MCQ on Dynamics

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MCQ on Dynamics. We covered all the MCQ on Dynamics in this post for free so that you can practice well for the competitive exam that covers the dynamics syllabus.

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Dynamics MCQ for School Students

The time taken by a body for four complete revolutions is 4T seconds and for one complete revolution is T seconds, The motion of the body is

1. circular motion

2. elliptical motion

3. uniform circular motion

4. None of these

Option 3 – uniform circular motion

The time period (T) of a body in uniform circular motion, is

1. different for different revolutions

2. same for any revolution

3. not predicted

4. None of these

Option 2 – same for any revolution

The angle through which the radius vector rotates in a given time is called its

1. angular velocity

2. angular displacement

3. angular acceleration

4. angular speed

Option 2 – angular displacement

The units of angular displacement are ( MCQ on Dynamics )

1. degrees

2. minutes

3. seconds

4. radians

Option 4 – radians

The rate of change of angular displacement is called……

1. angular velocity

2. angular momentum

3. velocity

4. None of these

Option 1 – angular velocity

The time taken by a body in rotatory motion to make one complete rotation is called

1. period of time

2. frequency

3. escaping time

4. None of these

Option 1 – period of time

The period of time ‘T’ of earth’s revolution, is

1.1 day

2. 1 year

3. 1 month

4. 1 week

Option 2 – 1 year

The period of time ‘T’ of moon’s revolution, is :

1.27.3 seconds

2. 27.3 hours

3. 27.3 x 24 x 60 x 60sec

4. 27.3 x 24 × 60 sec

Option 3 – 27.3 x 24 x 60 x 60sec

The reason for a particle moving along a circular path of radius ‘r’ and the centre ‘O’ to travel along the tangential line at every point on the path, is

1. inertia of rest

2. inertia of motion

3. inertia of direction

4. None of these

Option 3 – inertia of direction

The force which acts continuously on a particle initially moving with a linear velocity and makes it travel along a circular path is called centripetal force. The reason for being called so, is

1. the force acts normally to the direction of linear velocity (direction of tangential line)

2. the force acts always along the radius and towards the centre

3. the force acts normally on the particle at every point on the path

4. all of these

Option 4 – all of these

The centripetal force required for the earth to revolve round the sun, is

1. the gravitational force between the earth and the moon

2. the gravitational force between the earth and the Sun

3. the gravitational force between the Moon and the Sun

4. all of these

Option 2 – the gravitational force between the earth and the Sun

The centripetal acceleration required for a satellite to revolve round the planet, is

1. the gravitational force between the Sun and the planet

2. the gravitational force between the sun and the satellite

3. the gravitational force between the planet and the satellite

4. None of these

Option 3 – the gravitational force between the planet and the satellite

The centripetal force required for a stone suspended with a thread to the finger, to make rotatory motion, is

1. supplied by the thumb

2. supplied by the finger to which the thread is attached

3. supplied by the little finger

4. supplied by any finger

Option 2 – supplied by the finger to which the thread is attached

A block on a rotating frame is pulled a bit from the rim towards the centre of the rotation, it moves back again sticking to the rim, this is because

1. a force acting on it is pushing away from the centre

2. the centrifugal force acts on it

3. the centripetal force acts on it

4. (1) and (2)

Option 4 – (1) and (2)

The centripetal force required for the electrons to revolve round the nucleus of an atom, in

1. the electrostatic force between the electrons and the nucleus

2. the force of current electricity between the electrons

3. the magnetic force between the electrons and the nucleus

4. all of these

Option 1 – the electrostatic force between the electrons and the nucleus

The wooden block on a rotating frame being rest at the rim of the rotating frame, this is due to

1. the centripetal force acted by the rim on the block

2. the centrifugal force acting on the block to push it towards the centre

3. the equilibrium that exists between the centripetal force exerted by the rim on the block to push it towards the centre, and the centrifugal force tries to push the block away from the centre

4. all of these

Option 3 – the equilibrium that exists between the centripetal force exerted by the rim on the block to push it towards the centre, and the centrifugal force tries to push the block away from the centre

An imaginary co-ordinate system which is either at rest or in uniform motion and where Newton’s laws are valid is called an

1. inertial frame of reference

2. non-inertial frame of reference

3. rotating frame of reference

4. all of these

Option 1 – inertial frame of reference

An observer sitting in one of the two trains moving with same uniform velocity and adjacent to each there will not be able to detect the motion of the other trains. The imaginary co-ordinate system attached to one of the trains :

1. Newton’s laws of motion are not applicable

2. Newton’s laws of motion are applicable

3. Newton’s universal law of gravitation is applicable

4. Newton’s universal law of gravitation is not applicable

Option 2 – Newton’s laws of motion are applicable

The centrifugal force is a -in a non-inertial frame of reference

1. pseudo force

2. real force

3. fictitious force

4. None of these

Option 2 – real force

The centrifugal force is a ……. in an inertial frame of reference.

1. real force

2. fictitious force

3. both of these

4. none of these

Option 2 – fictitious force

The force acting on a body in circular motion is such that

1. it keeps the magnitude of ‘r’ remains constant without changing direction and magnitude of velocity of the object.

2. it changes the direction of velocity and the magnitude of ‘r’ without changing the magnitude of velocity.

3. if keeps the magnitudes of velocity and ‘r’ remains constant while changing the direction of velocity.

4. it keeps the direction of velocity and magnitude of ‘r’ remains constant while changing the magnitude of velocity.

Option 3 – if keeps the magnitudes of velocity and ‘r’ remains constant while changing the direction of velocity.

The direction of velocity of an object moving along a circular path having centre ‘O’ and radius ‘r’ at a point on its path, is

1. along the tangential line drawn to the circle at that point

2. along the line perpendicular to the tangent of the circle at that point

3. to the inside of the circular path

4. None of these

Option 1 – along the tangential line drawn to the circle at that point

The physical quantity which changes or tends to change the state of rest or the state of uniform motion of a body in a straight line is

1. inertia

2. force

3. mass

4. weight

Option 2 – force

The study of motion of a body under the action of a force is called

1. dynamics

2. kinematics

3. force

4. stress

Option 1 – dynamics

Which among the following causes motion in bodies? ( MCQ on Dynamics )

1. Inertia

2. Mass

3. Force

4. Stress

Option 3 – Force

If a body is moved along a straight line, then its motion is called as

1. translatory motion

2. rotatory motion

3. oscillatory motion

4. periodic motion

Option 1 – translatory motion

The motion possessed by a body executing a circular motion at any point on its circular path, is

1. linear motion

2. rotatory motion

3. oscillatory motion

4. None of these

Option 1 – linear motion

The motion executed by a simple pendulum in a wall clock, is

1. linear motion

2. rotatory motion

3. oscillatory motion

4. None of these

Option 3 – oscillatory motion

The motion of a wind mill is

1. vibratory motion

2. translatory motion

3. rotatory motion

4. None of these

Option 3 – rotatory motion

The motion of every particle on a body in rotatory motion, is

1. rotatory motion

2. translatory motion

3. vibratory motion

4. None of these

Option 1 – rotatory motion

A special case of rotatory motion, is

1. translatory motion

2. oscillatory motion

3. circular motion

4. None of these

Option 3 – circular motion

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