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![Selina solutions for Concise Physics [English] Class 7 ICSE chapter 3 - Energy - Shaalaa.com](/images/concise-physics-english-class-7-icse_6:e046542b930449d498b216fad2b02edd.jpg "Selina solutions for Concise Physics [English] Class 7 ICSE chapter 3 - Energy")
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Solutions for Chapter 3: Energy
Below listed, you can find solutions for Chapter 3 of CISCE Selina for Concise Physics [English] Class 7 ICSE.
Selina solutions for Concise Physics [English] Class 7 ICSE 3 Energy Objective Questions
Write true or false of the following statement.
A man going up has potential energy and kinetic energy both.
True
False
Write true or false of the following statement.
A gum bottle lying on a table has no energy.
True
False
Write true or false of the following statement.
In an electric fan, electrical energy changes into the mechanical energy.
True
False
Write true or false of the following statement.
Potential energy changes into kinetic energy when it is put to use
True
False
Write true or false of the following statement.
One form of energy cannot be converted into another form.
True
False
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.
Write true or false of the following statement.
The energy of flowing water can be converted into electric energy (electricity).
True
False
Fill in the blank
An electric fan converts electrical energy into ______ energy.
Fill in the blank
Cooking gas converts _______ energy into heat energy.
Fill in the blank
Energy possessed by a compressed spring is ______ energy.
Fill in the blank
The ability to do work is called ______
Fill in the blank
The energy possessed by a body due to its position is called ________ energy.
Fill in the blank
The energy possessed by a body due to its motion is called ______ energy.
Fill in the blank
Green plants convert _________ energy into chemical energy.
Fill in the blank
The S.I.unit of energy is ______
Fill in the blank
An object falling freely from the roof of a multistorey building has ________ and _________ energy when halfway down the building.
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 |
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.
Select the correct alternatives
A ball rolling on the ground possesses
kinetic energy
potential energy
no energy
heat energy
Select the correct alternatives
The energy stored in an electric cell is
chemical energy
electrical energy
heat energy
mechanical energy.
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.
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.
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 [English] Class 7 ICSE 3 Energy Short/Long Answer Questions
Define the term energy.
State the unit of energy and define it.
Name five different forms of energy.
What are the two kinds of mechanical energy?
What is potential energy ? State its unit.
Give one example of a body that has potential energy, due to its position at a height.
Give one example of a body that has potential energy, in due to its state.
State two factors on which the potential energy of a body at a certain height above the ground depends.
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 ?
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 ?
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
State two factors on which the kinetic energy of a moving body depends.
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?
A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same ?
Name the form of energy stored in a wound up spring of a watch.
Can a body possess energy even when it is not in motion ? Explain your answer with an example.
Name the type of energy (kinetic or potential) possessed by the following:
A moving cricket ball.
Name the type of energy (kinetic or potential) possessed by the following:
A stone at rest on the top of a building.
Name the type of energy (kinetic or potential) possessed by the following:
A compressed spring.
Name the type of energy (kinetic or potential) possessed by the following:
A moving bus.
Name the type of energy (kinetic or potential) possessed by the following:
A bullet fired from a gun.
Name the type of energy (kinetic or potential) possessed by the following:
Water flowing in a river.
Name the type of energy (kinetic or potential) possessed by the following:
A stretched rubber band.
Give one example to show the conversion of potential energy to kinetic energy when put in use.
State the energy changes that occur in the following :
The unwinding of a watch spring.
State the energy changes that occur in the following :
Burning coal while operating a steam engine.
State the energy changes that occur in the following :
Lighting of a torch bulb.
State the energy changes that occur in the following :
An electric generator (or dynamo).
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.
Give one relevant example for the following transformation of energy:
Electrical energy to heat energy.
Give one relevant example for the following transformation of energy:
Electrical energy to mechanical energy.
Give one relevant example for the following transformation of energy :
Electrical energy to light energy.
Give one relevant example for the following transformations of energy:
Chemical energy to heat energy.
Give one relevant example for the following transformation of energy :
Chemical energy to light energy.
What do you mean by conservation of mechanical energy? State the condition when does it hold.
Give one example to show that the sum of potential energy and kinetic energy remains constant if friction is ignored.
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 .
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 .
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.
State the changes in form of energy while producing hydro electricity.
Solutions for 3: Energy
Selina solutions for Concise Physics [English] Class 7 ICSE chapter 3 - Energy
Shaalaa.com has the CISCE Mathematics Concise Physics [English] Class 7 ICSE CISCE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Selina solutions for Mathematics Concise Physics [English] Class 7 ICSE CISCE 3 (Energy) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. Selina textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Concise Physics [English] Class 7 ICSE chapter 3 Energy are Concept of Energy, Forms of Energy > Solar Energy, Electricity Generation using Hydroelectric Energy, Conversion of Energies, Principle of Conservation of Energy, Forms of Energy > Mechanical Energy, Mechanical Energy > Potential Energy (U), Mechanical Energy > Kinetic Energy (K), Conversion of Potential Energy into Kinetic Energy, Types of Kinetic Energy.
Using Selina Concise Physics [English] Class 7 ICSE solutions Energy exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Selina Solutions are essential questions that can be asked in the final exam. Maximum CISCE Concise Physics [English] Class 7 ICSE students prefer Selina Textbook Solutions to score more in exams.
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