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Monday, 17 May 2021

Tamilnadu Samacheer Kalvi 5th Science Energy Solutions Term 1 Chapter 3 Energy


 

Tamilnadu Samacheer Kalvi 5th Science Solutions Term 1 Chapter 3 Energy

Samacheer Kalvi 5th Science Guide Energy Text Book Back Questions and Answers

I Choose the correct answer.

1. When diesel is burnt chemical energy is converted into ________

a) wind energy b) heat energy c) solar energy d) sound energy

2. Running water possesses ______

a) potential energy b) chemical energy c) kinetic energy d) sound energy

3. Unit of energy is ________

a) kilo gram b) newton c) kelvin d) joule

4. Which one of the following requires wind energy?

a) Bicycle b) Photosynthesis

c) Parachute d) Automobiles

5. Cow dung possesses ______

a) kinetic energy b) chemical energy

c) solar energy d) heat energy

4. Which one of the following requires wind energy?

a) Bicycle b) Photosynthesis

c) Parachute d) Automobiles

5. Cow dung possesses ______

a) kinetic energy b) chemical energy

c) solar energy d) heat energy

II. Find out the energy conversion that takes place in the following.

1. Iron box : Chemical energy ->Heat energy

2. Electric Iron box : _________ -> _________

3. Electric fan : _________ -> ___________

4. Speaker : _________ -> ___________

5. Generator : _________ -> ___________

II. Find out the energy conversion that takes place in the following.

1. Iron box : Chemical energy ->Heat energy

2. Electric Iron box : Electrical energy -> Heat energy

3. Electric fan : Electric Energy -> Mechanical Energy

4. Speaker : Electric Energy -> Sound Energy

5. Generator : Mechanical Energy-> Electric Energy

III. Find out the form of energy possessed by the following things.

1. A rock on the top of a hill

2. A rolling ball

3. Charcoal

4. Water falls

5. Battery

III. Find out the form of energy possessed by the following things.

1. A rock on the top of a hill: Potential Energy

2. A rolling ball : Kinetic Energy

3. Charcoal : Chemical Energy

4. Water falls : Kinetic Energy

5. Battery : Electric Energy

IV. Match the following.

Electric bell   -   Solar energy

Water in dam   -   Light energy

Solar heater   -         Electrical energy

Wind mill   -     Potential energy

Torch light   -   Sound energy

IV. Match the following.

Electric bell   -   Solar energy

Water in dam   -   Light energy

Solar heater   -         Electrical energy

Wind mill   -     Potential energy

Torch light   -   Sound energy

V. Say True or False.

1. An apple falling from a tree is an example for kinetic energy.

2. Electrical energy is used to run electric trains.

3. Heat energy cannot be produced by friction.

4. Potential energy and heat energy are the two forms of mechanical energy.

5. The unit of energy is joule.

V. Say True or False.

1. An apple falling from a tree is an example for kinetic energy.(True)

2. Electrical energy is used to run electric trains. .(True)

3. Heat energy cannot be produced by friction.(False)

4. Potential energy and heat energy are the two forms of mechanical energy. .(False)

5. The unit of energy is joule. .(True)

VI. Answer in brief.

1. What is energy?

2. What are the different forms of energy?

3. What are the uses of mechanical energy?.

4. State the law of conservation of energy.

5. Mention the uses of light energy.

VII. Answer in detail.

1. Explain the types of mechanical energy.

2. Explain conservation of energy.

1. What is energy?

In Science, energy is defined as capacity to do work.

2. What are the different forms of energy?

There are different forms of energy like a) Mechanical energy, b) Heat energy, c) Light energy, d) Wind energy etc

3. What are the uses of mechanical energy?

Uses of mechanical energy

qIn hydro electric plants, kinetic energy of water is converted into electrical energy.
qWind mills convert kinetic energy of winds into electrical energy.
qMechanical energy of the hammer is used to apply a force on a nail.
qMechanical energy can bring a moving body to rest and make a body at rest to move.

4. State the law of conservation of energy

Law of conservation of energy state, energy that  can either be created nor be destroyed.

One form of energy is converted into another form of energy.

This law was given by Julius Robert Mayer.

5. Mention the uses of light energy.

Uses of light energy

qWe are able to see objects with the help of light energy.
qPlants use light energy to synthesis their food.
qWith the help of light energy, our skin is able to synthesis Vitamin-D.
qElectricity can be produced with the help of light energy.

1.Explain the types of mechanical energy
qMechanical energy can be classified into two.
qKinetic energy
qPotential energy

Kinetic energy

Energy possessed by a moving object is known as kinetic energy. 
It is also known as energy of motion. 

Examples: Moving car, Cricket ball bowled by a player, Bullet coming out of a gun.

q

Potential energy

Energy possessed by an object which is at rest is known as potential energy.

 It is also known as stored energy of position. 

Examples: Object lifted above, Stone in the stretched rubber, Water in the dam.

2. Explain conservation of energy.

Energy cannot be created and it cannot be destroyed also. 

It is changed from one form to another form or transferred from one object to another object.

Example Water Dam: Water stored in water dams posseses potential energy.

When water falls down, potential energy of water is converted into kinetic  energy.

 Kinetic energy of water  rotates the turbines and electric energy is generated.

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