#### When a ball is rolled on a frictionless plane surface, it moves with variable speed.

#### A car moving along a straight road is an example of ____ motion.

A car moving along a straight road is an example of rectilinear motion. When a body moves on a straight line path, its motion is said to be rectilinear motion.

#### A body is said to be in motion if there is a change in its position with ____.

A body is said to be in motion if there is a change in its position with time, with respect to a stationary object.

#### Speed is the product of total distance covered and the total time taken.

Speed is the total distance covered divided by the total time taken.

#### A man walking on a straight road is considered to be having ____ motion.

The motion on a straight plane is called linear motion. Hence, a man walking on a straight road is considered to be having linear motion.

#### If the speed of a body moving along a straight line keeps changing, it is said to possess ____ motion.

If the speed of a body moving along a straight line keeps changing, it is said to possess non-uniform motion.

#### The symbols of all units are written in ____.

The symbols of all units are written in singular. For example, we write 50 km and not 50 kms.

#### Which of the following is correct?

Speed of an object is defined as the distance covered divided by the time taken. ∴ Speed = Distance/Time

#### The distance moved by an object in unit time is called its ____.

The distance moved by an object in unit time is called its speed.

#### ____ motion of a pendulum has been used to make clocks.

Periodic motion of a pendulum has been used to make clocks, because of it's to and fro motion.

#### A train is running at a speed of 60 kmph. It will take ____ h to cover a distance of 240 km.

time (t) taken by the train to cover a distance of 240 km is 4 h.

#### The smallest time interval that can be measured with commonly available clocks and watches is ____ second.

The smallest time interval that can be measured with commonly available clocks and watches is, one second.

#### The instrument that measures the distance covered by the vehicles in motion is called as ____.

The instrument that measures the distance covered by the vehicles in motion is called as odometer.

#### Distance travelled = ____.

As, speed = distance/time ∴ Distance travelled = speed × time

#### A pendulum in a clock can be considered as a weight hung from a fixed point in such a way that it can swing freely.

A pendulum in a clock can be considered as a weight hung from a fixed point in such a way that it can swing freely.

#### A train is said to be in motion, if it is continuously changing its position with respect to a person at rest on the platform.

A train is said to be in motion, if it is continuously changing its position with respect to to a person at rest on the platform.

#### A body is said to be ____ if its position does not change with time.

A body is said to be at rest, if its position does not change with time.

#### The distance between two stations is 240 km. If a train takes 4 hours to cover the distance, the speed of the train is ____ kmph.

The speed of the train, S = 60 kmph

#### When you travel by a train or a car, the person sitting next to you is at motion with respect to you.

When you travel by a train or a car, the person sitting next to you is at rest with respect to you, but he is in motion with respect to the surroundings.

#### For a body moving with uniform speed along a circular path, the direction of motion of a body changes with ____.

For a body moving with uniform speed along a circular path, the direction of motion changes with time.

#### Which of the following system of units is not based on mass, length and time alone?

SI is based on seven basic units and two supplementary units.

#### The weight of a body is 30 gm. The statement made above is not correct because

Weight is a force. The unit of force is newton. Hence, weight should be expressed in newton.

#### Pascal is the SI unit of

Pascal is the SI unit of stress.

#### Parallactic second is the largest unit of

One parallactic second is the distance corresponding to a parallax 3.26 light year (approx.).

#### 'atto' is equal to 10x. The value of x in 10x is

Atto- (symbol a) is a prefix in the metric system denoting a factor of 10−18

#### Which of the following is not a unit of radiation?

The tesla (symbol T) is the SI derived unit of magnetic field B (which is also known as "magnetic flux density" and "magnetic induction").

#### The physical quantity which does not have its unit as pascal is?

The units of force are newton (N), kilogram weight (kg wt) whereas the rest have their unit as pascal.

#### The physical quantity which is both unitless and dimensionless is?

a, b and c are dimensionless but they have units. Option D is dimensionless and is also unitless because it is a ratio.

#### The correct symbol for kilowatt hour is?

The correct symbol for kilowatt hour is kWh.

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