Question

2. Which of the following is not a combustible substance
( )
a) Camphor
b) Glass
c) Straw
d) Alcohol
3. In villages, people used wood as fuel because
( )
a) it is considered to be an ideal fuel b) of its easy availability and low
c) it is environment friendly
d) it catches fire easily
4. Coal is formed from the remains of
( )
a) vegetation only
b) animals only
c) both vegetation and animals
d) neither vegetation nor animals
5. Naphthalene balls are obtained from coal tar and are used as ( )
a) mosquito repellant
b) honeybee repellant
c) moth repellant
d) snake repellant
IL Answer the following.
2x1 = 2M
6. Expand PCRA.
7. What is the ignition temperature of phosphorus?
III. Answer the following.
1x 2 = 2M
8. Name two constituents of petroleum and write their uses also.
IV. Answer the following.
1x3 = 3M
9. Draw a neat labelled diagram of candle flame?
Biology-8M
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Answer 1

Answer:

2.a 3.b 4.c 5.c 8. CNG ang PSO