Grade 5 | Science Notes - Energy | Unit-9
EXERCISE:
1. Fill in the blanks with correct words given below:
| chemical | non-renewable | solar | hydroelectricity |
| energy | electrical | sun | energy crisis |
a. Energy is the capacity to do work.
b. The solar cell stores solar energy.
c. The energy of running water is used to generate hydroelectricity.
d. Coal and petroleum are non-renewable sources of energy.
e. Bulbs convert electrical energy directly into light energy.
f. Sun is the ultimate source of energy.
g. Food has chemical energy in it.
h. Lack of essential energy for our use is called energy crisis.
Also Read:
Grade 5 | Science Notes - Animal Life | Unit-1
Grade 5 | Science Notes - Cell | Unit-2
Grade 5 | Science Notes - Life Cycle Of A Butterfly | Unit-3
Grade 5 | Science Notes - Life Process | Unit-5
Grade 5 | Science Notes - Effect of Human Activities on Environment | Unit-6
Grade 5 | Science Notes - Environment and its Conservation | Unit-7
Grade 5 | Science Notes - States of Matter | Unit-8
Grade 5 | Science Notes - Parts of a Flowering Plants | Unit-4
Grade 5 | Science Notes - Weather | Unit-10
Grade 5 | Science Notes - Energy | Unit-9.
Grade 5 | Science Notes - Clouds | Unit-11.
Grade 5 | Science Notes - The Universe | Unit-12.
Grade 5 | Science Notes - The Earth | Unit-13.
Grade 5 | Science Notes - Information and Communication | Unit-14.
Grade 5 | Science Notes - Common Local Technology | Unit-15.
Grade 5 | Science Notes - Cleanliness | Unit-16.
2. Write 'T' for true and 'F' for false statements.
a. The capacity of doing work is called energy. 'T'
b. The sun is the main source of energy. 'T'
c. Water, sun, wind are non-renewable sources of energy. 'F'
d. Electric bulbs convert heat energy into light energy. 'F'
e. We should not use biogas as the source of energy. 'F'
f. Solar cookers use energy from running water. 'F'
g. Magnetic energy is used for flying planes. 'F'
h. Sound energy is produced with the vibration of objects. 'T'
3. Select the best alternatives.
a. The capacity of doing work is called energy. (work/energy/power)
b. Plants is a renewable source of energy. (plants/petrol/gas)
c. Heat energy changes the state of matter. (heat/sound/light)
d. Burning iron is not an example of chemical energy. (wood/food/iron)
e. Objects producing light energy also produce heat energy. (sound energy/heat energy/magnetic energy)
f. Natural gas is an example of the non-renewable source of energy. (plants/animals/natural gas)
g. Solar energy is used for drying food grains. (solar energy/light energy/chemical energy)
h. Burning wood converts chemical energy into heat energy. (chemical/heat/light)
4. Match the following.
| A | B |
| Rice cooker | sound energy |
| Donkey carrying load | heat energy |
| Bread | muscular energy |
| Radio | chemical energy |
| Bulb | non-renewable energy |
| Ghatta | magnetic energy |
| Magnetic compass | running water |
| Coal | light energy |
Answer:
| A | B |
| Rice cooker | heat energy |
| Donkey carrying load | muscular energy |
| Bread | chemical energy |
| Radio | sound energy |
| Bulb | light energy |
| Ghatta | running water |
| Magnetic compass | magnetic energy |
| Coal | non-renewable energy |
5. Define the following terms.
a. Energy:- Energy is the capacity to do work.
#What do you mean by energy?
b. Renewable energy:- The sources of energy which can be renewed naturally are called renewable sources of energy.
#What do you mean by renewable sources of energy?
c. Heat energy:- The energy produced from red hot objects is called heat energy.
#What do you mean by heat energy?
d. Non-renewable energy:- The sources of energy which cannot be renewed are called non-renewable sources of energy.
#What do you mean by non-renewable energy?
e. Light energy:- The energy that makes things visible is called light energy.
#What do you mean by light energy?
f. Solar energy:- The energy produced by the radiation of the sun is called solar energy.
#What do you mean by solar energy?
g. Sound energy:- The energy produced due to the vibration of objects is called sound energy.
