Question

1.
Choose the correct options.
a) Which of these is not a source of energy?
i. water
ii.
sun
iii. coal
W. plastic
b) Which of these does not need fuel?
i. cooking
ii. transportation
iii. combustion
iv. crystallization
c) Which of these is a secondary fuel?
i. biogas
ii. leaves
iii. wood
iv. twigs
d) Which of these does not help in starting fire?
i. water
ii. heat
iii. oxygen
iv. fuel​

Answer 1

Answer:

1.

a) plastic

b) crystallization

c) biogas

d) water

Answer 2

Answer:

1.= Coal

2 = crystallization

3 = biogas

4 = Water