Vidaara.orgClass 8 · Mathematics
CodeVID-M8-WS
Materials: Metals and Non-Metals — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
Which of these is a property of most metals?
- A.Dull and brittle
- B.Lustrous and malleable
- C.Poor conductor of heat
- D.Breaks easily
2.
The ability of a metal to be beaten into thin sheets is called:
- A.Ductility
- B.Malleability
- C.Sonority
- D.Lustre
3.
Metals make a ringing sound when struck. This property is called:
- A.Ductility
- B.Malleability
- C.Sonority
- D.Hardness
4.
Which of these is a non-metal?
- A.Copper
- B.Iron
- C.Sulphur
- D.Aluminium
5.
Graphite is an unusual non-metal because it:
- A.Is shiny like gold
- B.Conducts electricity
- C.Is the hardest substance
- D.Is a liquid
6.
Which metal is a liquid at room temperature?
- A.Iron
- B.Mercury
- C.Copper
- D.Gold
7.
Metal oxides are generally:
- A.Acidic
- B.Basic
- C.Neutral always
- D.Magnetic
8.
Non-metal oxides are generally:
- A.Basic
- B.Acidic
- C.Metallic
- D.Magnetic
9.
When a metal reacts with a dilute acid, it usually releases:
- A.Oxygen
- B.Hydrogen
- C.Carbon dioxide
- D.Chlorine
10.
An iron nail dipped in copper sulphate solution gets a ___ coating.
- A.Brown (copper)
- B.Silver
- C.Black
- D.Golden
11.
A more reactive metal pushing out a less reactive metal from its salt solution is a:
- A.Displacement reaction
- B.Combustion reaction
- C.Physical change
- D.Distillation
12.
Copper and aluminium are widely used for electrical wires because they are:
- A.Poor conductors
- B.Good conductors of electricity
- C.Brittle
- D.Magnetic
13.
Which non-metal is needed by all living things for respiration?
- A.Nitrogen
- B.Oxygen
- C.Chlorine
- D.Carbon
14.
The brown layer formed on iron in moist air is called:
- A.Rust
- B.Bronze
- C.Lustre
- D.Galvanising
15.
Coating iron with zinc to prevent rusting is called:
- A.Displacement
- B.Galvanisation
- C.Sublimation
- D.Filtration
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
Sodium is stored under kerosene oil because it:
- A.Reacts vigorously with the moisture and oxygen in air
- B.Floats on kerosene only
- C.Is a non-metal
- D.Conducts no electricity
17.
A piece of zinc is added to copper sulphate solution but copper is NOT added to zinc sulphate solution that reacts. This shows that:
- A.Zinc is more reactive than copper
- B.Copper is more reactive than zinc
- C.Both are equally reactive
- D.Neither reacts ever
18.
Why does food cooked in an iron pan add some iron to our diet but a copper vessel must be used with care?
- A.Metals can slowly react with food; iron is helpful but excess copper salts are harmful
- B.Iron is poisonous
- C.Copper has no effect at all
- D.Both metals are non-reactive
19.
Sulphur dioxide gas dissolves in rain water to form acid rain. This is because the oxide of a non-metal is:
- A.Acidic
- B.Basic
- C.Neutral
- D.Metallic
20.
Aluminium does not rust away like iron even though it is reactive, because:
- A.A thin oxide layer forms and protects the metal underneath
- B.Aluminium is a non-metal
- C.Aluminium never reacts
- D.Aluminium is a liquid
21.
Ornaments are made of gold and silver rather than iron mainly because gold and silver:
- A.Are shiny and do not corrode easily
- B.Are the cheapest metals
- C.Are magnetic
- D.Rust quickly
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Lustrous and malleable
- (B) Malleability
- (C) Sonority
- (C) Sulphur
- (B) Conducts electricity
- (B) Mercury
- (B) Basic
- (B) Acidic
- (B) Hydrogen
- (A) Brown (copper)
- (A) Displacement reaction
- (B) Good conductors of electricity
- (B) Oxygen
- (A) Rust
- (B) Galvanisation
Section B — Challenge / Olympiad (2 marks each)
- (A) Reacts vigorously with the moisture and oxygen in air
- (A) Zinc is more reactive than copper
- (A) Metals can slowly react with food; iron is helpful but excess copper salts are harmful
- (A) Acidic
- (A) A thin oxide layer forms and protects the metal underneath
- (A) Are shiny and do not corrode easily
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