Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions for Science

Name the process in yeast that converts sugars into alcohol.

What will happen to ‘pooris’ and ‘unused kneaded flour’ if they are left in the open for a day or two?

Observe the set-up given in figure and answer the following questions.

1. What happens to the sugar solution in A?
2. Which gas is released in A?
3. What changes will you observe in B when the released gas passes through it? 

How can we prevent the following diseases?

Cholera

How can we prevent the following diseases?

Typhoid

Complete the following cycle given as figure by filling the boxes (a), (b), (c), (d).

Polycot is obtained by mixing

Unscramble the jumbled word given below, related to synthetic material.

Lopmery

Unscramble the jumbled word given below, related to synthetic material.

Relyteen

Unscramble the jumbled word given below, related to synthetic material.

Yespolter

Consider the list of terms given below:

1. Seismic zone
2. Fault zone
3. Mantle
4. Inner core

The boundaries of the earth’s plate are known as

The aluminium strips in an electroscope as shown in the following figure are replaced by plastic strips and a charged body is brought in contact with the metal clip. What will happen?

In an electroscope, if a negatively charged body is brought in contact with the metal dip, the strips of the electroscope diverge. If now another charged object carrying equal amount of positive charge is brought in contact with the clip, what will happen?

The strips of an electroscope diverge when a charged body is brought in contact with the metal clip. Now the clip is touched gently by our hand. What will happen to the strips? Explain.

If the metal clip used in the electroscope is replaced by an ebonite rod and a charged body is brought in contact with it, will there be any effect on the aluminium strips? Explain.

Damaged seeds would _________ on top of water.

For growing a crop, sufficient sunlight and _________ and _________ from the soil are essential.

Write a paragraph in your own words of the following.

Sowing

Name the microorganisms which can fix atmospheric nitrogen in the soil.

Write 10 lines on the usefulness of microorganisms in our lives.