#### 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.

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

Given, distance (d) = 240 km Time (t) = 4 h Speed =?As, Speed = Distance/Time S = 240km/4hr = 60 km/h ∴The speed of the train, S = 60 kmph

#### 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.

#### 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.

#### 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.

#### 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.

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

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

#### 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.

#### 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.

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

When a ball is rolled on a frictionless plane surface, it moves with uniform speed because net external force on it is zero. It covers equal distances in equal intervals of time throughout its motion.

#### 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.

#### 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

#### Distance travelled = ____

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

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

Given, speed of the train = 60 kmph Distance covered by the train = 240 km Time (t) taken by the train to cover a distance of 240 km is =? S = Distance/Time 60=240/t ⇒ t = 240/60 ∴ t = 4 h Therefore, time (t) taken by the train to cover a distance of 240 km is 4 h.

#### ____ 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.

#### Parallactic second is the largest unit of

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

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

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

#### Pascal is the SI unit of

Pascal is the SI unit of stress.

#### 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.

#### 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 odometer.

#### 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.

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