Tag: physics

Questions Related to physics

State whether true or false.
All periodic motion need not be oscillatory but all oscillatory motions
are periodic.

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Any motion that repeats itself at regular intervals of time is periodic in
nature (e.g., motion of a planet around the sun) but it is not necessarily
oscillatory But all oscillatory motions undergo periodic repetitions hence 
are always periodic

If a body moves back and forth repeatedly about a mean position, it is said to possess 

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. rotatory motion

  2. projectile motion

  3. oscillatory motion

  4. Reciprocating motion

Show answer
Correct Option: C
Explanation:

Oscillation is the process of swinging or moving to and fro in a steady, uninterrupted manner, and oscillatory motion is the movement created by the process.

In the equations below, A, B, $\omega$ and $\phi$ are constants; $y$ and $t$ are variables; $t$ represents time. Only one of the following equations does not represent SHM. Which one is that?

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. $y= A sin \omega t$

  2. $y= B cos \omega t$

  3. $y= A sin \omega t + B cos \omega t$

  4. $y= A sin \omega t + B cos (2\omega t)$

Show answer
Correct Option: D
Explanation:

A linear combination of coherent simple harmonic motions would result in another simple harmonic motion.

But the combination of two incoherent simple harmonic motions($Asin\omega t,B cos(2\omega t)$) is NOT an SHM.
Hence the answer is option D.

Which of the following is not an oscillatory motion?

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. The tuning fork

  2. The stretched string

  3. The motion of the swing

  4. None of the above

Show answer
Correct Option: D
Explanation:

Oscillation is a motion in which a body moves back and forth repeatedly about a mean position. Since in all the first 3 options, the motion is oscillatory, the correct option is 'None of these'.

Swinging of table fan is an example of which type of motion?

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. Oscillatory motion

  2. One dimenetional motion

  3. Projectile motion

  4. None of the above

Show answer
Correct Option: A
Explanation:

Any motion in which the body moves to and fro repeatedly is known as oscillation. A table fan swings with a specific time period and constantly moves to and fro.  Hence it is oscillatory motion

Which of the following is/are not periodic motion?

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. The motion of the bob of the simple pendulum

  2. Motion of a bouncing ball under the action of gravity and friction

  3. Motion of a planet around the sun

  4. Both A and B

Show answer
Correct Option: B
Explanation:

A periodic motion is the one which repeats itself at fixed intervals of time.

A bouncing ball doesn't bounce to the same height everytime. Hence we can't say that the motion is repeating.

Displacement-time graph depicting an oscillatory motion is

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. cos curve

  2. sine curve

  3. tangent curve

  4. straight line

Show answer
Correct Option: B
Explanation:

The equation for displacement in oscillation is $x=A\sin(\omega t+\alpha)$

Since $x$ is a sine function of time, the graph is sinusoidal in nature.

Uniform circular motion can also be represented by a simple harmonic oscillator.
State whether given statement is True/False?

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

The above statement is true as we can represent uniform circular motion by simple harmonic oscillator.

The bye-bye gesture, we do using hands is an example of 

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. Periodic motion

  2. Oscillatory motion

  3. Linear motion

  4. Circular motion

Show answer
Correct Option: B
Explanation:

The motion of the hand is an oscillatory motion, as the motion repeats in a finite interval of time and the to and fro motion happens in a given time period

As the hand moves to one extreme, a restoring force acts in the opposite direction to move it back to the mean and then to the other extreme position. Thus, the bye-bye gesture of the hand is an oscillating motion


The correct option is (b)

"The motion of a particle with a restoring force gives oscillatory motion". Which of the following forces can be a restoring force for the oscillatory motion.

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. Frictional force

  2. A constant force F

  3. A time varying force opposite to direction of motion

  4. Force due to a spring

Show answer
Correct Option: D
Explanation:

Frictional force is a constant force acting opposite to the direction of motion
A constant force only makes an object to move in one direction
A time varying force makes an object to move in one direction with its speed increasing
Force due to a spring, keeps varying, as the object is moved away from its mean position and thus acts as a restoring force

The correct option is (d)