Energy In Daily Life | Chapter 7 | Grade-7 | Science and Technology Notes - New Course 2079-2081
7.1 Types Of Sources Of Energy:
Test Your Concept!
1. Fill in the blanks.
a. The energy obtained from preserved dead organisms is called fossils.
b. The energy obtained by burning dead organisms is called fossil fuels.
Also Check:
Energy In Daily Life | Chapter 7 | Grade-7 | Science and Technology Notes
c. All the renewable sources of energy can be considered as alternative sources of energy.
d. The solution to energy crisis is called energy saving.
e. The process of separating petrol, diesel and kerosene from crude oil is called fractional distillation.
Also Check:
Information and Communication | Chapter 2 | Grade-7 | Science and Technology Notes - New Course 2079-2081
Scientific Studies | Chapter 1 | Grade-7 | Science and Technology Notes - New Course 2079-2081
2. Multiple choice questions (MCQs):
a. Which of the following is caused by urbanization, overpopulation and industrialization:
A) energy saving
B) global warming
C) energy crisis
D) both B and C
Answer: D) both B and C
b. Which of the following source of energy is fuel?
A) hydroelectricity
B) solar heat
C) wind
D) tides
Answer: B) solar heat
c. Which source of energy is renewable?
A) water
B) coal
C) petrol
D) crude oil
Answer: A) water
d. Which source of energy is non-renewable?
A) firewood
B) petrol
C) gobar gas
D) sun
Answer: B) petrol
e. Which source of energy is alternative source of energy?
A) coal
B) nuclear fuel
C) petroleum
D) natural gas
Answer: D) natural gas
f. Which source of energy is fossil fuel?
A) firewood
B) Guitha (dung cake)
C) charcoal
D) coal
Answer: D) coal
g. Which source of energy is the best alternative source of energy in Nepal?
A) hydroelectricity
B) solar fuel
C) bio-fuel
D) wind
Answer: A) hydroelectricity
3. Short answer type questions:
a. Name any two examples of alternative source of energy.
Answer: The two examples of alternative source of energy are hydroelectricity and solar energy.
b. Define renewable source of energy.
Answer: Renewable sources of energy are the sources of energy which can be replaced immediately if they are finished at their place of origin.
c. Which source of energy is formed from the preserved dead bodies of organisms?
Answer: Fossil fuels are the sources of energy that is formed from the preserved dead bodies of organisms.
Or,
Fossil fuels are formed from the preserved dead bodies of organisms.
d. Write the full form of LPG.
Answer: The full form of LPG is Liquefied Petroleum Gas.
Or,
Liquefied Petroleum Gas is the full form of LPG.
[alert type=alert_info]#State any three reasons to justify that LPG is considered as an ideal fuel?
Answer: LPG is considered as an ideal fuel because it is easy to store, handle and transport. It produces large amount of heat on burning. It does not leave any residue on burning.[/alert]
e. What type of sources of energy are considered as alternative sources of energy?
Answer: Renewable sources of energy are considered as alternative sources of energy.
[alert type=alert_info]#What are the examples of alternative sources of energy?
Answer: The examples of alternative sources of energy are wood, hydropower, wind energy, geothermal energy, bio fuel, hydrogen energy, nuclear energy, tidal energy, etc.[/alert]
f. What is energy crisis?
Answer: The fast depletion of the non-renewable concentrated sources of energy is called energy crisis.
Or,
Any significant shortage in energy supply to a country or region is known as energy crisis.
Or,
The future scarcity of the energy sources on the earth due to the over population, urbanization and industrialization is called energy crisis.
Or,
The acute scarcity of energy sources due to overuse by growing population is called energy crisis.
g. What is energy saving?
Answer: The solution to energy crisis is energy saving.
Or,
The decision and practice of using less energy is known as energy saving.
Or,
The effort to reduce wasteful energy consumption by using fewer energy services is called energy saving.h. Define bio-fuel.
Answer: Bio-fuel is the liquid or gaseous fuels that are produced from biomass.
