- Multiple choice questions [ MCQs ] 1. What source of pollution is the steam emitted from plants categorized in ?
a. Primary source
b. Secondary source
c. Tertiary source
D. Artificial source

2. The compound which is responsible for ozone layer depletion ?
a. Methyl chloroform
b. Carbon tetrachloride
c. Methyl bromide
D. Formaldehyde

3. What kind of food do seri - silkworms eat ?
a. castor leaf
b. mulberry leaf
c. castor flower
d. mulberry fruit

4. For how long can a queen honey bee live ?
a. about 2-3 years
b. about 6 weeks
c. about 24 weeks
d. up to 10 years

5. How many chromosomes are there in an unfertilized egg of the honey bee ?
a. 16 pairs
b. 32
c. 16
d. 8

6 . At what age do worker bees make wax and hexagonal wax cell of the comb ?
a. 1-3 days
b. 4-6 days
c. 7-11 days
d. 12 - 17 days

7. How many times does the silkworm larva moult ?
a. 2 times
b. 3 times
c. 4 times
d. 5 times

8. What is the salt formed by the reaction between carbon dioxide and lime water ?
a. Calcium bisulphate
b. calcium bicarbonate
c. calcium sulphate
d. calcium carbide

9. is a highly reactive element.
a. beryllium
b. magnesium
c. sodium
d. aluminium

10. The inert elements belong to :
a. Group I A
b. Group VII
c. Zero ( 0 )
d. Group I B

11. The d- block elements are also called
a. halogens
b. representative elements
c. transition elements
d. alkaline earth metals

12. There are groups in the modern periodic table.
a. 7
b. 18
c. 15
d . 10

- Please answer this correctly! Irrelevant / Random answers will be reported!*​