Physics [1 Mark Question Answer]

A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What happens to the mechanical energy after the ball hits the ground and comes to rest ?

A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What the kinetic energy of the ball just before it hits the ground ?

Name the type of energy possessed by the bob of a simple pendulum when it is at between the mean and extreme positions.

Name the type of energy possessed by the bob of a simple pendulum when it is at the mean position

Name the type of energy possessed by the bob of a simple pendulum when it is at the extreme position

A body falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.

A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.

A body falls freely under gravity from rest. Name the kind of energy it will possess at the point from where it falls.

A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?

Name two examples in which the mechanical energy of a system remains constant.

State the law of conservation of energy.

State the energy transformation on the following:
Electricity is obtained from nuclear energy.

State the energy transformation on the following:
Electricity is obtained from hydro energy.

State the energy transformation on the following:
Electricity is obtained from wind energy.

State the energy transformation on the following:
Electricity is obtained from solar energy.

Name two places in india where electricity is generated from nuclear power plants.

State the energy transformation on the following:
Electricity is obtained from solar energy.

How much hydroelectric power is generated in India?

What is hydro energy?

How much electric power is generated in India using the wing energy?

How is wind energy used to produce electricity?

What is wind energy?

Give one disadvantage of using a solar cell.

State whether a solar cell produces a.c. or d.c.

How much energy is gained by a box of mass 20 kg when a man
carrying the box waits for 5 minutes for a bus?

If the speed of a car is halved, how does its kinetic energy change?

A body of mass m is moving with a velocity v. Write the expression for its kinetic energy.

What do you understand by the kinetic energy of a body?

Name the form of energy which a body may possess even when it is not in motion. Give an example to support your answer.

Define the term potential energy of a body.

Name the type of energy (kinetic energy K or potential energy U) possessed in the following case:
A piece of stone places on the roof.

Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
An arrow shot out of a bow.

Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A stretched wire

Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A moving bus

Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A compressed spring

Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A moving cricket ball

Name the forms of energy which a wound-up watch spring possesses.

Is it practically possible to convert a form of energy completely into the other useful form? Explain your answer.

Name the process used for producing electricity using nuclear energy.

State the energy changes in the following case while in use:
a petrol engine of a running car

State the energy changes in the following case while in use:
an electromagnet.

State the energy changes in the following case while in use:
a ceiling fan

State the energy changes in the following case while in use:
an electric toaster.

State the energy changes in the following case while in use:
an electric cell in a circuit

State the energy changes in the following case while in use:
bio-gas burner

State the energy changes in the following case while in use:
a solar cell

State the energy changes in the following case while in use:
burning coal

State the energy changes in the following case while in use:
an electric bulb