Coal and Petroleum — Science STD 8 — Question

Why is it never advised to sleep in a room with burning coal fire?

Anisha prepared a flowchart to show classification of fibres and plastics. She left few columns blank. Fill in the blanks by choosing the option with correct words.

Gibbous moon refers to:

Assertion (A) Water plays an important role in crop production.
Reason (R) It protects the crop from both frost and hot air current.

Which of the following is not a common property of plastics?

Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. This occasion is called:

Which of the following statement is not correct about carbon dioxide acting as a fire extinguisher for electrical fires?

Which of the following is the small rod shaped structure bound by a double membrane which helps in the oxidation of food to release energy?

Fibre produced in factories is called:

Lightning conductor