Law of Conservation of Energy

Q.

Explain the energy transformations in television?

Q.

What kind of energy transformations take place when:

1. A candle is lit,
2. The engine of a car is started and it starts climbing up a hill road,
3. The food is digested in our body,
4. An electric bulb is switched on,
5. Food is cooked.

Q.

$60MJ$ energy is produced on combustion of $2kg$ of coal. Find how much energy is produced on burning $0.5kg$ of coal. Also, find the calorific value of coal.

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

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

Q. In a food chain, the flow of energy is always unidirectional.

1. True
2. False

Q.

Give any three examples of transformation of energy.

Q. Which law governs the energy conversion principle?

1. First law of thermodynamics.
2. Second law of thermodynamics.
3. Third law of thermodynamics.
4. No law states such principles.

Q.

Mention the various energy transformations that take place when we throw a ball.

Q. Activation energy

Q.

Internal combustion engines, nuclear reactors, hydroelectric power, tube lights, and gas stoves all are example to prove_______.

1. None of the above

2. Interconvertibility of energy

3. That we can create new energy

4. Non-interconvertibility of energy

Q. According to second law of thermodynamics ENERGY = WORK + HEAT + ___ .

1. Water
2. Wind
3. Nothing
4. Losses

Q.

definition of electronic energy, potentional energy , chemical energy, kinetic energy, light energy, heat energy

Q. Which of the following cation has highest hydration energy?

1. $Li$
2. $K$
3. $Na$
4. $H$

Q.

Complete the following sentence which highlight the way to reduce greenhouse effect.

Educating _________

Q. Energy can exist in several forms and may change from one form to another. For each of the following. slate the energy changes that occur in:
(a) the unwinding of a watch spring
(b) a loaded truck when started and set in motion
(c) a car going uphill
(d) photosynthesis in green leaves
(e) Clinging of a battery.
(f) respiration.
(g) burning of a match stick
(h) explosion of crackers.

Q.

What is meant by energy transformation.