List of top Science Questions asked in CBSE Class VIII

Write a paragraph in your own words on each of the following.
1. Preparation of soil
2. Sowing
3. Weeding
4. Threshing

Give two examples of each.
1. Kharif crop
2. Rabi crop

Give two differences between a zygote and a foetus.

Write a short paragraph on the harmful effects of microorganisms.

Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.

Match items in column A with those in column B. 

The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain.

Prepare a list of objects around you that are electroplated.

Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

You spill a bucket of soapy water on a marble floor accidently. Would it make it easier or more difficult for you to walk on the floor? Why

Describe characteristics and uses of coke.

What are the major groups of microorganisms?

What are weeds? How can we control them?

The following Table shows the total power shortage in India from 1991–1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

S. No.	Year	Shortage (%)
1	1991	7.9
2	1992	7.8
3	1993	8.3
4	1994	7.4
5	1995	7.1
6	1996	9.2
7	1997	11.5

Name the scale on which the destructive energy of an earthquake is measured. An earthquake measures 3 on this scale. Would it be recorded by a seismograph? Is it likely to cause much damage?

Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?

What is the term used for chemical secretions of endocrine glands responsible for changes taking place in the body?

Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room. Explain.

When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?

List sources of noise pollution in your surroundings.

Explain the importance of reproduction in organisms.

Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig.

Draw the reflected ray from the second mirror.

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Explain how you can take care of your eyes.