Unit-8 Science & Technology: The Alternative Energy Sources – Class 9 English Exercise

The Alternative Energy Source is the reading text under Science and technology: The Unit of class 9 English new course. In this article we have published the exercise of class 9 English.

The Alternative Energy Sources

A. Match the words with the meanings.

a. fleet- iii. a group of something

b. inflatable – iv. capable of being filled with air

c. harness- vii. to control and use the force or strength of something

d. vane -i. a flat plane that is moved by the wind

e. skyscraper- ii. a very tall building

f. fission- v. the act or process of splitting the nucleus of an atom

g. bountiful -vi. in large quantities

B. Find the antonyms of the following words from the text.

a. endless-finite

b. modern – traditional

c. covered- revealed

d. fragrant- odor

e. bound – separated

f. inadequate- bountiful

B. Match the idea numbers with the correct idea.

Idea I- iv. solar energy

Idea II- v. energy through body movement

Idea III- i. wave energy

Idea IV – ii. hydrogen energy

Idea V – vi. alters energy

Idea VI- iii. energy through the fusion process

C. Answer the following questions.

a. How did JAXA prove the viability of the idea of space-based solar energy?

⇒ JAXA proved the viability of the idea of space-based solar energy by converting 1.8 kilowatts of electricity into microwaves, after which they wirelessly beamed them a distance of 50 meters.

b. What do we need to generate energy through our body movement?

⇒ To generate energy through our body movement, we need to wear a system that collects and converts it.

c. In what way are Idea III and V similar?

⇒ Idea III and V are similar as both ideas suggest we can generate energy with winds.

d. How can hydrogen be used as a source of energy?

⇒ Hydrogen can be used as a source of energy by separating it from the other elements.

e. Why do floating turbines seem more effective than tower-mounted turbines?

⇒ Floating turbines seem more effective than tower-mounted turbines because these turbines produce double the energy of similar-sized tower-mounted turbines.

f. Why is the fusion process environmentally friendly?

⇒ The fusion process is environmentally friendly because this process emits no pollutants or greenhouse gases and has no threat of nuclear meltdown, unlike current nuclear fission reactors.

g. What does ITER stand for?

⇒ ITER stands for International Thermonuclear Experimental Reactor.

Grammar II

A. Fill in the gaps with suitable relative pronouns.

a. Is that the spot where you had the accident?

b. The photograph which you saw was taken a long time ago.

c. Are those the students who you were talking about?

d. Last week, I went to visit the town where my friend lives.

e. This is the house where my uncle and aunt live.

f. These are the girls who work hard.

g. Krishna was the boy whom everyone appreciated.

h. This is the judge who is known for her wise decisions.

i. This is the site where. I intend to build a house.

j. The tiger which terrified the villagers was sent to the zoo yesterday.

k. The tree which he cut down was not a large one.

l. Mt. Everest which is the highest peak in the world, lies in Solukhumbu district.

B. Rewrite the following pairs of sentences using who, whom, whose, which/that, or where.

a. Are these the keys? You were looking for the keys.

⇒  Are these the keys which you were looking for?

b. Unfortunately, we couldn’t attend the wedding. We were invited to the wedding.

⇒  Unfortunately, we couldn’t attend the wedding which we were invited to.

c. What is the name of the hotel? Your brother works in the hotel.

⇒  What is the name of the hotel where your brother works?

d. The party wasn’t enjoyable. We attended the party last Saturday.

⇒  party which we attended last Saturday wasn’t enjoyable.

e. What is the name of the boy? The boy’s father is a dentist.

⇒  What is the name of the boy whose father is a dentist?

f. Who was the man? You talked to the man in the restaurant.

⇒  Who was the man to whom you talked in the restaurant?

g. What is the name of the shop? They sell medicine in the shop.

⇒  What is the name of the shop where they sell medicine?

h. Is this the man? The man donated all his property to a hospital.

⇒  Is this the man who donated all his property to a hospital?


Write a news article about Green Energy.

Harnessing the Power of Green Energy for a Sustainable Future

Renewable Sources Take Center Stage in the Global Shift Towards Clean Energy Solutions

Date: 06/22/23

In recent years, the world has witnessed a remarkable surge in the adoption of green energy as nations and communities unite to combat the pressing challenges of climate change and environmental degradation. From innovative solar farms to towering wind turbines, the utilization of renewable energy sources has emerged as a pivotal solution in the quest for a sustainable future. Today, we delve into the remarkable progress and promising advancements in the realm of green energy.

Green energy, also known as renewable energy, refers to energy generated from sources that are naturally replenished and have a minimal impact on the environment. These sources include solar power, wind power, hydropower, geothermal energy, and bioenergy. Unlike traditional fossil fuels, green energy does not release harmful greenhouse gases into the atmosphere, making it a crucial component in mitigating climate change and achieving carbon neutrality.

One of the key players in the green energy revolution is solar power. The use of photovoltaic panels to harness the sun’s rays has seen a tremendous increase in recent years. Solar farms, consisting of vast arrays of panels, are being constructed across the globe, transforming previously unused land into clean energy powerhouses. Moreover, advancements in solar technology have made it more accessible to individuals and businesses, with rooftop solar installations becoming a common sight in many communities.

Another prominent contender in the green energy landscape is wind power. Gigantic wind turbines, towering over landscapes both onshore and offshore, are rapidly becoming symbols of a sustainable future. These turbines capture the power of the wind and convert it into electricity, providing a renewable and clean source of energy. Wind farms are being established in regions with strong and consistent wind patterns, ensuring optimal energy generation while minimizing the ecological footprint.

Hydropower, generated from the force of moving water, has long been recognized as a reliable source of green energy. Dams and hydroelectric power plants harness the energy of flowing rivers and convert it into electricity. This renewable energy source has the added advantage of being able to store energy, allowing for a consistent power supply even during periods of high demand.

Geothermal energy, derived from the heat within the Earth’s core, is yet another exciting avenue for green energy. By tapping into the natural heat reservoirs beneath the Earth’s surface, geothermal power plants produce electricity and heat without relying on fossil fuels. This clean and renewable energy source has immense potential, particularly in regions with abundant geothermal resources.

Bioenergy, derived from organic matter such as plants and agricultural waste, is also making strides in the transition to green energy. Biomass power plants and biofuel production facilities are utilizing organic materials to generate electricity, heat, and transportation fuels. By harnessing the energy stored in these bioresources, we reduce dependence on non-renewable fuels and contribute to a more sustainable energy ecosystem.

The shift towards green energy is not only driven by environmental concerns but also by economic opportunities. Investments in renewable energy technologies have surged in recent years, creating job opportunities and driving economic growth. The renewable energy sector offers vast potential for innovation, research, and development, positioning countries at the forefront of the clean energy transition.

As the world recognizes the urgent need to combat climate change and reduce carbon emissions, the adoption of green energy has become paramount. Governments, businesses, and individuals are embracing renewable energy solutions to not only reduce their environmental impact but also to secure a cleaner and brighter future for generations to come. The ongoing advancements in green energy technologies, coupled with growing public awareness, are paving the way for a sustainable global energy landscape.

In conclusion, green energy has emerged as a beacon of hope in the fight against climate change. The harnessing of renewable sources such as solar, wind, hydro, geothermal, and bioenergy is transforming the way we power our world. With each solar panel installed, each wind turbine erected, and each innovative green energy project undertaken, we move one step closer to a sustainable future. Together, let us embrace the power of green energy and strive towards a cleaner, greener, and more resilient planet.

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