List of top Questions asked in CBSE Class VIII

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?
Rashmi has a road map with a scale of 1 cm representing 18 km. She drives on a road for 72 km. What would be her distance covered in the map?
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
In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the ship is 28 m, how long is the model ship?
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
A photograph of a bacteria enlarged 50,000 times attains a length of 5 cm. What is the actual length of the bacteria? If the photograph is enlarged 20,000 times only, what would be its enlarged length?
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.
A machine in a soft drink factory fills 840 bottles in six hours. How many bottles will it fill in five hours?
A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. If 1 part of a red pigment requires 75 mL of base, how much red pigment should we mix with 1800 mL of base?
A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. In the following table, find the parts of base that need to be added.
Parts of red pigment1471220
parts of base8…………
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)
Do you think the Indian princes were short-sighted in their approach to the events of 1757?
Which picture, according to you, reveals the first sparks of the fire of revolt?
Who is an artisan? Why do you think the artisans suffered? (picture 3)
In picture 2 what do you understand by the Company’s “superior weapons”?
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?
What are the two different ideas about why so few animals were killed in the tsunami? Which idea do you find more believable?
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.