Question

Which of the following metals catch fire on reaction with air?

a) Magnesium

b) Manganese

c) Potassium

d) Calcium

15. What is the main chemical component present in striking surface of a matchbox?

a) Potassium chlorate

b) Phosphorus

c) Potassium

d) Graphite

16. Which of the following diseases is caused by a bacteria?

a) Chicken pox

b) Tuberculosis

c) Dengue

d) Polio

17. Carbonisation is

a) Slow conversion of dead vegetation into coal

b) Deposition of soil

c) falling of trees

d) None of these

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Answer 1

Answer:

1. ans....- c) potassium..

2. ans ...- c) graphite...

3. ans ....- c) polio....

4.ans ...- d) none of these

Answer 2

Answer:

Potassium

phosphorus

tuberculosis

slow conversion of dead vegetative into coal