[alert type=alert_info]#biomass:- renewable organic material that comes from plants and animals.[/alert]
Or,
Biofuel is a type of renewable energy source derived from microbial, plant, or animal materials.
[alert type=alert_info]#What is bio gas?
Answer: Biogas is a renewable energy source produced by the breakdown of organic matter by certain bacteria under anaerobic conditions.
#What are the uses of bio gas?
Answer: The uses of bio gas are -
i) Commonly used in rural areas as cooking gas.
ii) Can be used for the production of electricity.
iii) Can be used in instruments used for water heating, space (room) heating etc.
iv) Can replace compressed natural gas for use in vehicles.
v) Can displace carbon dioxide in on-site CHP plants.[/alert]
i) Define fossil fuel.
Answer: Fossils preserved inside the earth also from fuels which are called fossil fuels.
Or,
Fossil fuels are formed from the decomposition of buried carbon-based organisms that died millions of years ago.
Or,
Fossil fuel is a generic term for non-renewable energy sources such as coal, coal products, natural gas, derived gas, crude oil, petroleum products and non-renewable wastes.
j) What is fuel?
Answer: Fuel is any substance that can provide heat and produce energy when it is burned.
Or,
A fuel is a material used to generate energy when it is burned.
Or,
Any substance that upon combustion produces a usable amount of energy is known as fuel.
k) Name any two fossil fuels.
Answer: The two examples of fossil fuels are coal and petroleum.
l) What can we do with energy?
Answer: Energy is the ability to do work, so different types of work can be done by different forms of energy in our daily life. It is used for heating, lighting and operating electric appliances.
4. Long answer type questions:
a. How is fossil fuel formed? What are the disadvantages of fossil fuel?
Answer: Fossil fuels are formed when organic matter that has been buried deep within the earth are subject to heat and pressure over millions of years.
The disadvantages of fossil fuel are -
i) Fossil fuels are non renewable.
ii) Water pollutions and Oil spills.
iii) Air pollution and Smog.
iv) Global warming.
v) Dangerous to produce.
b. How does the use of alternative source of energy help to push energy crisis further?
Answer: The use of alternative source of energy help to push energy crisis further because alternative sources of energy are renewable sources of energy which can be used again and again. By using alternative source of energy help to push energy crisis further can be justified by followings -
i) They can be used again and again.
ii) They cause less pollution.
iii) They are eco friendly.
iv) They decrease the risk of global warming.
v) Use alternative source of energy to prevent excessive use of Fossil fuels.
c. What are the disadvantages of fossil fuel?
Answer: The disadvantages of fossil fuel are -
i) Fossil fuels are non renewable.
ii) Fossil fuel like 'Oil spills' pollutes water and almost kills everything it contacts.
iii) The excessive use of fossil fuel, smog, pollutes Air pollution and causes troubles like lung cancer and asthma.
iv) Burning of fossil fuels generates huge amount of carbon dioxide which causes Global warming.
v) Fossil fuel, mining, is dangerous to produce as there’s still a human role that can come at a huge cost.
d. Describe the advantages of fossil fuel.
Answer: Fossil fuels are widely used by human beings although they cause air pollution when they are burnt. Fossil fuels are cheap sources of energy which have multipurpose usage. They can be transported easily everywhere. There are very large deposits of fossil fuels inside the earth, from which we can get massive economic benefits. Also, they create jobs and are reliable.
[alert type=alert_info]#What are the 10 advantages of fossil fuel?
Answer: The 10 advantages of fossil fuels are -
i) Cheap source of energy.
ii) Safe to transport.
iii) Massive economic benefits.
iv) Multipurpose uses.
v) Completely stable.
vi) Useful by product.
vii) Creates job.
viii) Abundant.
ix) Highly available.
x) Reliable.[/alert]
e. List any four ways of saving energy.
Answer: Here is the list of four ways of saving energy -
i) Unnecessary use of sources of energy should be avoided.
ii) Non-renewable sources of energy should be used less.
iii) Renewable sources of energy should be used more.
iv) New alternative sources of energy should be discovered.
v) Promote the use of electric vehicles by making short term and long term policy.
vi) Awareness about using different types of sources of energy should be increased in the people.
vii) Emphasis should be given to set up gobar gas plants, solar plants and wind energy plants in rural areas if feasiable.
