4th Science Guide Term 1 Lesson 3
4th Science Solutions Term 1 Chapter 3 Work and Energy
4th Standard Science Term 1 Lesson 3 Work and Energy Book Back Question and Answers Download PDf. 4th Science Term 1 English Medium Book in answers. 4th All Subject Book Back Answers.
4th Science Guide Work and Energy Text Book Back Questions and Answers
4th Science Guide Work and Energy Text Book Back Questions and Answers
I. Use the correct word to fill the blanks :
(Ramp, Simple machines, Work, Energy, Pulley)
- ___________ is said to be done when a force is acting on it.Answer:Work
Question 2.
The ability to do work is __________.Answer:Energy
Question 3.
___________ is a machine made up of wheel and rope.Answer:Pulley
Question 4.
____________ help us to make work easier.Answer:Simple machines
Question 5.
An example for inclined plane is ____________.Answer:Ramp
II. Rearrange the letters and find out the names of the tools :
Question 1.
Question 2.
Question 3.
III. Match the following :
Question 1.
IV. Classify the things below : (Text Book Page No. 109)
Question 1.
V. Answer the following :
Question 1.
What is the unit of energy?
Answer:
- The S.I. Unit of energy is the joule.
Question 2.
Name some simple machines.
Answer:
- Simple machines are pulley, wedge, inclined plane, screw, lever, wheel and axle.
Question 3.
What is a first order lever?
Answer:
- When the fulcrum is between the effort and the load, it is known as Class I lever.
- Example: scissors, pliers, seesaw.
Question 4.
Lemon juicer belongs to which type of lever? Why?
Answer:
- Lemon juicer belongs to Class II Lever. In a lemon squeezer, the lemon (load) is at the middle, the load is at the center of effort and fulcrum.
Question 5.
Define work.
Answer:
- An action in which one exerts a force to move an object is known as work.
Question 6.
Write any three types of energy.
Answer:
- Mechanical energy.
- Thermal energy.
- Chemical energy.
Samacheer Kalvi 4th Science Guide Work and Energy In Text Questions and Answers
Try to Answer (Text Book Page No. 104)
Observe the picture and put a tick ✓) if work is done and put a cross (x) if work is not done.
Question 1.
Let us do (Text Book Page No. 104)
Mention whether work is done or not in the following activity.
Question 1.
Try to Answer (Text Book Page No. 109)
Identify and mention the types of simple machines.
Question 1.
Let us do (Text Book Page No. 109)
Complete the table.
Question 1.
Try to Answer (Text Book Page No. 111)
Name the load, effort and fulcrum.
Question 1.
Samacheer Kalvi 4th Science Guide Work and Energy Additional Questions and Answers
I. Pick out the odd one :
Question 1.
Mechanical energy, Heat energy, Chemical energy, Food
Answer:Food
Question 2.
Scissors, broomstick, wrench, sea saw
Answer:Broomstick
Question 3.
petrol, coal, natural gas, water.
Answer:Water
II. Say true or false :
Question 1.
Chemical energy is one of the types of lever.
Answer:False
Question 2.
Simple machines usually exchange a larger force to move a heavy object.
Answer:False
Question 3.
The idea of a simple machine originated with the Greek philosopher Archimedes.
Answer:True
Question 4.
A lever is used to multiply the force.
Answer:True
III. Match the following :
Question 1.
- (b)
- (a)
- (d)
- (c)
IV. Choose the correct answer :
Question 1.
second order lever ___________.
(a) Scissors
(b) lemon squeezer
(c) Tongs
Answer:(b) lemon squeezer
Question 2.
Which of the following device converts chemical energy into electrical energy?
(a) Battery
(b) Loud speaker
(c) Solar cell
(d) Electric motor
Answer:(q) Battery
Question 3.
Which among the following is the non-renewable resources?
(a) Sun
(b) Wind
(c) Water
(d) Petrol
Answer:(d) Petrol
Question 4.
SI unit of energy is ______________.
(a) Joule
(b) kilogram
(c) Mass
(d) Watt
Answer:(a) Joule
Question 5.
A is a push or a pull
(a)Force
(b)Friction
(c) Simple machine
(d) pulley
Answer:(b) Friction
Question 6.
Simple machines makes work easier by trading _____________ for force.
(a) Motion
(b) Work
(c) Friction
(d) Distance
Answer:(b) Work
Question 7.
A force can cause an object to change its
(a) Shape
(b) Speed
(c) Direction
(d) All the above
Answer:(d) All the above
V. Fill in the blanks :
Question 1.
A ___________ should act on an object.Answer:Water
Question 2.
A pulley is a machine made up of a _____________.Answer:Wheel
Question 3.
_____________ is used to split materials.Answer:Wedge
Question 4.
The screw is used to raise _____________.Answer:Weights
Question 5.
The _____________ and sharpener are held together by screw.Answer:Blade
VI. Answer the following questions in one or two sentences :
Question 1.
What is non-renewable resources?
Answer:
The resources which are not easily replaced once used are called the non renewable resources.
Example: Petrol, Coal and Natural gas.
Question 2.
Write about Renewable resources.
Answer:
- Renewable sources of energy are replaced naturally over a period of time.
- We can keep using these sources for a long period of time. Since the beginning of human life, we have been using these resources.
- We use these resources for light, transport, cooking, heating. Eg: Sun, Wind and Water.
Question 3.
Write the two main conditions are needed for work to be done?
Answer:
Two main conditions are needed for work to be done.
- A force should act on an object.
- Object should move from one place to another.
Question 4.
What is work?
Answer:
An action in which one exerts a force to move an object is known as work.
Question 5.
Define energy?
Answer:
- Energy is defined as capacity for doing work.
- Energy must be transferred to an object in order to do work.
Question 6.
Write the type of energy.
Answer:
- Mechanical energy.
- Thermal energy
- Chemical energy
- Electrical energy
- Non-renewable energy
- Renewable energy
Question 7.
What is simple machine?
Answer:
- Simple machines are tools which are used to make our work easier.
- Some examples for simple machines are pulley, wedge, inclined plane,
Question 8.
Differentiate Class I lever and Class II lever.
Answer:
|
Class I lever |
Class II lever |
|
1. When the fulcrum is between the effort and the load, it is known as Class I lever. |
When the load is between the effort and the fulcrum, it is known as Class II lever. |
|
2. Example: scissors, pliers, seesaw. |
Example: wheel barrow, lemon squeezer, nut cracker. |
