List of top Science Questions asked in CBSE Class VIII

Differentiate between the following. 

1. Wildlife sanctuary and biosphere reserve 
2. Zoo and wildlife sanctuary 
3. Endangered and extinct species 
4. Flora and fauna

Complete the word puzzle.
Down
1. Species on the verge of extinction.
2. A book carrying information about endangered species.
5. Consequence of deforestation.
Across
1. Species which have vanished.
3. Species found only in a particular habitat.
4. Variety of plants, animals and microorganisms found in an area.

Why should paper be saved? Prepare a list of ways by which you can save paper

Find out about national parks in your state. Identify and show their location on the outline map of India.

Gurmit wanted to perform an activity using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher’s advice?

How can you contribute to the maintenance of green wealth of your locality? Make a list of actions to be taken by you.

Answer in brief. 

1. Why should we conserve biodiversity? 
2. Protected forests are also not completely safe for wild animals. Why? 
3. Some tribals depend on the jungle. How? 
4. What are the causes and consequences of deforestation? 
5. What is Red Data Book? 
6. What do you understand by the term migration?

Draw a labelled sketch of the human eye.

What will happen if. 

1. we go on cutting trees. 
2. the habitat of an animal is disturbed.
3. the top layer of soil is exposed

Describe the construction of a kaleidoscope.

Choose the correct option.
Image formed by a plane mirror is

Choose the correct option.
Angle of incidence is equal to the angle of reflection.

Fill in the blanks in the following.
1. A person 1 m in front of a plane mirror seems to be ___ m away from his image.
2. If you touch your ___ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with ___.
3. The size of the pupil becomes ___ when you see in dim light.
4. Night birds have ___ cones than rods in their eyes.

Discuss the effects of deforestation on the following.

1. Wild animals 
2. Environment 
3. Villages (Rural areas) 
4. Cities (Urban areas) 
5. Earth 
6. The next generation

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

State the laws of reflection.

Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.
1. Polished wooden table
2. Chalk powder
3. Cardboard surface
4. Marble floor with water spread over it
5. Mirror
6. Piece of paper

Fill in the blanks.

1. A place where animals are protected in their natural habitat is called ____ .
2. Species found only in a particular area is known as ____ .
3. Migratory birds fly to far away places because of ____ changes.

Tick True/False against the following statements.

1. Fossil fuels can be made in the laboratory.           (T/F)
2. CNG is more polluting fuel than petrol.                  (T/F)
3. Coke is almost pure form of carbon.                       (T/F)
4. Coal tar is a mixture of various substances.          (T/F)
5. Kerosene is not a fossil fuel.                                     (T/F)

Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain why?

Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house would you suggest your parents should buy? Explain your answer.

A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.

Name the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket do not bring a change in its state of motion.

A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?

Explain in what way noise pollution is harmful to human.