NCERT Solutions for Class 10 English Main Course Book Unit 3 Science Chapter 1 Promise for the Future : Renewable Energy

NCERT Solutions for Class 10 English Main Course Book Unit 3 Chapter 1 Promise for the Future: Renewable Energy is part of NCERT Solutions for Class 10 English. Here we have given NCERT Solutions for Class 10 English Main Course Book Unit 3 Chapter 1 Promise for the Future: Renewable Energy.

Board	CBSE
Textbook	NCERT
Class	Class 10
Subject	English Main Course Book
Chapter	Unit 3 Chapter 1
Chapter Name	Promise for the Future: Renewable Energy
Category	NCERT Solutions

CBSE Class 10 English Main Course Book Unit 3 Science Chapter 1 Promise for the Future: Renewable Energy

TEXTUAL EXERCISES

Question 1.
In A.2 you will read about alternate sources of energy. Before doing so find out how much you already know about renewable sources of energy. Complete column A, to indicate whether you think each statement is True (√), False (x), or whether you do not know (?) After reading the passage, complete column B in the same way.
Answer:
No questions asked

Question 2.
Now go back to A.I. and complete column (B). How much did you know already before you read the article?
Answer:

Statements	(A)	(B)
(a) Solar energy is a powerful source of energy	True	True
(b) Electric battery-operated cars are more powerful than those run on fossil fuels	False	True
(c) EV stands for electric vehicles	True	True
(d) Driving an electric vehicle is stressful	False	False
(e) Solar power can be the next source of pollution in the world	False	False
(f) India is one of the countries with a great potential for generation and use of solar energy	True	True
(g) Using alternate sources of energy can help India save a lot of money spent in foreign exchange	True	True

Question 3.
Complete the following blanks with information from the passage :

(a) India receives 5000 trillion kWh/year which means ________ .
(b) The advantages of using solar energy instead of fossil fuels is that it is ________ .
(c) It is important to find means of keeping air and noise pollution in urban areas under control because ________ .
(d) Tax exemptions and subsidies are required to ________ .
(e) The media can help by ________ .

Answer:

(a) that the country can get 5000 trillion kW of solar energy in a year. It is far more than its annual energy consumption.
(b) renewable, clean and easily available
(c) of ever increasing pollution levels which is harmful for human race
(d) promote the usage of electric vehicles
(e) playing its role in educating the public about alternate fuel vehicles and their advantages.

Question 4.
Copy and complete the following table with the required information from the passage
Answer:

Points of Comparison	Internal Combustion Engine	Electric Motors
1. Pollution	emits more	emits less, clean and smog-free air
2. Engine efficiency	less energy efficient	more energy efficient driving easier
3. Peak power generation	cannot generate at low speed	can generate even at low speed
4. Recharging	not possible, fresh fuel every time	rechargeable, possible at home also
5. Maintenance	high maintenance cost	low maintenance cost

Question 5.
Based on your reading of the passage say whether the following statements are True or False :

(a) EV’s have the potential to flourish in India
(b) EVs degrade with time
(c) EVs can create health hazards
(d) EVs cannot drive fast because they have only two pedals
(e) Solar power will not last for a very long time in our country
(f) Establishing Solar Power generating units is too expensive

Answer:

(a) True
(b) False
(c) False
(d) False
(e) False
(f) True (cost of equipments is costly)

Question 6.
You are going to listen to a presenter discussing three new inventions-The Solerickshaw, the Green Phone and the Solar Water Purifier. As you listen complete the notes given below :

Answer:

I. Solerickshaws

1. Features
(i) pedal-operated
(ii) motor-assisted three-wheeler
(iii) battery powered by solar energy
(iv) zero-carbon urban transport vehicle

2. a team of Engineers from the Central Mechanical Engineering Research Institute (CMERI), Durgapur, West Bengal.

II. Green Phones

1. Blue Earth developed by → Samsung
(i) back with → a full solar panel
(ii) made from → recycled plastic
(iii) CO₂ emissions monitored by → built in pedometer
(iv) fits into → your pocket

2. Coral 200

(i) powered by → Solar energy
(ii) fits → into your pocket and your budget
(iii) made by → ZTE the Chinese mobile manufacturer
(iv) talk time fifteen minutes for every one hour of sunlight

3. LG

(i) three mins, of talk time for ten minutes of sunlight
(ii) Bluetooth solar car kit called → HFB-500
(iii) features
(i) hands-free
(ii) fully rechargeable unit

III. Solar water purifier

1. First type features

(i) twelve volt water purifier
(ii) more potable

2. Second type features

(i) distillation without electricity
(ii) relatively inexpensive
(iii) process of distillation

(a) water heated by → sun rays
(b) water condensation on → the underside of solar panel
(c) impurities collected in → a box
(d) water collected in → a trough
(e) from trough into → the collection bottles
(f) germs and bacteria killed by → UV rays from the sun.

Question 7.
You have listened to a presentation on three new inventions. One of them is solar water purifier. The stages of water purifier can be set in a flow-chart. Copy and complete the following flow chart with the stages in their correct order.
Answer:

Stages in correct order :

solar panel is placed on top of a rectangular shaped box
box filled with unpurified water
sun rays heat the water
water condenses on the underside of the solar power
impurities of water remain in the box
slope of the panel allows water to be collected in the trough
bottles collect water from trough

Question 8.
Now read that portion of the listening text describing the solar distillation system :
Answer:
No question asked.

Question 9.
Below is a flow chart describing the process of making rubber. Use it to help you copy and complete the process description that follows it. Remember to use the simple present tense, a mixture of actives and passives, and to add sequence markers where you see
Answer:
First rubber trees are planted in deep soil. When the trees are cut, fully the containers are attached to, the bark of the tree ….. and containers are filled with latex. The latex is collected and is sent to the factory. Here it is coagulated by treating it with acetic acid. The coagulated mass is then separated. It is then pressed into blocks or rolled into sheets. After that blocks or sheets are dried in a current of warm air.

We use Simple Present Tense along with sequence markers. Yes, we have used mixture of actives and passives.

The tense used was Present Tense
Sequence markers were used
Both Active and Passive Voices were used

Question 10.
You have been gifted a new cell phone which is powered by solar energy. Write an email to your friend describing the phone and all its exciting features. You may use the notes that you have made in A.7.
Answer:

Date : May 11, 20 – –
From : renumalik@gmail.com
To : mehakgupta@yahoo.com
Subject : New Cell phone : Solar 777

Dear Mehak

I hope my letter will find you all, in the best of health and spirits. I was mightily thrilled to receive two books ‘The Tinkler’s Question’ and ‘The Immortals of Meluha’ that you sent lately.

I apprise you of the most wonderful gift that has made a difference to me. I am sure it will also change the mindsets of the entire country, once it becomes popular. The new cell phone ‘SOLAR’ 777 is powered by solar energy. Realising the side- effects of mobile-phones, many manufacturers are going green while others are going solar. Three cheers for Samsung that has introduced the solar-powered phone. It is a touch phone that has full solar panel on its back. This panel can generate enough power to charge the phone. It has a built-in pedometer to keep a tab on the carbon dioxide emissions. And …more important, it fits into your pocket and your budget constraints. It provides fifteen minutes of talktime for every hour of sunlight. Isn’t it a wonderful invention ?

I shall gift you Coral 200, a solar-powered handset from Chinese mobile manufacturer ZTE on your birthday.

Bye ! Stay in touch.
Your friend
Renu

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