to elucidate these intricate concepts.

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