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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

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Class : Class 8

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Class : Class 8

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

One word answers are given for a few statements. Mark the answer which is not correct.

A Resources which will either never run out or are replaced within a reasonable period of time - Renewable resources.
B Wise and careful use of resources by not wasting them - Conservation.
C Conversion of wood into coal over million of years due to high temperature and pressure under the earth - Carbonisation.
D A black, viscous liquid extracted from the rocks which is a source of hydrocarbons - Coal tar.


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Class : Class 8

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Subject :NSO    Class : Class 8

Match column I with column II and choose the correct option from the codes given below.

Column I (Amorphous forms of carbon) Column II (Uses)
(P) Lamp black (i) For making electrodes for dry cell
(Q) Bone charcoal (ii) In gas masks
(R) Wood charcoal (iii) In extraction of metals
(S) Gas carbon (iv) To remove colour from sugarcane juice
(T) Coke (v) For making black shoe polish


P Q R S T
A (i) (v) (iii) (ii) (iv)
B (v) (iv) (ii), (iii) (i)
C (ii) (iii) (iv) (i) (v)
D (v) (iv) (ii) (i) (iii)


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