(Pick any four points.😊)
f. Describe energy crisis in short.
Answer: The fast depletion of the non-renewable concentrated sources of energy is known as the energy crisis. An energy crisis is a major cut back in the energy supply within an economy. The energy crisis begins when the use of fossil fuels exceeds to an extent that it becomes impossible to produce newer versions of it and the use creates an enormous amount of pollution. Also, burning of these fuels result in the major cause of global warming.
g. How can you motivate your parents for the use of alternative sources of energy?
Answer: I will suggest them for using CNG vehicles and solar panels for generation of electricity. Also, we can use solar water heaters and gobar gas plants on daily basis.
Or,
We can motivate our parents for the use of alternative sources of energy by suggesting following ways -
i) To avoid unnecessary use of energy.
ii) To use less non-renewable source of energy.
iii) To use renewable sources of energy more.
iv) To use solar and electric vehicles rather than fuel vehicles.
v) To use electric appliances for household purposes.
h. "Energy saving can be known as energy production". Justify this statement.
Answer: Energy on this planet is limited. Then if we reduce our energy needs and try to save energy, that energy can be used by other people for fulfilling their requirements. In this way, we are producing energy for other people.
i. Bio-gas is an excellent fuel. Justify the statement by giving two sources.
Answer: Biogas is an excellent fuel because it is a renewable source of energy. It's a clean and secure source of energy which reduces soil and water pollution and also prevents health problems. The two sources of bio gas are (i) dung and urine of cattle and (ii) landfill gas.
j. Ram asked her father to set up a solar water heater on the roof top. His father asked about the need of such set up. Ram convinced his father and succeeded in setting up a solar water heater on his roof top.
i. State one advantage of installing up a solar water heater.
ii. What qualities of Ram are reflected in his action?
iii. State one limitation in using solar water heater.
Answer:
(i) State one advantage of installing up a solar water heater.
Answer: One advantage of installing up solar water heater is -
(i) No dependency on fuels, (ii) Have zero-emission, (iii) Lower carbon footprints. (Choose any one!😊)
(ii) What qualities of Ram are reflected in his action?
Answer: Ram is a energy saver. He is trying to save sources of energy by using a solar water heater.
(iii) State one limitation in using solar water heater.
Answer: One limitation in using solar water heater is -
(i) Its costly, (ii) It rely heavily on sunlight, (iii) Additional roof-top space is required to install the solar water heater. (Choose any one!😊)
5. Differentiate between:
a. renewable and non-renewable source of energy
Answer: The difference between renewable and non-renewable sources of energy are -
| S.N. | RENEWABLE SOURCES OF ENERGY | S.N. | NON-RENEWABLE SOURCES OF ENERGY |
|---|---|---|---|
| 1. | Renewable sources of energy are those sources of energy which can be renewed naturally over time. | 1. | Non-Renewable sources of energy are those sources of energy which are available in limited quantity. |
| 2. | They are replaced by nature in a short period of time. | 2. | They cannot be replaced by nature. |
| 3. | They are inexhaustible. | 3. | They will exhaust one day. |
| 4. | They do not cause any pollution. | 4. | They cause pollution when used. |
| 5. | Examples of renewable sources of energy are solar energy, wind energy, bio fuel, geothermal energy, etc. | 5. | Examples of non-renewable sources of energy are fossil fuels, nuclear energy, mineral ores, etc. |
[alert type=alert_info]#Write 4 examples of renewable sources of energy?
Answer: The 4 examples of renewable sources of energy are -
i) Wind
ii) Solar
iii) Hydropower
iv) Tidal power
v) Geothermal
vi) Biomass
vii) Hydrogen
(Choose any 4 examples 😊)
#Write 4 examples of non-renewable sources of energy?
Answer: The 4 examples of non-renewable sources of energy are -
i) coal
ii) oil
iii) natural gas
iv) nuclear energy.
v) iron
vi) copper.
