Question

Q.1 Choose the correct answer:
1. A chemical change may involve:
a) change in colour only
change in temperature only
c) evolution of gas only
any or all of the above
2. Chemical change that is accompanied by absorption of heat energy is:
a) physical chemical change. b) exothermic chemical change
c) endothermic chemical change. d) none of these.
3. Which among the following is not a type of silk?
a) Mulberry silk
Tassar silk
c) Mooga silk
Moth silk
4 Silkwarms secrete fibre made of:
a) fat
b) cellulose
protein
d) proteins
d)nylon

Answer 1

Answer:

1) change in colour only 2) physical chemical change 3) mooga silk 4) nylon

Answer 2

Answer:

1.all of the above

2.endothermic chemical change

3.mooga silk

4.nylon