Tag: physics

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Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

Raindrops fall on earth with certain kinetic energy on the earth. From where do they get this energy ?

  1. Chemical energy

  2. Gravitational Potential energy

  3. Energy between molecules of water

  4. Heat energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As raindrops fall, they lose gravitational potential energy, which is converted into kinetic energy (ignoring air resistance for this conceptual question).

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

Water stored in a dam primarily possesses

  1. Heat energy

  2. Electrical energy

  3. Kinetic energy

  4. Potential energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Answer is D.

Potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.
There is potential energy stored in a water reservoir behind a dam. It is converted to kinetic energy when the water starts flowing down the penstock, from the dam. This kinetic energy is used to turn a turbine.
Hence, the water stored in a dam possesses potential energy.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

The form of energy that wood can be categorized into is:

  1. chemical energy

  2. electrical energy

  3. potential energy

  4. muscular energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

You'd burn it, just like you might burn coal or oil or natural gas. The stored energy in the wood is chemical energy, meaning that it can be released by a chemical reaction (burning). It's closely related to those fossil fuel energies, because the chemical energy was formed by photosynthesis, using energy from sunlight as the input.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

From the following statements find the one that is NOT correct:

  1. A flying bird has both potential and kinetic energy.

  2. A ball rolling on the ground has kinetic energy but no mechanical energy.

  3. A stretched rubber band has potential energy

  4. Chemical energy can be converted into electrical energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A body having either. Kinetic' energy or Potential energy or both is said to be having Mechanical energy.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

The flowing water of a river possesses ...... energy.

  1. gravitational

  2. potential

  3. electrical

  4. kinetic
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water, like many substances, contains two kinds of energy. The first kind of energy is called kinetic energy. This is energy that is used during the execution of processes, such as movement. Because of kinetic energy water can flow and waves can exist.
But water can also contain potential energy. This is energy that is stored in the water. Stored, but not used. This energy can become useful when water starts to flow. It will be transferred to kinetic energy and this will cause movement.
so it is clear that flowing water have kinetic energy .

so best possible answer is option D.