(Choose any 4 examples 😊)[/alert]
b. energy crisis and energy saving
Answer: The difference between energy crisis and energy savings are -
| S.N. | ENERGY CRISIS | S.N. | ENERGY SAVINGS |
|---|---|---|---|
| 1. | The acute scarcity of energy sources due to overuse by growing population is called energy crisis. | 1. | The solution to energy crisis is energy saving. |
| 2. | Energy crisis makes the lives of animals harsh. | 2. | Energy savings make the lives of animals better. |
| 3. | Population growth and over exploitation of the non-renewable resources of energy are the causes of energy crisis. | 3. | Costly machines and less advanced technology are the drawbacks of energy saving. |
| 4. | Energy crisis produces the maximum greenhouse gases that lead to global warming. | 4. | Energy saving reduces the emissions of greenhouse gases that lowers the cost of household and national economy. |
c. bio-fuel and fossil fuel
Answer: The differences between bio fuel and fossil fuel are -
| S.N. | BIO FUEL | S.N. | FOSSIL FUEL |
|---|---|---|---|
| 1. | Bio fuel is a fuel produced from living matter. | 1. | Fossil fuel is a naturally occuring fuel produced through the geologicalprocess. |
| 2. | Bio-fuel is obtained from renewable sources of energy. | 2. | Fossil fuel is obtained from non-renewable sources of energy. |
| 3. | Bio-fuel provides low amount of energy. | 3. | Fossil fuel provides high amount of energy. |
| 4. | Bio-fuel causes less pollution than fossil fuels. | 4. | Fossil fuel plays a major role in envirnmental pollution. |
| 5. | Bio-fuel examples: biodiesel, bioethanol, etc. | 5. | Fossil fuel: coal, petrolium, natural gas, etc. |
6. Give reasons:
a. Coal is a non renewable source of energy.
Answer: Coal is a fossil fuel. Once it is burnt, it turns to ashes and can never be used again. So, coal is a non renewable source of energy.
Or,
Coal is a fossil fuel. It comes from the remains of plants that died about 100 to 400 million years ago. Coal is a non-renewable energy source because it takes millions of years to form.
Or,
Coal is classified as a nonrenewable source of energy as it takes millions of years to form and it is formed from the remains of plants that died millions of years ago.
b. Gobar gas is considered to be a boon to farmers.
Answer: Gobar gas is considered to be a boon to the farmers because -
i) Farmers can produce clean domestic fuel from the wastes like animal dung, dry leaves, dry plants, etc.ii) Spent slurry can be used in the fields as manure to increase the fertility of the soil.
iii) Gobar gas can be used to generate electricity which can be utilized to run modern machines used in the fields to save time and energy.
[alert type=alert_info]Gobar gas is considered to be a boon to the farmers. Give reasons.
Or,
List any three reasons due to which bio-gas is considered to be an excellent fuel.
Answer: The three reasons due to which bio-gas is considered to be excellent fuel are -
i) Gobar gas is pollution free.ii) It is cheap as raw material {i.e., cow dung and waste of plants and vegetables) to produce gobar gas is available free of cost to the farmers.
iii) The remains or used slurry in a gobar gas plant is used as manure by the famers in the field to get good yields of crops.[/alert]
c. Fossil fuels are used extensively although they are not eco-friendly.
Answer: Fossil fuels are used extensively although they are not eco-friendly because of the followings -
i) Fossil fuels are ready made.
ii) Fossil fuels are cheap sources of energy.
iii) Fossil fuels can be transported easily.
iv) Fossil fuels have multipurpose usage.
v) Fossil fuels are excellent as fuels.
d. By replacing fossil fuel with alternative sources, energy crisis can be pushed further.
Answer: As we know that the fossil fuels are limited on this planet, Earth. Once used, they will take millions of years to form. So, using fossil fuels less and excessive use of alternative sources/renewable sources of energy like, hydroelectricity, wind energy, bio-fuel, solar energy, etc., energy crisis can be pushed further.
e. Energy crisis is a burning issue in the world today.
