_______ is a liquid metal.
  • Silver
  • Gold
  • Mercury
_________ is a non-metal which is a good conductor of electricity.
  • Oxygen
  • Iodine
  • Graphite
________ is a soft metal.
  • Sodium
  • Copper
  • Silver
When a metal reacts with oxygen in the presence of moisture and deteriorates, it is called _____________.
  • decomposition
  • corrosion
  • physical change
Copper forms a green layer of ___________ on exposure to moist air.
  • Copper hydroxide
  • basic copper carbonate
  • Copper phosphate
Rust is _________.
  • hydrated ferrous oxide
  • hydrated ferrous carbonate
  • hydrated ferric oxide
The rate of rusting ___________ with an increase of acidic gases.
  • decreases
  • increases
  • does not change
The process of applying a thin layer of Zinc metal on iron objects is called
  • greasing
  • rusting
  • galavanisation
The lower parts of bridges and ships are coated with ________.
  • oil paint
  • zinc
  • coal tar
A mixture of iron or steel with silicates is called __________.
  • enamel
  • coal tar
  • grease
The process of coating _________ metal on iron objects is called chrome-plating.
  • Zinc
  • Chromium
  • Tin
Metals have high density.
  • True
  • False
Pick the odd one out - a) oil b) grease c) paint d) water
  • Grease. The other three are used to prevent rusting.
  • water. The other three are used to prevent rusting.
  • Oil. The other three are used to prevent rusting.
Give reason-Containers of galvanised steel are not used for keeping food.
  • Because iron reacts with acids in food to produce toxic substances.
  • Because galvanised steel rusts easily.
  • Because Zinc reacts with acids in food to produce toxic substances.
Rust turns red litmus blue.
  • Because rust is basic in nature.
  • Because rust is acidic in nature.
  • Because rust is red in colour.
Doors and windows made of iron are first painted with _______ and then with oil paint.
  • Grease
  • Coal tar
  • Red lead
__________ has low density.
  • Gold
  • Sodium
  • Mercury
Only moisture is necessary for rusting.
  • True
  • False
Rust is _________ in nature.
  • basic
  • acidic
  • none of the above
________ is a ductile non-metal.
  • diamond
  • Carbon fibre
  • graphite
____________ has low tensile strength.
  • Gold
  • Iron
  • Zinc
Stainless steel is
  • an alloy of Copper.
  • an alloy of Aluminium.
  • an alloy of Iron.
Rusting is a slow process.
  • True
  • False
Which of the following are all examples of METALS?
  • glass, gold, copper, silver
  • copper, gold, bronze, plastic
  • wood, iron, aluminium, steel
  • copper, silver, iron, gold
Which words best describe NON-METALS?
  • ductile, shiny, brittle
  • malleable, dull, brittle, ductile
  • brittle, dull, insulators
Is being brittle a property for:
  • Metals
  • Non Metals
Iron is a good conductor, malleable and magnetic. What type of element is Iron?
  • Metal
  • Non Metal
  • Metalloid
  • Pretty
At room temperature metals are ____________.
  • plasma
  • gases
  • liquid
  • solid
Allows heat or electricity to go through
  • insulator
  • conductor
  • luster
  • ductile
The shine on metal when light falls on it.
  • luster
  • brittle
  • malleable
  • tarnish
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