Energy Transformation

Q. When a bulb lights up when current is passed through it, the change of energy is from ________.

1. electrical energy to light energy only
2. electrical energy to heat energy only
3. electrical energy to heat and light energy
4. electrical energy to mechanical energy only

Q.

In a geyser, ____, giving us warm water.

1. Electrical energy transforms into heat energy

2. Heat energy transforms into mechanical energy

3. Mechanical energy transforms into electrical energy

4. Electrical energy transforms into mechanical energy

Q.

A man eats glucose and makes a block move, which then comes to rest after sliding on a rough floor. The correct order of energy changes can be:

1. heat - kinetic - chemical

2. Data insufficient

3. chemical - heat - kinetic

4. chemical - kinetic - heat

Q.

Solar panels are used for harnessing solar energy. This solar energy is then used to charge an electric cell and this electric cell is used to move a toy. What are the energy changes that take place?

1. solar energy- chemical energy- kinetic energy

2. chemical energy-kinetic energy-solar energy

3. Data insufficient

4. kinetic energy- solar energy-chemical energy

Q. When a person speaks in front of a microphone, the sound energy converts into:

1. Magnetic energy
2. Chemical energy
3. Light energy
4. Electrical energy

Q. Battery converts chemical energy into:

1. Electrical energy
2. Heat energy
3. Light enegy
4. Solar energy

Q. In case of a fan, the energy conversion is from ___.

1. chemical to electrical
2. mechanical to electrical
3. electrical to mechanical
4. heat to light

Q. The work done by gravitational force is path independent.

1. True
2. False

Q. An electrical appliance of $500W$ is used for $2$ hours per day. Calculate the energy consumed in a day.

1. 1

Q. The sum of potential energy and kinetic energy is always a constant.

1. False
2. True