Answer: The fast depletion of the non-renewable sources of energy is known as the energy crisis. Energy crisis is a burning issue in the world today, can be justified by following points:-
i) Excessive use of fossil fuels is leading to global warming.
ii) Overused of fossil fuels, energy crisis, is causing air pollution, water pollution, even health problems throughout the world.
iii) Less alternative source of energy is being carried out but aren't sufficient.
iv) Energy crisis is challenging the existence of human being and living things in this planet.
f. Energy saving is a solution to energy crisis.
Answer: Energy crisis will hit the planet one day as fossil fuel takes millions of years to produce again. So, energy saving is a solution to energy crisis because of following ways -
i) Avoiding unnecessary use of sources of energy.
ii) Using non renewable sources of energy less.
iii) Using more renewable source of energy, like bio-fuel, hydroelectricity, solar energy, wind energy, etc.
iv) New alternative sources of energy should be discovered.
v) Promoting the use of electric vehicles.
g. The best alternative energy for Nepal is hydroelectricity.
Answer: The best alternative energy for Nepal is hydroelectricity because Nepal does not have fossil fuels, so it has to import energy from other countries. Nepal has huge hydropower potential which it can harness to supply its own energy needs as well as sell to neighboring countries.
7. Diagrammatic question:
a. Answer the following questions on the basis of the given diagrams.
i) Name the sources of energy shown in diagram (A), (C) and (E).
Answer:
(A) = Bio-Fuel Energy.
(C) = Geothermal Energy.
(E) = Wind Energy.
ii) Which sources of energy can be used as an alternative energy source?
Answer: Bio-fuel energy, Solar energy, Geothermal energy, Hydroelectric energy and Wind energy can be used as an alternative energy source.
iii) Use of which energy source should be reduced for energy saving?
Answer: All of the above sources of energy are renewable and are good for energy saving. I choose solar energy to be reduced for energy saving among them because the devices required to set up are quite expensive and also it depends upon the sun light that may cause the less energy production.
iv) Why is (D) the best alternatives source of energy in Nepal?
Answer: (D) Hydroelectric energy, is the best alternatives source of energy in Nepal because
Nepal is second richest country in water resources and first in Asia. There are more than 6,000 rivers in Nepal. The total hydroelectricity generation capacity of the rivers of Nepal is 2 lakhs 2 thousands million cubic meter. 83 thousands mega watt's electricity can be generated from the rivers of Nepal but Nepal has just succeeded to generate 42 mega watts electricity due to the poor development of the country.
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[alert type=alert_outline]# What is an energy crisis? Write any 3 ways to solve it.
Answer: The acute scarcity of energy sources due to overuse or exploitation by the growing population is called an energy crisis. 3 ways to solve it are-
1. Adaption of alternative energy sources.
2. Banning the use of non-renewable sources and encouraging the use of renewable sources.
3. Using existing sources wisely and economically.
# In the context of Nepal, biogas energy is the best of source alternative energy.
Answer: Nepal is an agricultural country. Natural wastes, sewage, etc. can be used to generate biofuel. The most practiced profession animal husbandry is also the source of different materials like decayed grasses, dung, etc. which again can be used to get biofuel. On the other hand, a lot of dense forests are found in Nepal from where a high amount of biofuel can be taken. So, in the context of Nepal, biogas energy is the best source of alternative energy.
# Biofuel is a renewable energy source. Why?
Answer: Biofuel is an organic source of energy that can be obtained from biomass, wood, hay, straw, etc. It is more eco-friendly than other sources of energy. It also can be produced continuously and effectively even in rural areas. So, bio-fuel is called a renewable energy source.
# Why is fossil fuel being used more than other fuels in the world?
Answer: Fossil fuels are formed from the fossils of the plants and animals that are buried under the earth's crust for millions of years. It is cheaper as it is found in a huge amount. It is easier to transport. It is used for various purposes like to run automobiles, factories, and even to generate electricity. So, fossil fuel is used more than other fuels in the world.
# The sun is the ultimate source of energy. Give reason.
Answer: We all know the sun is the main source of energy. It is an extremely large mass of hot gasses. It provides energy for all living beings on the earth directly or indirectly. It is the store house of energy. It produces energy called solar energy. Hence, the sun is the ultimate source of energy.[/alert]
:::::
7.2 Heat:
Test Your Concept!
