1. What is the oscillation known as if it can be expressed in terms of single harmonic function?

[A] Harmonic oscillation

[B] Functional oscillation

[C] Regular oscillation

[D] None of the above

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**Correct Answer:** A [Harmonic oscillation]

**Notes:**

Harmonic oscillation is that oscillation which can be expressed in terms of single harmonic function (i.e. sine or cosine function). Example :y =asin w t or y = acos w t

2. What is the S.I unit of frequency?

[A] Second

[B] Watt

[C] Hertz

[D] Joule

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**Correct Answer:** C [Hertz]

**Notes:**

The frequency is defined as the number of periodic motions executed by body per second. The S.I unit of frequency is hertz (Hz).

3. Which of the following represents angular frequency of a body?

[A] twice the frequency of the body

[B] product of frequency of the body with π

[C] half the frequency of the body

[D] product of frequency of the body with 3 π

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**Correct Answer:** A [twice the frequency of the body]

**Notes:**

Angular frequency of a body executing periodic motion is equal to product of frequency of the body with factor 2π. Angular frequency = 2 π n The unit of Angular frequency will be rad per second.

4. Which of these is a physical quantity which completely express the position and direction of motion of the particle?

[A] Frequency

[B] Displacement

[C] Phase

[D] Time period

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**Correct Answer:** C [Phase]

**Notes:**

Phase of a vibrating particle at any instant is a physical quantity, which completely express the position and direction of motion, of the particle at that instant with respect to its mean position.

5. What is the phase of a vibrating particle at t = 0 known as?

[A] epoch

[B] eon

[C] path difference

[D] period

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**Correct Answer:** A [epoch]

**Notes:**

Initial phase or epoch is the phase of a vibrating particle at t = 0. When t = 0; Phase is the angle of epoch.

6. When are the two particles said to be in same phase?

[A] if the phase difference between them is an even multiple of π

[B] if the path difference is an even multiple of (λ / 2)

[C] if the time interval is an even multiple of (T/ 2)

[D] All of the above

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**Correct Answer:** D [All of the above]

**Notes:**

Two vibrating particle are said to be in same phase, if the phase difference between them is an even multiple of π or path difference is an even multiple of (λ / 2) or time interval is an even multiple of (T/ 2).

7. Which of these is correct about Simple Harmonic Motion?

[A] Restoring force is directly proportional to the displacement from mean position

[B] Restoring force is equal to the displacement from mean position

[C] Restoring force is inversely proportional to the displacement from mean position

[D] Restoring force is half of the displacement from mean position

Show Answer

**Correct Answer:** A [Restoring force is directly proportional to the displacement from mean position]

**Notes:**

Simple harmonic motion is a special type of periodic motion, in which a particle moves to and fro repeatedly about a mean position under a restoring force which is always directed towards the mean position and whose magnitude at any instant is directly proportional to the displacement of the particle from the mean position at that instant. Restoring force Displacement of the particle from mean position.

8. Which of the following about S.H.M is correct?

[A] In S.H.M. acceleration is maximum at extreme position

[B] In S.H.M. velocity is minimum at extreme position

[C] Both a and b

[D] None of the above

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**Correct Answer:** C [Both a and b]

**Notes:**

In S.H.M: 1. acceleration is maximum at extreme position. 2. velocity is minimum at extreme position. 3. Direction of velocity is either towards or away from mean position depending on the position of particle.

9. In which of the following positions is the potential energy minimum in S.H.M?

[A] Extreme position

[B] Mean position

[C] can be at extreme or mean position

[D] None of the above

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**Correct Answer:** B [Mean position]

**Notes:**

Potential energy maximum and equal to total energy at extreme positions. Potential energy is minimum at mean position.

10. In which of the following positions is the kinetic energy maximum in S.H.M?

[A] Extreme position

[B] Mean position

[C] Can be at extreme or mean position

[D] None of the above

Show Answer

**Correct Answer:** B [Mean position]

**Notes:**

Kinetic energy is maximum at mean position and equal to total energy at mean position. Kinetic energy is minimum at extreme position.