CBSE Class 8 Science Materials Metals And Non Metals Assignment Set A

Question. Metals can be obtained economically from:-
(A) Minerals
(B) Ores
(C) Earth's crust
(D) None

Answer: B

Question. Hoope's process is used for the purification of :-
(A) Cu
(B) Fe
(C) Al
(D) At

Answer: C

Question. Lightest liquid metal is :-
(A) Hg
(B) Cs
(C) Ga
(D) None of these

Answer: B

Question. Which of the following have low melting and boiling points ?
(A) Phosphorus
(B) Sodium
(C) Iron
(D) (A) and (B)

Answer: D

Question. Which of the following metals catch fire on reaction with water ?
(A) Sodium
(B) Potassium
(C) Magnesium
(D) (A) and (B)

Answer: D

Question. Nitric acid can be prepared by which of the following method ?
(A) Birkeland - eyde process
(B) Ostwald process
(C) Contact process
(D) (A) & (B) both

Answer: D

Question. Calgon is a substance which is used to remove the hardness of water. The formula of calgon is :-
(A) Na₂[Na₄(PO₃)₆]
(B) Na₂Al₂Si₂O₈
(C) FeSO₄(NH₄)2. SO₄. 6H₂O
(D) Na₂S₂O₃. 5H₂O

Answer: A

Question. Which of the following is/are used as bleaching agent ?
(A) SO₂
(B) H₂S
(C) Cl₂
(D) All

Answer: D

Question. Type metal is an alloy of :-
(A) Pb and Sn
(B) Pb, Sn and Sb
(C) Cu and Zn
(D) Cu, Sn and Sb

Answer: D

Question. Rusting of iron can be prevented by :-
(A) Alloying
(B) Painting
(C) Galvaning
(D) All of these

Answer: D

Question. Which of the following is a good conductors of heat and electricity ?
(A) Graphite
(B) Oxygen
(C) Chlorine
(D) Nitrogen

Answer: A

Question. Magnetite is an oxide of metal X. The metal is :-
(A) Mn
(B) Mg
(C) Fe
(D) Cu

Answer: C

Question. Metals are :-
(A) Malleable
(B) Ductile
(C) None
(D) Both

Answer: D

Question. Mercury is also called :-
(A) Liquid gold
(B) Liquid copper
(C) Liquid silver
(D) None of these

Answer: C

Question. Metals like gold, platinum which do not easily react are called :-
(A) Active metals
(B) Dull metals
(C) Noble metals 
(D) Bright metals

Answer: C

Question. When MgO is dissolved in water, Mg(OH)₂ is obtained. A red litmus paper dipped in this solution turns blue, this shows that the solution is ............ in nature :-
(A) Acidic
(B) Neutral
(C) Alkaline
(D) Reactive

Answer: A

Question. A metal, which forms a protective layer of its oxide on reaction with water, on its surface is :-
(A) Sodium
(B) Aluminium
(C) Potassium
(D) Magnesium

Answer: B

Question. 90% of sun's mass is :-
(A) He
(B) H₂
(C) O₂
(D) Ar

Answer: B

Question. Reactivity series gives :-
(A) Arrangement of metals in the order of decreasing reactivity
(B) Arrangement of non-metals in the order of decreasing reactivity
(C) Arrangement of metals in the order of increasing reactivity
(D) Arrangement of non-metals in the order of increasing reactivity

Answer: A

Question. Carnallite (KCl . MgCl₂ . 6H₂O) is an ore of :-
(A) Chlorine
(B) Iodine
(C) Astatine
(D) Bromine

Answer: D

1.Give one example of each: metals and non-metals.

2.Name the metal, which is the best conductor of heat and electricity.

3.Name the property by which metals can be drawn into thin wires. <

4.Name the gas produced, when metals reacts with acids.

5.What is the color of the copper sulphate solution?

6.State the nature of oxides of non-metals.

7.Which metal is stored in kerosene?

8.Name the property of the metal by which it can be drawn into thin sheets.<

9.What happens when sulphur reacts with oxygen?

10.Which non-metal catches fire, if exposed to air?

11.Name the gas that burns with a POP sound.

12.What are Displacement reactions?

13.Give one use of non-metal in our daily life.

14.What are metalloids?

15.Which metal is use to wrap food items?

16.Which among the following is a non-metal:
(A) Copper.
(B) Zinc.
(C) Iron.
(D)Wood.

17.Which among the following is a metal?
(A) Zinc.
(B) Wood.
(C) Rubber.
(D) Plastic.

18.Which among the following is the best conductor of electricity?
(A) Silver.
(B) Iron.
(C) Aluminum..
(D) Copper.

19.All ___________ are good conductors of heat and electricity.
(A) Metals.
(B) Non-metals.
(C) Metalloids.
(D) Gases.

20.Which metal can be easily cut with a knife?
(A) Iron.
(B) Aluminum.
(C) Sodium.
(D) Zinc.

21.Which among the following shows the correct meaning of malleable for metals?
(A) They are sonorous.
(B) They can be drawn into sheets.
(C) They can be drawn into wires.
(D) None of these.

22.Which among the following shows the correct meaning of ductility for metals?
(A) They can be drawn into wires.
(B) They can be drawn into.
(C) They are shiny.
(D) None of these.

23.Non-metal used in purification of water is:
(A) Nitrogen.
(B) Oxygen.
(C) Sulphur.
(D) Chlorine.

24.Which metal is widely used in making jewellery?
(A) Iron.
(B) Zinc.
(C) Gold.
(D) Copper.

25.Zinc displaces copper from its salt solution is an example of:
(A) Decomposition Reaction.
(B) Combination Reaction.
(C) Displacement Reaction.
(D) None of these.

26.Which metal among the following is used in wrapping the food materials?
(A) Aluminum.
(B) Sodium.
(C) Iron.
(D) None of these.

27.Which gas is produced when metals react with sulphuric acid?
(A) Oxygen.
(B) Hydrogen.
(C) Nitrogen.
(D) None of these.

28.Which element catches fire if exposed to air?
(A) Sulphur.
(B) Phosphorous.
(C) Sodium.
(D) None of these.

29.Metals react with sodium hydroxide to produce ________gas.
(A) Hydrogen.
(B) Oxygen.
(C) Nitrogen.
(D) None of these.

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