Tag: the essence of change

Questions Related to the essence of change

Muscular energy is form of chemical energy. 

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

  1. True

  2. False

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Correct Option: A

What energy does the person possess while climbing a hill?

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

  1. Potential Energy

  2. Kinetic Energy

  3. Only muscular energy

  4. Both (A) and (B)

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Correct Option: D
Explanation:

Both potential energy (due to going up against the force of gravity) and kinetic energy (because of movement of the body).

A fish swimming in water possess mechanical energy.

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

  1. True

  2. False

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Correct Option: A

Energy stored in the bonds of molecules is a form of:

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

  1. heat energy

  2. potential energy'

  3. chemical energy

  4. light energy

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Correct Option: C
Explanation:

The Energy that gets released when the bonds are formed was stored in the electromagnetic fields inside of the atom. When the bond is formed, the electrons and protons assume a configuration that has an, overall, less intense combination of electric and magnetic fields inside of the bonded atoms than when they were separate. 

A body $A$ is placed on a railway platform and an identical body $B$ in a moving train. Which of the following energies of $B$ are greater than those of $A$ as seen from the ground?

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

  1. Kinetic

  2. Total

  3. Mechanical

  4. Internal

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Correct Option: A,B,C
Explanation:

Since the body B is in a moving train, it will have higher kinetic energy as compared to the body on platfrom. It is because the speed of the body $A$ is zero.

The total energy of the body $B$ will be more than body $A$ due to its state of motion and the mechanical energy of the body $B$ will be higher due to more amount of work done on it as it is moving.

The internal energy of the two identical bodies do not depend on other external factors and it remains constant for the bodies.

So, only the internal energy will not change.

A helicopter takes off from the ground and rises vertically. It then hovers at a constant height
above the ground.
Which sequence of energy changes takes place during the gain in height?

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

  1. $Chemical \rightarrow gravitational\ potential\rightarrow kinetic$

  2. $Chemical \rightarrow kinetic \rightarrow gravitational\ potential$

  3. $Gravitational\ potential \rightarrow chemical \rightarrow kinetic$

  4. $Kinetic \rightarrow chemical \rightarrow gravitational\ potential$

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Correct Option: B
Explanation:

First the fuel in the engine gives chemical energy during burning. That chemical energy then converts to kinetic energy if the rotor of blades of the helicopter. Then kinetic energy converts in gravitational potential energy as it gains height.

The plants trap solar energy in the form of :

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

  1. physical energy

  2. chemical energy

  3. heat energy

  4. light energy

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Correct Option: B
Explanation:

When sunlight falls on plant, some of the energy is trapped through
photosynthesis and is stored in the form of chemical energy which helps the plants to prepare their own food.

Identify the energy changes in the following cases
$A$: A car moving up a hill.
$B$: Photographic film is exposed to sun-light.

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

  1. In $'A'$ mechanical energy in moving car is converted to kinetic energy and in $'B'$ potential energy is converted to chemical energy.

  2. In $'A'$ potential energy in moving car is converted to kinetic energy and in $'B'$ chemical energy is converted to light energy.

  3. In $'A'$ kinetic energy in moving car is converted to potential energy and in $'B'$ potential energy is converted to light energy.

  4. In $'A'$ kinetic energy in moving car is converted to potential energy and in $'B'$ light energy is converted to chemical energy.

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Correct Option: D
Explanation:

$A$: A car moving up a hill.
Moving car has kinetic energy, kinetic energy gets converted to potential energy as it gains height $(h)$.
And potential energy $=mgh$
$B$: Photographic film is exposed to sun -light.
When photographic film is exposed to Sun the silver bromide present in it decomposes, such that the film cannot be developed, here the light energy changes to chemical energy.

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

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

  1. Muscular energy to kinetic and heat energy

  2. Mechanical energy to chemical and light energy

  3. Chemical energy to Internal energy

  4. Rotational energy to muscular energy

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Correct Option: A
Explanation:

While riding a bicycle,the muscular energy of the rider gets transferred to heat energy and kinetic energy of the bicycle.Heat energy heats the rider's body.Kinetic energy provides a velocity to the bicycle to move in rotation.The transformation can be shown as:
Muscular energy$=$kinetic energy+heat energy
During transformation,the total energy remains conserved.

A ball falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.

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

  1. Potential energy

  2. Kinetic energy

  3. Heat energy

  4. None of the above

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Correct Option: B
Explanation:

After reaching the ground it will not have any height from the ground hence no potential energy as it is defined as virtue of state of its position where as it has velocity by which it can be said that kinetic energy exists as it is defined by virtue of state of its motion.While falling potential energy keeps on changing in kinetic energy and on reaching the ground all potential energy changes to kinetic energy.Hence there exists only kinetic energy.