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

Suggest a suitable word for the following statement.

Chemicals added to food to prevent growth of microorganisms

Classify the following into friendly and harmful microorganisms.

Observe the figure and answer the questions that follows.

1. Write the name of the disease.
2. Name the causative agent of this disease?
3. How does the disease spread from one plant to another?
4. Name any two plant diseases and the microbes that cause them.

Observe the figure and answer the following questions.

1. Name the microorganism and the group to which it belongs.
2. Name the food item on which the organism grows.
3. Does it grow well in dry or in moist conditions?
4. Is it safe to eat infected bread?

Which of the following represents the correct match for items in Column A with those in Column B.

Why is it not advisable to burn plastic and synthetic fabrics?

Indicate whether the following statement is True or False. Also write the false statement in their correct form.

The fabric terywool is obtained by mixing terylene and wool

Materials which can be drawn into wires are called ductile. Which of the following is not a ductile material?

Which liquid metal is used for making thermometers?

If in the following figure, iron nail is replaced by a wooden stick, will the bulb glow or not? Justify your answer.

Find out the names of three metals and three non-metals from the box given as figure.

Fossil fuels are obtained from

If a person’s clothes catches fire, the best way to extinguish the fire is to

Choose the correct statement about inflammable substances from the following.

They have

Choose the incorrect statement from the following.

Forest fires are usually due to

When the clothes of a person catch ______ the person is covered with a ______ to extinguish fire. 

Some words (underlined) in the following sentence is jumbled up. Write them in their correct form.

Chittsmack does not burn by itself. 

State whether the following statement is True or False.

Carbon dioxide is an excellent fire extinguisher.

Write True/False against the following statement and also correct the false statement.

Water is the best extinguisher for fires involving electrical equipment.

Manu was heating oil to fry potato chips. The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. Do you think, this action was suitable? If yes, why? If not, why not? In such a condition what should Manu have done?