Question

Class - VIII
Sub - Science
M.M. - 70
Q1 Write answers of the following multiple choice questions. 1X10=10
1). Rayon is different from synthetic fibers because.
a) It has a silk like appearance.
b) It is obtained from wood pulp.
c) It's fibers can also be woven like those of natural fibers
2). Which of the following can be beaten into thin sheets.
a) Zinc
b) Phosphorus c) Sulphur
d) Oxygen
3). Burning of LPG is an example of
a) Rapid Combustion
b) Explosion
c) Spontaneous combustion d) None of these
4). Which of the following substance having highest calorific value.
a) LPG
b) Coal gas
c) Hydrogen d) Carbon dioxide
5). Cutting of a forest on large scale is called
a) Deforestation b) Afforestation
c) Reforestation d) Biosphere reserve
6). Part of the earth which support the bio diversity is called
a) Ecosystem Reserve b) National Parks
c)Sanctuary
d) Biosphere
7). The work of fire extinguisher is
a) Cut off the supply of air
b) Provide Oxygen
c) Provide Carbon dioxide
c) None of these
8). Identify the exhaustible natural resources
a) Coal
b) Natural Gas
c) Air
d) Both (a) and (b)
9). Naphthalene ball is obtained from
a) Coal Gas. b) Cake c) Coaltar d) Liquid ammonia
10). Which of these is a fossil fuel ?
a) Wood b) Paper c) Petroleum d) Phosphorus
Q.2 Fifin the blanks :
1x10=10
[ Petrochemicals, PVC, Poor conductor, Reactive , Hydrogen , 24)
1. Synthetic fiber are synthesised from raw material called Po
2. Bakelite is
of heat and electricity.
3. Water - pipes are made from
4. Metals produce
when hit by an object.
5. Phosphorus is a very non - metal.​

Answer 1

Answer:

Rayon is a manufactured regenerated cellulose fiber. It is made from purified cellulose, primarily from wood pulp, which is chemically converted into a soluble compound.

Hence.option (b) is correct.