1. Tick (✓) the correct statements and cross (⨯) the incorrect ones.
a. Mercury is a thermometric liquid used in a clinical thermometer. (✓)
b. Temperature is the cause of the heat of a body. (⨯)
c. A thermometer is used to measure the temperature of a body. (✓)
d. At room temperature, mercury exists in the liquid state. (✓)
e. Celsius, Fahrenheit and Kelvin are the units of temperature. (⨯)
2. Multiple choice questions (MCQs):
a. Which one of the following is the degree of hotness or coldness?
A) temperature
B) heat
C) conduction
D) radiation
Answer: A) temperature
b. What is the range of temperature mentioned in a laboratory thermometer?
A) 10⁰C to 100⁰C
B) -10⁰C to 100⁰C
C) -10⁰C to 110⁰C
D) 0⁰C to 110⁰C
Answer: C) -10⁰C to 110⁰C
c. What is the normal body temperature of humans?
A) 96⁰F
B) 100⁰F
C) 98.6⁰F
D) 96.6⁰F
Answer: C) 98.6⁰F
d. What is the SI unit of temperature?
A) Celsius
B) Fahrenheit
C) Kelvin
D) Joule
Answer: C) Kelvin
3. Differentiate between:
a. heat and temperature
Answer: The differences between heat and temperature are -
| HEAT | TEMPERATURE |
|---|---|
| 1. Heat is a form of energy that gives the sensation of warmth. | 1. Temperature is a degree of hotness or coldness of a body. |
| 2. Heat measures the total kinetic energy of all the molecules of a substance. | 2. Temperature measures the average kinetic energy of the molecules of a body. |
| 3. Heat has a working capacity. | 3. Temperature doesn't have a working capacity. |
| 4. Heat can flow from a hot to a cold object. | 4. Temperature can rise when heated and decreases when an object is cooled down. |
| 5. Heat is measured in a calorimeter. | 5. Temperature is measured in a thermometer. |
| 6. The SI unit of heat is joule (J). | 6. The SI unit of temperature is Kelvin (K). |
#What are the differences between heat and temperature?
#List 5,6 differences between heat and temperature.
b. clinical and laboratory thermometer
Answer: The differences between clinical and laboratory thermometer are -
| Clinical Thermometer | Laboratory Thermometer |
|---|---|
| 1. It is used to measure the body temperature. | 1. It is used to measure the temperature of different objects in laboratory. |
| 2. It has temperature range from 35⁰C to 42⁰C. | 2. It has temperature range from -10⁰C to 110⁰C. |
| 3. It has a kink near the bulb. | 3. It has no bulb. |
| 4. It can be tilted while taking reading. | 4. It should be kept upright while taking the reading. |
| 5. It's use of mercury is more actively discouraged. | 5. It's use of mercury is less dangerous. |
#List 5,6 differences between clinical and laboratory thermometer.
4. Short answer type questions:
a. What is heat? Write its SI unit.
Answer: Heat is the total kinetic energy of the molecules that can flow from a hot body to a cold body.
Or,
Heat is a form of energy that gives the sensation of warmth.
Or,
Heat is a form of energy that can be converted into work.
Or,
Heat is a form of energy that exists as kinetic energy, or motion, in particles of matter.
b. Write the name of different temperature scales.
Answer: The name of different temperature scales are Centigrade Scale, Fahrenheit Scale and Kelvin Scale.
Or,
Centigrade Scale, Fahrenheit Scale and Kelvin Scale are the names of different temperature scales.
c. What is laboratory thermometer?
Answer: A laboratory thermometer is a tool that is used for measuring the temperature of liquids and other objects in the laboratory.
Or,
A laboratory thermometer is a tool used in laboratories to measure temperature with high accuracy.
d. On what principle, is the liquid thermometer based?
Answer: The liquid thermometer is based on the principle that "a liquid expands on heating and contracts on cooling".
e. Write any two precaution while using a laboratory thermometer.
Answer:
f. Name any two thermometric liquids.
