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
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
Kinetic energy
Examples: Moving car, Cricket ball bowled by a player, Bullet coming out of a gun.
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.
தமிழ் கல்வி
No comments:
Post a Comment