Tag: English

  • Class-7 Chapter-3A Space Exploration


    B. Answer the following questions


    1. How did Major Yuri Gagarin feel when he spoke to the officials at the great launching site?
    Yuri Gagarin felt proud and honoured to be chosen for such an important mission. He spoke calmly and politely to the officials and said goodbye as if he were going on a long journey.


    2. List the things that suggest the great size of the rocket that launched Vostok-I.
    The rocket was huge and tall, as it had a sharp nose pointing skywards and required a lift to carry Gagarin to the top. It also produced a sheet of flame and clouds of smoke when it lifted off.


    3. Had Major Yuri Gagarin ever before entered Vostok-I? How did he know the precise movements he had to make?
    No, he had never entered the real Vostok-I before. However, he had trained many times in an exact replica (copy) of the capsule. During training, he had practised all the movements he would need to make.


    4. How did Major Yuri Gagarin feel when the hatch was closed above him?
    He felt alone and isolated inside the cabin, but he remained calm. He began to carry out the preliminary checks with a focused mind.


    5. Where did Major Yuri Gagarin work before joining the Soviet Air Force? What was his occupation?
    Before joining the Soviet Air Force, Gagarin worked in a factory as an apprentice moulder (a person who shapes metal).


    6. What sort of training did Gagarin have to get before he was accepted in the Soviet Air Force?
    He had to work very hard to become a pilot. He took flying lessons, qualified as a pilot, and earned his wings through dedication and hard work.


    7. Why did Gagarin volunteer for training as a cosmonaut?
    Gagarin had a strong fascination with flying and space. His interest in aeroplanes led him to volunteer for cosmonaut training.


    8. Why didn’t Gagarin feel any tension when he entered the spacecraft?
    He did not feel tension because he had spent the last year learning how to stay calm under pressure. He had trained his mind to ignore impatience and anxiety.


    9. What could Gagarin feel/hear inside when the rocket lifted off the launching pad? Did he have any idea of this before?
    Inside the rocket, he could hear a loud noise like thunder and feel strong vibrations. He could not move due to irresistible forces. Yes, he had an idea from training on the centrifuge, which had prepared him for such forces.


    10. What parts of the rocket/launch vehicle were separated from Vostok-I before it entered its orbit?
    First, the nosecone was withdrawn, then the last stage of the rocket fell away, allowing Vostok-I to enter orbit.


    11. How did Yuri Gagarin feel when Vostok-I entered the orbit? What was the cause of this feeling? Did Gagarin feel upset with this? Give reasons for your answer.
    When the spacecraft entered orbit, Gagarin felt a strange and new feeling called weightlessness, because gravity was no longer acting on him.
    No, he did not feel upset. He calmly accepted it and soon got used to it.


    12. List the things that Gagarin noticed inside the cabin when Vostok-I entered its orbit.
    Inside the cabin, he noticed:

    • Objects were floating in the air
    • His notebook drifted away
    • His pencil floated out of reach
    • He had to hold things down
    • He could still eat and do his tasks in weightlessness

    13. Did Gagarin feel helpless or did he try to study and analyse the situation in which he found himself?
    Gagarin did not feel helpless. He tried to study the situation carefully. He remained calm, observed everything, and even wrote down his impressions.


    14. List the precautions and steps that were taken for the re-entry of the spacecraft into the earth’s atmosphere.
    For re-entry:

    • Retro-rockets were fired to slow down the speed
    • This caused the capsule to sink into the atmosphere
    • The re-entry was planned carefully, as it was the most dangerous phase of the mission

    15. How did the two peasant women react when they saw the spacecraft coming down? What did Gagarin have to tell them to make them feel normal?
    The women were afraid when they saw the strange object and Gagarin in his bright orange suit and helmet.
    To calm them, Gagarin took off his helmet and said,
    “I am one of your own people, comrade! I am Yuri Gagarin!”


    A. Complete the following table: The First Man in Space

    Detail Information
    Name of the astronaut/cosmonaut Yuri Gagarin
    Age 27 years
    Nationality Soviet (Russian)
    Name of the spacecraft Vostok-I
    Weight of the spacecraft 4.5 tons
    Date of the flight April 12, 1961
    Time of take-off 9:11 a.m.
    Time of landing 10:59 a.m.
    Duration of the flight 108 minutes
    Launching site Baikonour, Central Asia
    The speed at which it hurtled around the earth 17,000 miles per hour
  • Class-7 Chapter-2B Effects Of Air Pollution


    ✅ B. Answer the following questions


    1. What kinds of diseases are caused by air pollution? Name some of them.
    Air pollution causes many serious diseases, especially related to the lungs, heart, and respiratory system.
    Some of them are:

    • Asthma
    • Bronchitis
    • Lung and heart diseases
    • Respiratory allergies
    • Premature death

    2. How does the excess amount of some gases affect the earth’s atmosphere?
    Excessive amounts of gases like carbon dioxide, methane, and nitrous oxide trap heat in the atmosphere.
    This leads to the greenhouse effect, which causes:

    • Warming of the Earth’s atmosphere
    • Melting of polar ice caps
    • Rising sea levels and floods
    • Disruption of climate and weather patterns

    3. What changes will the greenhouse effect bring about on the earth?
    The greenhouse effect can cause:

    • Global warming
    • Melting of polar ice caps
    • Rising sea levels
    • Flooding of coastal areas
    • Large-scale changes in climate and weather
      These changes could have disastrous consequences for life on earth.