Answer: The two thermometric liquids are -
i) Mercury
ii) Alcohol.
g. Write any two features of a laboratory thermometer that makes it more sensitive.
Answer: The two features of a laboratory thermometer that makes it more sensitive are -
i) narrow capillary tube
ii) thin bulb.
h. What is a Celsius scale?
Answer: Celsius scale is the centigrade scale of temperature where the lower fixed point is taken as 0⁰C and the upper fixed point is taken as 100⁰C.
i. What is the SI unit of temperature?
Answer: The SI unit of temperature is Kelvin (K).
5. Long answer type questions:
a. What is temperature? Justify that heat is the cause and temperature is the effect on a body.
Answer:
b. Discuss the various scales of temperature.
Answer:
c. Explain why mercury is used as a thermometric substance.
Answer:
d. Describe the relationship among Celsius, Fahrenheit and Kelvin scales of thermometer.
Answer:
e. How does a digital thermometer work?
Answer:
f. At what temperature are the readings on Celsius and Fahrenheit scales same?
Answer:
g. Draw a labelled diagram of a laboratory thermometer and explain its construction and working mechanism.
Answer:
h. Demonstrate that change in heat causes change in temperature.
Answer:
6. Give reasons:
a. People use digital thermometer instead of a clinical thermometer.
Answer:
b. We feel cold when we touch to tap water.
Answer:
c. Heat is a form of energy.
Answer:
d. There can be temperature without heat.
Answer:
e. The study of temperature and heat is important.
Answer:
f. The temperature of a body increases when heat increases.
Answer:
7. Numerical problems:
a. Our friend in Manang would like to know the temperature of Kathmandu which is 15°C. Convert the temperature into degree Fahrenheit. [Ans: 59F]
Answer:
Here,
Temperature of Kathmandu = 15°C
We know that,
b. The measured temperature of Janakpur currently measures 35°C. Convert the temperature into degree Fahrenheit. [95C]
Answer:
c. Convert 292 K into Fahrenheit scale. [Ans: 65.93F]
Answer:
d. Convert 14°F into Celsius and Kelvin. [Ans: -10C, 263.15 k]
Answer:
e. The temperature of Kathmandu varies from 5°C to 35°C. Express the temperature into Kelvin scale. [278.95, 308.13]
Answer:
f. The temperature of Pokhara is 25°C. If you have to send the temperature to Doma in Mustang in °F, how will you change the temperature? Calculate. [Ans: 77F]
Answer:
#To be continued ... 😊😍
For More Check Here:
Energy In Daily Life | Chapter 7 | Grade-7 | Science and Technology Notes
#From above grade/class-7 science notes of Chapter-7 "Energy In Daily Life" New Course 2079-2081, we hope students will be able to:
[7.1] Types of sources of energy.
7.1.1 Classify the sources of energy used in our daily life.
7.1.2 Introduce fossil fuel and tell thr advantages and disadvantages of its use.
7.7.3 Tell the importance of the conservation of sources of energy.
7.1.4 Mention and follow the measures of their conservation.
[7.2] Heat
7.2.1 Define temperature with its example.
7.2.2 Introduce thermometer and measure temperature using it.
7.2.3 Describe the structure and working method of a laboratory thermometer.
7.2.4 Identify the units (C, F and K) of temperature and interchange them.
7.2.5 Tell the melting point of ice and the boiling point of water at sea level; mention human body temperature; show with the help of an experiment that heat flows from higher temperature to lower temperature.
7.2.6 Demonstrate change in temperature by change in the heat of the bodies.
7.3 Sound
7.3.1 Introduce wave and mention the types of waves.
7.3.2 Demonstrate the behaviourable activities of wave transformation.
7.3.3 Define wave length, amplitude, frequency and speed of wave.
7.4 Light
7.4.1 Define reflection of light and identify its use and effect in our daily life.
7.4.2 State the laws of reflection of light and demonstrate them.
7.4.3 Show reflection of light by a plane mirror with the help of a ray diagram.
7.4.4 Construct a model periscope and show its working method using a ray diagram and investigate its use.
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