# ICSE Class 9th Physics – Motion in one dimension MCQs

#### A body moving along a circular track of radius R completes one rotation in 2 seconds. Its average velocity in 2 second is ____ m/s.

The body completes one rotation in 2 second, so its displacement in 2 seconds is 0 m. Hence, the average velocity of the body in 2 seconds is 0 m/s.

#### The velocity-time graph for a body with non-uniform motion having constant acceleration is a ____.

The velocity-time graph for a body with non-uniform motion having constant acceleration is a straight line inclined to the time axis.

#### ____ is an example of random motion.

Bees flying is an example of random motion.

#### The oscillations made by a pendulum is an example of ____ motion.

The oscillations made by a pendulum are an example of vibratory motion.

#### The weight of a body is equal to the ____.

The weight of a body is equal to the product of its mass and the acceleration due to gravity at the place.

#### SI unit for the average velocity is ____.

Average velocity is defined as the ratio of total displacement and total time taken. SI unit of average velocity is m/s.

#### Which of the following is in motion?

Flying bird is in motion.

#### Vectors can be added, subtracted and multiplied by

laws of vectors

#### Vibratory motion is also termed as ____ motion.

Vibratory motion is also termed as oscillatory motion.

#### If a ball thrown up with a certain velocity attains a height of 40 m and comes back, then displacement of the ball is 80 m.

As initial position of the body when it starts its journey and final position of the body after its time of flight are same. Hence, the displacement of the ball is zero. Distance is the total length of the path which is 80 m.

#### A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. Then, the velocity of the particle is constant.

When a force is applied perpendicular to the velocity of the body, then the motion of the body is circular due to change in its direction at every point. Hence, the body moves with a constant speed and variable velocity.

#### If the quantity, position of a particle is represented using + and - signs then, the position is being expressed in

The signs indicate just the position of the place.

#### A car moving along a straight road is in ____ motion.

A car moving along a straight road is in rectilinear motion.

#### Acceleration due to gravity is a scalar quantity.

Acceleration due to gravity has both magnitude as well as direction. So, it is a vector quantity.

#### If the position of a body remains the same with time, it is said to be ____.

If the position of a body remains the same with time, it is said to be at rest.

#### Area under a velocity-time graph gives the ____ of the body.

Area under a velocity-time graph gives displacement of the body.

#### The motion of a train along a straight railway track is an example for

The straight line motion just specifies the distance travelled w.r.t time.

#### ____ is an example of rotational motion.

Motion of a fan is an example of rotational motion.

#### The weight of a body at the centre of the Earth is zero.

The value of acceleration due to gravity at the centre of the Earth is zero. Hence, the weight of a body at the centre of the Earth is zero.

#### Unit of acceleration is m/s2.

Unit of acceleration is m/s2.

#### Among the following which of the two are vectors?

The two types of vectors are polar and axial vectors.

#### The rate of displacement is ____.

Rate of change of distance is speed while, rate of displacement is velocity.

#### Which of the following is incorrect?

As speed has only magnitude but no direction, it is a scalar quantity. Velocity, retardation, acceleration due to gravity and displacement has both direction as well as magnitude. Hence, they are vectors.

#### The value of 'G' on Earth is greater than the value of 'G' on Jupiter.

The value of 'G' is constant, irrespective of the types of planets.

#### A body in uniform circular motion has ____.

In uniform circular motion, the magnitude of velocity of the particle is constant, but its direction changes with time. Hence, a body in uniform circular motion has constant speed.

#### Which of the following is the correct unit of acceleration due to the gravity in CGS system?

The unit of acceleration due to gravity in CGS system is cm/s2.

#### The wheel of a bicycle in motion is in ____.

The wheel of a bicycle in motion is in rotational motion.

#### Scalars is specified by number and units. Here the number represents its

Because Scalar has only magnitude

#### Motion of a child in a swing is ____ motion.

Motion of a child on swing is an oscillatory motion.

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