Law of Conservation of Energy

Q.

What are the two different energies a free-falling body will have?

Q.

A steam engine converts the heat energy of steam into _________ energy.

Q. Energy flow in an ecosystem is unidirectional.

1. True
2. False

Q. How can we create 5 Joule of energy for our use?

1. By growing crops
2. By eating food
3. By sleeping
4. By no means

Q.

In a thermodynamic process, the pressure of a fixed mass of a gas is changed such that the gas releases 20 J of heat and 8 J of work is done on the gas. If the initial internal energy of the gas was 30 J, then what will the final energy be?

1. 2J

2. 58J

3. 18J

4. 42J

Q.

Which of the following statement is/are true for a freely falling body?

1. Potential energy and kinetic energy at any point during the free fall always remain constant.

2. Potential energy gets converted into kinetic energy progressively.

3. Sum of potential energy and kinetic energy at any point during the free fall remains constant.

4. Sum of potential energy and kinetic energy at any point during the free fall does not remain constant.