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Question-1 _____________ is used for thermometers and barometers.

(A) iron	(B)silver
(C)Mercury	(D)platinum

Question-2
Phosphorous reacts with oxygen to give

(A) Acidic oxide	(B) Basic oxide
(C) Neutral oxide	(D) Peroxides

Question-3
Metals except sodium and potassium have

(A) High densities	(B) Low densities
(C) Different colours	(D) Low tensile strength

Question-4
What metal is used to make electrical wires and cable for domestic or industrial usage?

(A) Sodium	(B) aluminium
(C) potassium	(D) gold

Question-5
Which is used for making aeroplane,spacecraft seaships and pressure cookers?

(A) Magnalium	(B) Duralumin
(C) alnico	(D) bronze

Question-6
A mineral from which a metal can be extracted on a commercial scale economically and easily, is called

(A) Ores	(B) Minerals
(C) Free metal	(D) Couple

Question-7 The process of heating an ore strongly below its melting point in the presence of an excess of air is called_______________________.

(A) leaching	(B)roasting
(C)calcination	(D)froth flotation method

Question-8
If the density of the ore is less,______________ method is used.

(A) Magnetic separation method	(B) Leaching process
(C) Froth flotation process	(D) Calcination

Question-9
Graphite and iodine are the only non-metals have

(A) Malleability	(B) Ductility
(C) Metallic lustre	(D) Same colour

Question-10
Hydrogen reacts with oxygen to give

(A) Acidic oxide	(B) Basic oxide
(C) Neutral oxide	(D) Peroxide

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Std 8

ICSE/ISC

Practice in Related Chapters
Hydrogen
Structure of Atom
Transformation of Substances
Metals and nonmetals
Carbon and its Compounds