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Class 8 - Chemistry Set 2
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1. Combustion is a/an
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1 point
endothermic process
exothermic process
reversible process
all of these
2. An example of thermosetting plastic which is also a poor conductor of heat and electricity –
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Polythene
Bakelite
Polyester
None of these
3. Why does a match stick not catch fire on its own at room temperature ?
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A substance cannot catch fire at room temperature
Matchstick requires a high ignition temperature
Friction of matchstick with matchbox raises the temperature to ignition temperature
None of these
4. Handles of frying pans are made of plastics because
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they can be reused.
they are durable and moulded into different shapes.
they are poor conductor of heat and electricity.
they are low in cost.
5. Ganga action plan deals with
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Cleaning ganga
Purify water
Supplying water
All of these
6. Which synthetic fibre was discovered first ?
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Rayon
Nylon
Polyester
None of these
7. Natural gas is a very important fossil fuel because
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it is easy to transport through pipes.
it is a mixture of various constituents.
it is used as a fuel in many industries.
it is tough, porous and black substance.
8. When super heated steam is passed through
red hot coke, it gets reduced to a mixture of X,
Y and it is named as Z. Identify X.
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1 point
NO2
CO
SO2
CO2
9. An example of thermosetting plastic which is also a poor conductor of heat and electricity –
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1 point
Polythene
Bakelite
Polyester
None of these
10. The clothes we wear are made up of
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jute
fabric
filament
coir
11. Cotton is obtained from
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stalk of a plant.
pulp of fruits.
cell wall of plant cell.
cytoplasm of a cell.
12. Metals which play important role in the country's economy and defence are called.
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native metal
dynamic metal
strategic metal
none of these
13. Identify the incorrect characteristic of an ideal fuel ?
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It should be easy to handle, store and transport.
It should have low cost and be easily available.
It should have a low ingnition temperature
It should have a moderate rate of combustion.
14. Chronic exposure of arsenic causes.
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1 point
Black foot disease
Cataract
Photo burning
Mutations
15. Find out the odd one on the basis of reaction with water -
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Aluminium
Sodium
Copper
Zinc
16. Which out of the following elements is ductile? (i) C (ii) Ca (iii) K (iv) Cu
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(i) only
(ii) only
(iii) only
(iv) only
17. The raw material for the production of synthetic fibres are obtained from ______and ______.
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Crude oil, petroleum oil
Rice, Wheat
Crude oil, Rice
None of these
18. Which of the following statements is/are true about graphite? (i) It is a metal. (ii) It is a good conductor of electricity. (iii) It has one free electron. (iv) It is a non-metal.
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(i) & (iii)
(i), (ii) & (iii)
(ii), (iii) & (iv)
(i), (iii) & (iv)
19. A liquid fossil fuel viscous in nature is
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Vegetable oil
Groundnut oil
Crude oil
CNG
20. Chlorination of treated waste water is required for
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killing all microbes
removing suspended materials
complete breakdown of organic matter
all of the above
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