#What do you mean by sound energy?
h. Electrical energy:- The energy that is produced due to the flow of electrons is called electrical energy.
#What do you mean by electrical energy?
i. Magnetic energy:- Energy that is obtained from the magnet is called magnetic energy.
#What do you mean by magnetic energy?
j. Energy crisis:- Lack of essential energy is called energy crisis.
#What do you mean by energy crisis?
6. Answer the following questions.
a. Write down any three examples each of the renewable and non-renewable sources of energy.
Answer: The three examples each of the renewable and non-renewable sources of energy are as follows:
Renewable - Sunlight, Water, Plant.
Non-renewable - Coal, Petrol, Diesel.
b. Name different forms of energy with two examples of their sources.
Answer: The different forms of energy with two examples are as follows:
i. Mechanical energy: Sewing machines, mixer.
ii. Chemical energy: Coal, petrol.
iii. Heat energy: Sun, firewood.
iv. Light energy: Electrical bulb, candles.
v. Sound energy: Radio, guitar.
vi. Electric energy: Fan, iron.
vii. Magnetic energy: Magnet, magnetic compass.
viii. Solar energy: Solar cells, Sun.
c. Why is the sun called an ultimate source of energy?
Answer: The sun is called an ultimate source of energy because almost all the forms of energy come directly and indirectly from the sun.
d. How do we get hydroelectric energy?
Answer: We get hydroelectric energy from running water.
e. Write two differences between renewable and non-renewable sources of energy.
Answer: The two differences between renewable and non-renewable sources of energy are as follows: *Here are 3 differences :)
| Renewable | Non-renewable |
| 1. It can be renewed naturally. | 1. It cannot be renewed. |
| 2. It can't be used up fully. | 2. It can be used completely. |
| 3. Examples-Sun, water, wind, plants, etc. | 3. Examples-Coal, petrol, natural gases, etc. |
f. Why should we give more importance to the solar energy?
Answer: We should give more importance to the solar energy because it is renewable sources of energy and cannot be used up fully.
g. Write any two difference between light and heat energy?
Answer: The two difference between light and heat energy are as follows:
| Light energy | Heat energy |
| 1. It makes things visible. | 1. It gives body warm. |
| 2. It helps in photosynthesis. | 2. It helps to cook food, boil water, etc. |
h. How does electrical energy differ from magnetic energy?
Answer: Electrical energy is produced due to the flow of electrons whereas magnetic energy is obtained from magnet.
i. How is sound energy produced?
Answer: Sound energy is produced due to the vibration of the objects.
j. Why does energy crisis occur?
Answer: Energy crisis occurs due to overused or misuse of non-renewable sources of energy.
k. We must conserve the energy. Why?
Answer: We must conserve the energy for our future uses. If we don't conserve the energy, there will be serious problems of energy crisis.
l. What is energy conservation?
Answer: The practice of saving energy from being wasted or overused is called the conservation of energy.
m. Write three ways of energy conservation?
Answer: The three ways of energy conservation are:-
i. By using the power electric bulbs.
ii. By using solar power as far as possible.
iii. By avoiding unnecessary cutting down of trees.
7. Name the forms of energy for the following sources.
| a. Magnetic compass | b. Electric bulb | c. Guitar |
| d. Hydroelectric station | e. Red hot iron | f. Solar cooker |
Answer:
| a. Magnetic compass | Magnetic energy |
| b. Electric bulb | Light energy |
| c. Guitar | Sound energy |
| d. Hydroelectric station | Electric energy |
| e. Red hot iron | Heat energy |
| f. Solar cooker | Solar energy |
GLOSSARY:
Visible: able to be seen. (#visible meaning in Nepali language is देख्न सकिने.)
Vibration: moving up and down from a fixed point. (#vibration meaning in Nepali language is कम्पन.)
Appliances: electrical instruments used at our home. (#appliances meaning in Nepali language is उपकरण, यन्त्र.)
Crisis: lack. (#crisis meaning in Nepali language is संकट.)
Ultimate: fundamental. (#ultimate meaning in Nepali language is आधारभूत.)
#From above grade class-5 science notes of "Energy" Unit-9, we hope students can explain the meaning of energy and sources of energy. They can define renewable and non-renewable sources of energy. Also they can describe and identify various forms of energy.
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