    4. In what way is the release of CFCs harmful for us?
    CFCs (Chlorofluorocarbons) are used in refrigerants and cleaning agents.
    When released, they damage the ozone layer, which protects the Earth from harmful ultraviolet (UV) rays.
    The thinning of the ozone layer can lead to:

    • Skin cancer
    • Eye problems
    • Harm to plants, animals, and marine life

    5. What is acid rain? List the things affected by acid rain.
    Acid rain is rain, snow, or fog that becomes acidic due to pollutants like sulphur dioxide and nitrogen oxides released by burning fossil fuels.
    Acid rain affects:

    • Lakes and rivers (kills fish and aquatic life)
    • Forests and soil (destroys trees and washes away nutrients)
    • Human health
    • Buildings and monuments (damages marble and stone structures)

    6. Why are the effects of acid rain widespread?
    The effects of acid rain are widespread because pollutants can travel hundreds or thousands of kilometers in the air before falling back to earth.
    This means that even places far away from the pollution source can be affected by acid rain.


    7. Pick out the line from the text that shows that the harmful effects of air pollution on buildings are not very old.

    “Experts say that more damage has been done in the past 30 years than in the previous 2,000 years.“


    A. Complete the following table

    Things Affected How Affected
    Human beings Suffer from diseases like asthma, bronchitis, lung and heart problems
    Plants, trees Damaged or killed by toxic gases; forests destroyed; crops affected
    Animals (like cattle) Poisoned by fumes from industries like aluminium smelters
    Water bodies (lakes, rivers) Acidified by acid rain; fish and aquatic life die
    Soil Nutrients like potassium, calcium, and magnesium are washed away by acid rain
    Buildings and monuments Become black with soot; marble eroded by acid rain (e.g., Taj Mahal, Krakow)
    Ozone layer Damaged by CFCs, allowing harmful sun rays to reach Earth

    Words

    Work in pairs. Find words/phrases from the text which are similar in meaning to the following:

    Given Word/Phrase Word/Phrase from the Text
    STOP POLLUTION control air pollution
    vehicular traffic urban transport
    fumes smoke / poisonous gases
    widespread all around us / extensive / ever-present
    ill-effects harmful effects
    disappeared seemed to disappear
    destroying slowly eroding / washing away
    saves protects
    in danger of dying forever threatened / endangered

    Grammar

    Use of the simple present tense, active and passive

    Complete the following

    Grammar: Use of the Simple Present Tense (Active and Passive)

    1. There are three thermal power plants in Delhi—Badarpur, Indraprastha and Rajghat. All of them release large volumes of pollutants into the air. A great deal of fly ash is also released from these plants. This ash pollutes not only air but also land and water.

    2. Each day Delhi is becoming dirtier and dirtier. Delhi produces about 6,000 tonnes of solid waste. This waste comes from households, industries and hospitals. But only 80% of this garbage is collected every day. The rest is left on the roads, streets, open spaces and parks to pile up. And this piling up goes on daily. If nothing is done to stop this, Delhi will become a huge garbage dump.
  • Class-7 Chapter-1 (A) Project Tiger 🐅


    1. When and why was the Project Tiger launched?
    Project Tiger was launched in 1973 by the Government of India with the aim of protecting the endangered tiger species and conserving their natural habitat.


    2. What was the main reason for the sharp reduction in the tiger population in the early part of the 20th century?
    The main reason for the sharp reduction in the tiger population during the early 20th century was uncontrolled hunting and poaching for sport and trade.


    3. To what extent did the Project Tiger help in increasing the tiger population?
    Project Tiger was successful to a great extent in the beginning. It led to a significant increase in the tiger population during the first few years after its launch.


    4. List all that helped to increase the tiger population between 1973 and 1989.
    Several factors helped increase the tiger population between 1973 and 1989:

    1. Establishment of protected tiger reserves
    2. Strict enforcement of wildlife protection laws
    3. Improved forest management
    4. Public awareness campaigns
    5. Support from wildlife conservationists and forest officials

    5. Why was the success achieved in Project Tiger during 1973 and 1989 not maintained?
    The success was not maintained due to rising poaching activities, illegal trade of tiger parts, and habitat destruction caused by development projects.


    6. What part of the tiger’s body was in demand earlier, and what part is in demand now?
    Earlier, the tiger’s skin was in high demand. At present, the bones and other body parts are in demand, mainly for use in traditional medicines.


    7. Who are the people out to destroy the tiger?
    People involved in poaching, smuggling, and illegal trade of wildlife products are responsible for destroying tigers. Additionally, those who destroy forests for development also contribute to the threat.


    8. In what way are development projects posing a threat to the tiger?
    Development projects such as the construction of roads, dams, and industries lead to deforestation and loss of tiger habitats, making it difficult for tigers to survive and reproduce.


    9. Describe two qualities mentioned in the last paragraph that can help the tiger to live.
    Two qualities that can help the tiger survive are:

    1. Strength and courage, which help it defend itself and hunt effectively.
    2. Majestic and admired nature, which can inspire people to protect and conserve the species.

    10. Discuss in class why the writer calls the tiger the world’s most charismatic animal. Do you agree?
    The writer calls the tiger the world’s most charismatic animal because of its grace, power, and majestic appearance, which make it stand out among all wild animals.
    Yes, I agree because the tiger is not only beautiful but also symbolizes strength and pride. It plays an important role in maintaining the balance of the ecosystem.