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# Selina solutions for Concise Physics Class 7 ICSE chapter 3 - Energy [Latest edition]

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## Chapter 3: Energy

#### Selina solutions for Concise Physics Class 7 ICSE Chapter 3 Energy Exercise Objective Questions

Objective Questions | Q 1.1

Write true or false of the following statement.

A man going up has potential energy and kinetic energy both.

• True

• False

Objective Questions | Q 1.2

Write true or false of the following statement.

A gum bottle lying on a table has no energy.

• True

• False

Objective Questions | Q 1.3

Write true or false of the following statement.

In an electric fan, electrical energy changes into the mechanical energy.

• True

• False

Objective Questions | Q 1.4

Write true or false of the following statement.

Potential energy changes into kinetic energy when it is put to use

• True

• False

Objective Questions | Q 1.5

Write true or false of the following statement.

One form of energy cannot be converted into another form.

• True

• False

Objective Questions | Q 1.6

Write true or false of the following statement.

There is always some loss of energy in conversion from one form of energy to another form, so the total energy is not conserved.

• True

• False

Objective Questions | Q 1.7

Write true or false of the following statement.

The energy of flowing water can be converted into electric energy (electricity).

• True

• False

Objective Questions | Q 2.1

Fill in the blank

An electric fan converts electrical energy into ______ energy.

Objective Questions | Q 2.2

Fill in the blank

Cooking gas converts _______ energy into heat energy.

Objective Questions | Q 2.3

Fill in the blank

Energy possessed by a compressed spring is ______ energy.

Objective Questions | Q 2.4

Fill in the blank

The ability to do work is called ______

Objective Questions | Q 2.5

Fill in the blank

The energy possessed by a body due to its position is called ________ energy.

Objective Questions | Q 2.6

Fill in the blank

The energy possessed by a body due to its motion is called ______ energy.

Objective Questions | Q 2.7

Fill in the blank

Green plants convert _________ energy into chemical energy.

Objective Questions | Q 2.8

Fill in the blank

The S.I.unit of energy is ______

Objective Questions | Q 2.9

Fill in the blank

An object falling freely from the roof of a multistorey building has ________ and _________ energy when halfway down the building.

Objective Questions | Q 3

Match the following columns

 COLUMN A COLUMN B 1. Running water 1. heat energy 2. Burning 2. vibrations 3.Energy 3.atom bomb 4.Sound energy 4.kinetic energy 5.Nuclear energy 5.joule
Objective Questions | Q 4.1

Select the correct alternatives

When we rub our hands

• kinetic energy changes into potential energy

• mechanical energy changes into heat energy

• potential energy changes into kinetic energy

• heat energy changes into mechanical energy.

Objective Questions | Q 4.2

Select the correct alternatives

A ball rolling on the ground possesses

• kinetic energy

• potential energy

• no energy

• heat energy

Objective Questions | Q 4.3

Select the correct alternatives

The energy stored in an electric cell is

• chemical energy

• electrical energy

• heat energy

• mechanical energy.

Objective Questions | Q 4.4

Select the correct alternatives

When a bulb lights up on passing current, the change of energy is

• from electrical energy to heat energy

• from electrical energy to light energy

• from electrical energy to heat and light energy

• from electrical energy to mechanical energy.

Objective Questions | Q 4.5

Select the correct alternatives

The correct statement is

• Both work and energy have the same units

• Potential energy of a body is due to its motion

• Kinetic energy of a body is due to its position or state

• Kinetic energy can change into potential energy, but potential energy cannot change into kinetic energy.

Objective Questions | Q 4.6

Select the correct alternatives

According to law of conservation of energy, energy changes from one form to another form, but the total energy of that system

• increases

• decreases

• alternates

• remains the same

#### Selina solutions for Concise Physics Class 7 ICSE Chapter 3 Energy Exercise Short/Long Answer Questions

Short/Long Answer Questions | Q 1

Define the term energy.

Short/Long Answer Questions | Q 2

State the unit of energy and define it.

Short/Long Answer Questions | Q 3

Name five different forms of energy.

Short/Long Answer Questions | Q 4

What are the two kinds of mechanical energy.

Short/Long Answer Questions | Q 5

What is potential energy ? State its unit.

Short/Long Answer Questions | Q 6.1

Give one example of a body that has potential energy,  due to its position .

Short/Long Answer Questions | Q 6.2

Give one example of a body that has potential energy, in due to its state.

Short/Long Answer Questions | Q 7

State two factors on which the potential energy of a body at a certain height above the ground depends.

