Tag: different forms of energy

Questions Related to different forms of energy

Which of the following devices does not convert electrical energy into sound energy?

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. A loud speaker

  2. A microphone

  3. A buzzer

  4. An electric bell

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Correct Option: B
Explanation:

A microphone converts sound energy into electrical energy. All other devices mentioned convert electrical energy into sound energy.

A battery, left idle (i.e., not in use):

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. converts chemical energy into electrical energy

  2. converts electrical energy into chemical energy

  3. converts electrical energy into light energy

  4. does no energy conversions

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Correct Option: D
Explanation:

When a battery is not in use, it does not give out electric current. So, the chemical energy stored in it does not get converted.

A running car converts:

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. chemical energy into mechanical energy

  2. mechanical energy into chemical energy

  3. potential energy into kinetic energy

  4. no energy

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Correct Option: A
Explanation:

A running car burns fuel and thus moves. So, it converts chemical energy into mechanical energy.

By charging a battery, we convert electrical energy into

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. heat energy

  2. chemical energy

  3. magnetic energy

  4. mechanical energy

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Correct Option: B
Explanation:

By charging a battery, we convert electrical energy into chemical energy. A battery, on the contrary, in use, converts chemical energy into electrical energy.

A loud speaker converts:

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. electrical energy into sound energy

  2. sound energy into electrical energy

  3. mechanical energy into sound energy

  4. sound energy into mechanical energy

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Correct Option: A
Explanation:

A loud speaker converts electrical energy into sound energy.

In the moving parts of a machine:

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. heat energy gets transformed into mechanical energy

  2. kinetic energy gets transformed into potential energy

  3. mechanical energy gets transformed into heat energy

  4. no energy transformation takes place

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Correct Option: C
Explanation:

The moving parts of a machine get heated due to friction, thus changing a part of mechanical energy into heat energy.

A thermocouple converts:

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. mechanical energy into electrical energy

  2. sound energy into electrical energy

  3. electrical energy into heat energy

  4. heat energy into electrical energy

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Correct Option: D
Explanation:

A thermocouple converts heat energy into electrical energy.

What are the various energy transformations that occur when you are riding bicycle?

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. Muscular $\rightarrow$ Kinetic $\rightarrow$ Heat

  2. Potential $\rightarrow$ Kinetic $\rightarrow$ Heat

  3. Kinetic $\rightarrow$ Heat $\rightarrow$ Sound

  4. None

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Correct Option: A
Explanation:

While paddling a bicycle muscular energy converted to kinetic energy as the bicycle moves.Rotation of wheel create friction causing loss of kinetic energy in the form of heat.

If $1kg$ of a substance is fully converted into energy , then the energy produced is  

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. $9 \times 10^{16}J$

  2. $9 \times 10^{24}J$

  3. $1J$

  4. $3 \times 10^{8}J$

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Correct Option: A

An anti-aircraft shell has been fired and it has a kinetic energy x. It explodes in the air. Then the sum of kinetic energies of all the particles is:

physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

  1. x

  2. more than x

  3. less than x

  4. zero

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Correct Option: B
Explanation:

During explosion, the chemical energy gets converted into kinetic energy. So, after explosion sum of kinetic energies of all the particles is greater than the initial kinetic energy.