Unseen Passage for Class 6 with Questions

Reading comprehension lesson 21: Science and environment passages · Set 77 · 12 questions

Reading tip (Cause and effect): Find the topic of the passage in the first sentence. Look for cause-and-effect words: because, so, as a result. Work out new science words from the sentence that explains them.

1. 1.The Moon is Earth’s only natural satellite. It goes around the Earth once in about a month. The Moon does not have its own light. It shines because it reflects light from the Sun. As it moves, we see different amounts of its lit side. These changing shapes are called phases. On a full moon night, we see the whole bright face. On a new moon night, we can hardly see it at all.
   
   True or false: On a new moon night, we see the whole bright face of the Moon. (a) False (b) True
2. 2.A volcano is an opening in the Earth’s crust. Deep under the ground, rocks are so hot that they melt. This melted rock is called magma. When pressure builds up, magma pushes its way to the surface. Once it comes out, it is called lava. Lava can be hotter than 1,000 degrees Celsius. When it cools, it hardens into new rock. India’s only active volcano is on Barren Island in the Andaman Sea.
   
   What is melted rock under the ground called? (a) lava (b) ash (c) crust (d) magma
3. 3.Sound is made when something vibrates, or moves quickly back and forth. When you pluck a sitar string, it vibrates and makes a sound. The vibrations travel through the air to our ears. Sound can also travel through water and solids. In fact, it moves faster through solids than through air. Sound cannot travel through empty space, where there is no air. That is why space is completely silent. Loud sounds for a long time can harm our hearing.
   
   What does “vibrates” mean in the passage? (a) Breaks apart (b) Moves back and forth (c) Stays still (d) Becomes hot
4. 4.Sound is made when something vibrates, or moves quickly back and forth. When you pluck a sitar string, it vibrates and makes a sound. The vibrations travel through the air to our ears. Sound can also travel through water and solids. In fact, it moves faster through solids than through air. Sound cannot travel through empty space, where there is no air. That is why space is completely silent. Loud sounds for a long time can harm our hearing.
   
   Does sound move faster through solids or through air? (a) Through air (b) Through solids
5. 5.A volcano is an opening in the Earth’s crust. Deep under the ground, rocks are so hot that they melt. This melted rock is called magma. When pressure builds up, magma pushes its way to the surface. Once it comes out, it is called lava. Lava can be hotter than 1,000 degrees Celsius. When it cools, it hardens into new rock. India’s only active volcano is on Barren Island in the Andaman Sea.
   
   Why does magma push its way to the surface? (a) Pressure builds up (b) It cools down (c) Rain falls on it (d) The wind pulls it
6. 6.The Sun gives us a huge amount of energy every day. Solar panels can turn sunlight into electricity. They are made of special cells that work when light falls on them. Many homes in India now have solar panels on their roofs. Some villages use solar lamps after dark. Solar energy does not make smoke, so it keeps the air clean. Unlike coal, it will never run out. However, panels make less power on cloudy days.
   
   Why does solar energy keep the air clean? (a) It is very cheap (b) It uses coal (c) It makes no smoke (d) It runs out fast
7. 7.Earthworms are called the farmer’s friends. They dig tunnels as they move through the soil. These tunnels let air and water reach plant roots. Earthworms eat dead leaves and bits of rotting plants. Their waste, called castings, makes the soil rich. A field with many earthworms is usually healthy. Chemical sprays can kill these helpful creatures. So many farmers now use natural manure instead.
   
   What do earthworms eat? (a) Grain seeds (b) Fresh fruit (c) Live insects (d) Dead leaves
8. 8.A vaccine helps the body fight a disease before the disease attacks. It contains a weak or harmless form of a germ. The body’s defence system learns to recognise it. It then makes special fighters called antibodies. Later, if the real germ enters, the body knows how to beat it quickly. Children in India get vaccines against polio, measles and other diseases. Most vaccines are given as injections, but the polio vaccine can be given as drops. Vaccines have saved millions of lives.
   
   How can the polio vaccine be given? (a) As a tablet (b) As drops (c) As a bandage (d) As a cream
9. 9.In many Indian cities, people face water shortages in summer. Rainwater harvesting is one simple answer. Rain falling on rooftops is collected through pipes. It is then stored in tanks or sent into the ground through pits. Water sent into the ground raises the level of water in wells. A single roof can collect thousands of litres in one monsoon. Some states have made rainwater harvesting compulsory for new buildings. Saving rain today means more water tomorrow.
   
   What does “compulsory” mean here? (a) Done for fun (b) Not allowed (c) Must be done (d) Very costly
10. 10.The Sun gives us a huge amount of energy every day. Solar panels can turn sunlight into electricity. They are made of special cells that work when light falls on them. Many homes in India now have solar panels on their roofs. Some villages use solar lamps after dark. Solar energy does not make smoke, so it keeps the air clean. Unlike coal, it will never run out. However, panels make less power on cloudy days.
    
    Where do many Indian homes have solar panels? (a) In their gardens (b) In the kitchen (c) Under the floor (d) On their roofs
11. 11.The Sun gives us a huge amount of energy every day. Solar panels can turn sunlight into electricity. They are made of special cells that work when light falls on them. Many homes in India now have solar panels on their roofs. Some villages use solar lamps after dark. Solar energy does not make smoke, so it keeps the air clean. Unlike coal, it will never run out. However, panels make less power on cloudy days.
    
    True or false: Solar energy will run out one day. (a) False (b) True
12. 12.The Earth spins like a top on an imaginary line called its axis. One full spin takes about twenty-four hours. As the Earth spins, one half faces the Sun and has day. The other half faces away and has night. The Earth also moves around the Sun. One trip around the Sun takes about 365 days, which is one year. The tilt of the Earth’s axis gives us seasons. So spinning gives us day and night, while the tilt and the yearly trip give us seasons.
    
    What gives us seasons, along with the yearly trip? (a) The tilt of the axis (b) The clouds (c) The ocean (d) The Moon

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