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Class 10 Science Metals and Non Metals Practice Worksheet


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Multiple Choice Questions:

1) The percentage of lead pencil is:
a)Zero
b)20
c)80
d)70
2) Which of the following metals occur in their pure state?
a)Copper
b)Iron
c)Zinc
d)Gold
3) Silicone is used in
a)Solar energy devices
b)Semiconductors
c)Transistors
d)All of these
4) Which of the following is a noble metal?
a)Copper
b)Iron
c)Gold
d)Aluminum
5) When a metal is added to dilute HCI solution, there is no evolution of gas. Metal is
a)K
b)Na
c)Ag
d)Zn
6) Removal of impurities from ore is known as
a)Crushing and grinding
b)Concentration of ore
c)Calcinations
d)Roasting
7) Concentrated sulphuric acid acts as:
a)Oxidizing agent
b)Dehydrating agent
c)Both
d)None of these
8) Forth floatation method is used for the concentration of
a)Oxide ores
b)Sulphide ores
c)Sulphate ores
d)Halide ores
9) Nature of SO2 is:
a)Basic
b)Acidic
c)Amphoteric
d)Neutral
10) Heating of concentrated ore in absence of air for conversion into oxide ore is known as
a)Roasting
b)Calcinations
c)Reduction
d)None of these
11) Which of the following metal will not displace hydrogen from steam, dilute acids and alkalies?
a)Iron
b)Zinc
c)Mercury
d)Calcium
12) Which reducing agent is used in chemical reduction
a)C
b)CO
c)AI
d)None of these
13) What is anode mud
a)Fan of anode
b)Metal of anode
c)Impurities collected at anode in electrolysis during purification of metals
d)All of these
14) When a non- metal reacts with chlorine, it forms
a)An ionic chloride
b)A covalent chloride
c)A tetrachloride
d)A dichloride
15) Which f the following methods are suitable for preventing an iron frying pan from rusting?
a)Applying grease
b)Applying paint
c)Applying a coating of zinc
d)All of the above
16) Out of the following, which cannot be obtained by electrolysis of aqueous solution of the salt?
a)Ag
b)Mg
c)Cu
d)Cr
17) Aluminum is used in thermite welding because
a)Aluminum is a light metal
b)Aluminum has more affinity for oxygen
c)Aluminum is a strong oxidizing agent
d)Aluminum is a reactive metal

18) Which of the following process is used for the concentration of Bauxite (AI2O3. 2H2O)?
a)Forth floatation
b)Leaching
c)Liquation
d)Magnetic separation
19) The best malleable metal is
a)Aluminum
b)Silver
c)Gold
d)Lead
20) The process of extraction of metal from its ores, is known as
a)Concentration
b)Calcination
c)Purification
d)Metallurgy
21) Which is used as catalyst in Haber’s process?
a)Cr
b)AI
c)Ni
d)Fe
22) The process to heat the ore in the presence of excess supply of air below its melting point is called
a)Roasting
b)Calcination
c)Smelting
d)Liquation
23) Stainless steel is usually made by alloying iron with:
a)Fe and Cu
b)Cu and Cr
c)Cu ad Ni
d)Cr and Ni
24) Which of the following metals constitutes the alloys magnalium
a)Al, Cu
b)Al, Fe
c)Al, Mg
d)Al, Mn
25) One of the constituents of amalgam is
a)Aluminum
b)Copper
c)Iron
d)Mercury
26) German silver is an alloy of:
a)Copper
b)Magnesium
c)Lead
d)Iron
27) The white phosphorus is stored
a)In air
b)Under water
c)Under kerosene
d)Under CS2
28) Bronze is an alloy of copper and:
a)Tin
b)Aluminum
c)Zinc
d)Lead
29) The chief ore of aluminum is
a)Bauxite
b)Cryolite
c)Alunite
d)Feldspar
30) Formula of magnetite is
a)Fe2O3
b)FeS2
c)FeCO3
d)Fe3O4

ANSWERS
1) a
2) d
3) d
4) c
5) c
6) b
7) c
8) b
9) b
10) b
11) c
12) d
13) c
14) b
15) c
16) b
17) b
18) b
19) c
20) d
21) d
22) a
23) d
24) c
25) d
26) a
27) b
28) a
29) a
30) d

 

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