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Q 1. Which of the following properties is generally not shown by metals?
Ductility
Sonorous
Dullness
Electrical conduction
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Q 2. The most abundant element in the universe is:
hydrogen
oxygen
helium
carbon
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Q 3. Which of the following non-metal is a liquid?
Sulphur
Phosphorus
Carbon
Bromine
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Q 4. The liquid metal at room temperature is:
Mercury
Bromine
Sodium
Gold
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Q 5. The metal which is stored in kerosene:
Phosphorus
Magnesium
Sodium
Zinc
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Q 6. Materials around us can be classified into:
Elements and compounds
Metals and non-metals
Acids and bases
None of these
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Q 7. All metals are solids except:
Sodium
Calcium
Mercury
Hydrogen
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Q 8. Metal oxides are of nature:
Acidic
Basic
Neutral
All of these
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Q 9. The metal which can be cut with a knife:
Sodium and potassium
Barium and calcium
Sodium and mercury
Potassium and calcium
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Q 10. When non-metals react with water then:
Hydrogen gas is formed
Carbon dioxide gas is formed
Non-metals do not react with water
None of these
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Q 11. The metal which is liquid at room temperature is
sodium
bromine
calcium
mercury
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Q 12. Which one of the following metal is the most ductile?
Aluminium
Copper
Silver
Gold
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Q 13. Which one of the following metal is the most reactive and stored in kerosene?
Iron
Gold
Copper
Potassium
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Q 14. Name the gas evolved when magnesium reacts with dilute hydrochloric acid.
Chlorine
Oxygen
Hydrogen
Nitrogen
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Q 15. The metal which is not corroded by air, water and acid is
copper
zinc
aluminium
gold
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Q 16. Metals are
soft and brittle
hard and solid
liquid
generally liquid
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Q 17. Materials having qualities of both metals and non-metals are
alloys
metalloids
noble metals
none of these
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Q 18. Which metal reacts readily with cold water?
Gold
Silver
Magnesium
Calcium
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Q 19. The best electrical conductor is
gold
copper
silver
aluminium
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Q 20. Boron is
metal
metalloid
non-metal
alkali
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Q 21. Which of the following element is not found in free state in the nature?
Silver
Copper
Sodium
Gold
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Q 22. The difference between Pig and Wrought iron is as follows :
Pig iron is pure and Wrought iron is impure
Both Pig and Wrought iron are highly impure
Both Pig and Wrought iron are pure
Pig iron is impure and wrought iron is pure to a large extent
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Q 23. Epsom salt is
{tex}CuSO_4{/tex}
{tex}MgSO_4·7H_2O{/tex}
{tex}NH_2CONH_2{/tex}
{tex}(NH_4)_2SO4{/tex}
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Q 24. An ore gives off {tex}SO_2{/tex} when heated with {tex}O_2{/tex} This ore is concentrated by -
gravity separation method
magnetic separation method
froth flotation method
chemical method
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Q 25. Copper is extracted from the ore copper pyrite by smelting in a blast furnace. The flux used and the slag formed are as given below:
Flux CaO, Slag {tex}CaSiO_3{/tex}
Flux {tex}SiO_2{/tex}, Slag {tex}CaSiO_3{/tex}
Flux FeO, Slag {tex}FeSiO_3{/tex}
Flux {tex}SiO_2{/tex}, Slag {tex}FeSiO_3{/tex}