Class 8 Materials Metals And Non Metals CBSE Questions & Answers

Class 8 · Materials Metals And Non Metals

This is Science Class 8 Materials Metals and Non Metals CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Read the following statements :i) Non metals are soft.ii) Diamond is the hardest non metal.
  • A
    both are wrong
  • B
    both are correct
    Correct
  • C
    statement ii) is correct but i) is wrong
  • D
    statement i) is correct but ii) is wrong
2
Sodium and Potassium are always kept in kerosene but Magnesium is not because :
  • A
    Magnesium doesn
  • B
    Magnesium hardly reacts with cold water
    Correct
  • C
    Sodium hardly reacts with cold water
  • D
    Potassium hardly reacts with cold water
3
If Chlorine is added to Potassium Iodide solution ____ is formed :
  • A
    NaCl
  • B
    NaI
  • C
    KCl
    Correct
  • D
    KI
4
______ of non metals will dissolve in water to form acids.
  • A
    sulphates
  • B
    Oxides
    Correct
  • C
    hydrides
  • D
    chlorides
5
Read the following statements :i) Metals like Zinc & Nickel take much longer to oxidise.ii) Palladium & Platinum do not react with atmosphere at all.
  • A
    statement ii) is correct but i) is wrong
  • B
    statement i) is correct but ii) is wrong
  • C
    both are wrong
  • D
    both are correct
    Correct
6
At a higher temperature, the metal is :
  • A
    less ductile
  • B
    same ductile as earlier it was
  • C
    more ductile
    Correct
  • D
    non ductile
7
Read the following statements :i) Non metals are poor conductor of heat.ii) Diamond is a non metal and good conductor of heat.
  • A
    both are wrong
  • B
    statement ii) is correct but i) is wrong
  • C
    statement i) is correct but ii) is wrong
  • D
    both are correct
    Correct
8
Tip of a matchstick has _____ in it :
  • A
    phosphorus
    Correct
  • B
    sodium
  • C
    potassium
  • D
    carbon
9
Read the following statements :i) Non metals are good conductors of electricity.ii) Graphite is a non metal and good conductor of electricity.
  • A
    both are correct
  • B
    statement ii) is correct but i) is wrong
    Correct
  • C
    both are wrong
  • D
    statement i) is correct but ii) is wrong
10
Tungsten is used in incandescent bulb because tungsten :
  • A
    high malleability & ductility
  • B
    has very low melting point
  • C
    sonorosity
  • D
    has very high melting point
    Correct
11
Read the following statements: i) Nitrogen is an inactive liquid non metal. ii) Fluorine is an extremely reactive gaseous non metal.
  • A
    statement ii) is correct but i) is wrong
    Correct
  • B
    both are correct
  • C
    both are wrong
  • D
    statement i) is correct but ii) is wrong
12
Choose the correct ascending order of reactivity :
  • A
    Iron< Copper < Zinc < Aluminium
  • B
    Copper < Iron < Zinc < Aluminium
    Correct
  • C
    Zinc < Aluminium < Copper < Iron
  • D
    Aluminium < Copper < Iron < Zinc
13
The non-metal used in food packaging and canning is :
  • A
    Chlorine
  • B
    Nitrogen
    Correct
  • C
    Sulphur
  • D
    Oxygen
14
Which reaction will not release hydrogen gas ?
  • A
    Zinc with Sulphuric acid
  • B
    Potassium with water
  • C
    Hot Iron with steam
  • D
    Magnesium oxide with water
    Correct
15
Match the following :non metal…………………usesi) phosphorus……………a) fire crackerii) chlorine………………..b) matchesiii) iodine…………………c) lubricant in electric motoriv) sulphur……………….d) bleaching powderv) graphite………………e) antiseptic
  • A
    i.b,ii.e,iii.d, iv.c, v.a
  • B
    i.d,ii.a,iii.b, iv.e, v.c
  • C
    i.c,ii.e,iii.d, iv.a, v.b
  • D
    i.b,ii.d,iii.e, iv.a, v.c
    Correct