Short/Long Answer Questions | Q 8

Two bodies A and B of masses 10 kg and 20 kg respectively are at the same height above the ground. Which of the two has the greater potential energy ?

Short/Long Answer Questions | Q 9

A bucket full of water .is on the first floor of your house and another identical bucket with same quantity of water is kept on the second floor. Which of the two has greater potential energy ?

Short/Long Answer Questions | Q 10

Define the term kinetic energy. Give one example of a body which possesses kinetic energy.

Short/Long Answer Questions | Q 11

State two factors on which the kinetic energy of a moving body depends.

Short/Long Answer Questions | Q 12

Two toy-cars A and B of masses 500 g and 200 g respectively are moving with the same speed. Which of the two has the greater kinetic energy?

Short/Long Answer Questions | Q 13

A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same ?

Short/Long Answer Questions | Q 14

Name the form of energy which a wound up watch spring possess.

Short/Long Answer Questions | Q 15

Can a body possess energy even when it is not in motion ? Explain your answer with an example.

Short/Long Answer Questions | Q 16.1

Name the type of energy (kinetic or potential) possessed by the following:

A moving cricket ball.

Short/Long Answer Questions | Q 16.2

Name the type of energy (kinetic or potential) possessed by the following:

A stone at rest on the top of a building.

Short/Long Answer Questions | Q 16.3

Name the type of energy (kinetic or potential) possessed by the following:

A compressed spring.

Short/Long Answer Questions | Q 16.4

Name the type of energy (kinetic or potential) possessed by the following:

A moving bus.

Short/Long Answer Questions | Q 16.5

Name the type of energy (kinetic or potential) possessed by the following:

A bullet fired from a gun.

Short/Long Answer Questions | Q 16.6

Name the type of energy (kinetic or potential) possessed by the following:

Water flowing in a river.

Short/Long Answer Questions | Q 16.7

Name the type of energy (kinetic or potential) possessed by the following:

A stretched rubber band.

Short/Long Answer Questions | Q 17

Give one example to show the conversion of potential energy to kinetic energy when put in use.

Short/Long Answer Questions | Q 18.1

State the energy changes that occur in the following :

The unwinding of a watch spring.

Short/Long Answer Questions | Q 18.2

State the energy changes that occur in the following :

Burning coal while operating a steam engine.

Short/Long Answer Questions | Q 18.3

State the energy changes that occur in the following :

Lighting of a torch bulb.

Short/Long Answer Questions | Q 18.4

State the energy changes that occur in the following :

An electric generator (or dynamo).

Short/Long Answer Questions | Q 19

Energy can exist in several forms and may change from one form to another. Give two examples to show the conversion of energy from one form to another.

Short/Long Answer Questions | Q 20.1

Give one relevant example for the following transformation of energy:

Electrical energy to heat energy.

Short/Long Answer Questions | Q 20.2

Give one relevant example for the following transformation of energy:

Electrical energy to mechanical energy.

Short/Long Answer Questions | Q 20.3

Give one relevant example for the following transformation of energy :

Electrical energy to light energy.

Short/Long Answer Questions | Q 20.4

Give one relevant example for the following transformations of energy:

Chemical energy to heat energy.

Short/Long Answer Questions | Q 20.5

Give one relevant example for the following transformation of energy :

Chemical energy to light energy.

Short/Long Answer Questions | Q 21

What do you mean by conservation of mechanical energy? State the condition when does it hold.

Short/Long Answer Questions | Q 22

Give one example to show that the sum of potential energy and kinetic energy remains constant if friction is ignored.

Short/Long Answer Questions | Q 23.1

A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the highest point .

Short/Long Answer Questions | Q 23.2

A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is just in the middle .

Short/Long Answer Questions | Q 23.3

A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the ground.

Short/Long Answer Questions | Q 24

State the changes in form of energy while producing hydro electricity.

## Selina solutions for Concise Physics Class 7 ICSE chapter 3 - Energy

Selina solutions for Concise Physics Class 7 ICSE chapter 3 (Energy) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Physics Class 7 ICSE solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Concise Physics Class 7 ICSE chapter 3 Energy are Energy as Capacity to Do Work, Units of Energy (Joule and Calorie), Different Forms of Energy, Inter-conversion of Energy, Concept of Law of Conservation of Energy, Law of Conservation of Energy: Real World Examples.

Using Selina Class 7 solutions Energy exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 7 prefer Selina Textbook Solutions to score more in exam.

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