Tag: physics

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

In the moving parts of a machine:

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

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

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

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

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

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
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.