Physics [1 Mark Question Answer]

In what form is energy stored in a wrist watch?

Name the practical unit of power.

Name the physical quantity associated with the 'rate of doing work'.

Write the SI units of power.

What is meant by power?

Name the energy changes for each of the following cases:
dynamo

Name the energy changes for the following
human body

Name the energy changes for the following:
pendulum

Name the energy changes for the following:
bicycle brakes

Name the energy changes for the following:
electric ball

What kind of energy transformation takes place at a thermal power station?

Name the device that converts mechanical energy into electrical energy.

What is the work done when no net force is applied on the body?

What is the SI unit of work?

A boy does work when he pushes against a brick wall. (yes/no).

Work is the application of a ....... through a distance.

What is the work done against gravity when a body is moved horizontally along a frictionless surface?

What is the work done by the gravitational force of the earth on a satellite revolving around the earth?

Is work done a scalar or a vector physical quantity?

Can every force produce work?

Is power a scalar quantity?

Write an expression for the work done against gravity.

Write an expression for work done by a force depends?

Work done by a force is equal to the product of ....... and ....

What is the work done when the object acted upon by a force remains at rest?

What do you mean by a kilo joule?

What is the work done on a body by the gravitational force towards the centre of the path acting when it moves along a circular path?

Why is the work done on an object moving along a circular path zero?

What should be the angle between the directions of the displacement and the applied force so that the work done is zero?

When you move upstairs, do you perform some work?

State and define the SI unit of power.

What is the relation between 1 H.P. and 1 kW?

Can work done be zero even if force acts on the body?

A boy of mass m climbs up a staircase of vertical height h. What is the work done by the boy against the force of gravity? What would have been the work done if he uses a lift in climbing the same vertical height?

Give an example of the following uses of a machine:
to obtain gain in speed

Give an example of the following uses of a machine:
to change the direction of force

Give an example for each of the following uses of a machine:
to change the point of application of force

Give an example for each of the following uses of a machine:
to obtain gain in force,

Write the relation between mechanical advantage, velocity ratio and efficiency.

What is an ideal machine?

What is the use of a fixed pulley?

What is a single movable pulley? What is its mechanical advantage in the ideal case?

In a single fixed pulley, If the effort moves by a distance y downwards, by what height is the load raised?

In which direction will the force be applied when a single pulley is used with a mechanical advantage greater than unity?

Name a machine which is used to:
change the direction of force applied.

Name a machine which is used to:
multiply speed

Name a machine which is used to:
multiply force

Is the motion of moon around the earth in circular path an accelerated motion?