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Worksheets

class 8th

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.
Yogurt and cheese  can be produced from ___________.
a)
Bacteria
b)
Virus
c)
Protozoa
d)
Algae
2.
Bacteria is known as ______________ in an ecosystem when feeding on dead organisms.
a)
decomposers
b)
herbivores
c)
pathogens
d)
infections
3.

The smallest microorganism on earth is as _____________

a)

a virus

b)

bacteria

c)

algae

d)

fungi

4.

Beneficial or Harmful?


fungus causes ringworm or athlete's foot on the skin

a)

beneficial

b)

harmful

5.

Which of the following plastics objects can be recycled?

i). Electric socket ii). Polythene bag iii).PVC pipe iv). Ashtray

a)

A and B

b)

B and C

c)

A and D

d)

C and D

6.
What are synthetic materials mostly made out of?
a)
Coal
b)
Oil
c)
Petroleum
d)
Natural Gas
7.
Which of the following is a synthetic fibre?
a)
Terrywool
b)
Terrycot
c)
Terylene
d)
All of them.
8.
Melamine is used for making
a)
kitchenware.
b)
floor tiles.
c)
fire-resistant fabrics.
d)
all of them.
9.
Acrylic fibres are a substitute for natural wool.
a)
True
b)
False
10.

Petroleum is mainly a mixture of which one of the following class

a)

Carbohydrates

b)

Carbogens

c)

Hydrocarbons

d)

Alcohols

11.

By which of the given processes is coal formed?

a)

Carbonisation

b)

Distillation

c)

Vapourisation

d)

Evaporation

12.

Ointments, candles,Vaseline etc. are made up of

a)

Lubricating Oil

b)

Petrol

c)

LPG

d)

Paraffin wax

13.

Refining of petroleum is done in

a)

Fractionating Column

b)

Zone refining Column

c)

Pronounce Column

d)

None of these

14.
When an object changes shape when struck by a hammer.
a)
luster
b)
malleable
c)
brittleness
d)
ductile
15.
Describe what luster means
a)
How an object reflects light
b)
How soft an object is
c)
If an object floats
d)
If an object can be dug out of the earth.
16.

By looking at the element illustrated here, how might you classify it by appearance?

a)

Metal

b)

Non-Metal

c)

Metalloid

17.

Metals are good conductor of

a)

Only heat

b)

Only electricity

c)

Heat and electricity both

d)

None of the above

18.
The organelle that is the control center of the cell.
a)
nucleus
b)
cell membrane
c)
ER
d)
ribosomes
19.
The jelly-like fluid that supports the organelles in place. 
a)
nucleus
b)
cell membrane
c)
chloroplast
d)
cytoplasm
20.

This organelle stores water and other materials. It is larger in plant cells.

a)

vacuole

b)

cell wall

c)

chloroplast

d)

cytoplasm