MULTIPLE CHIOCE QUESTIONS

1. Which of the following is the lightest metal ?
(A) Mercury
(B) Silver
(C) Lithium
(D) Lead

2. The most important ore of Aluminium is —
(A) Bauxite
(B) Calamine
(C) Calcite
(D) Galena

3. The element present in the largest amount in rocks and minerals is —
(A) Carbon
(B) Silicon
(C) Hydrogen
(D) Aluminium

4. An alloy used in making heating elements for electric heating devices is —
(A) Solder
(B) Alloysteel
(C) Nichrome
(D) German Silver

5. German Silver is an alloy of —
(A) Copper, Silver & Nickel
(B) Silver, Copper & Aluminium
(C) Zinc, Copper & Nickel
(D) Silver, Zinc & Nickel

6. Air is a/an —
(A) Compound
(B) Element
(C) Mixture
(D) Electrolyte

7. Which of the following is the best conductor of Electricity ?
(A) Ordinary water
(B) Sea water
(C) Boiled water
(D) Distilled water

8. Balloons are filled with —
(A) Helium
(B) Oxygen
(C) Nitrogen
(D) Argon

9. The charcoal used to decolourise raw sugar is —
(A) Animal charcoal
(B) Sugar charcoal
(C) Cocoanut charcoal
(D) Wood charcoal

10. The most abundant metal in the earth’s crust is —
(A) Zinc
(B) Copper
(C) Aluminium
(D) Iron

11. The gas used to extinguish fire is —
(A) Neon
(B) Nitrogen
(C) Carbon dioxide
(D) Carbon Monoxide

12. In which of the following activities Silicon Carbide is used ?
(A) Making cement and glass
(B) Disinfecting water and ponds
(C) Making castes for statues
(D) Cutting very hard substances

13. The element common to all acids is —
(A) Oxygen
(B) Hydrogen
(C) Nitrogen
(D) Sulphur

14. Gobar gas contains mainly —
(A) Methane
(B) Carbon dioxide
(C) Butane
(D) Carbon Monoxide

15. The most malleable metal is —
(A) Silver
(B) Gold
(C) Aluminium
(D) Sodium

16. Tetraethyl lead is used as —
(A) Mosquito repellent
(B) Pain Killer
(C) Fire extinguisher
(D) Petrol additive

17. Which of the following is used in beauty parlours for hair setting ?
(A) Phosphorus
(B) Sulphur
(C) Chlorine
(D) Silicon

18. Which of the following is a non-metal that remains liquid in room temperature ?
(A) Bromine
(B) Chlorine
(C) Helium
(D) Phosphorus

19. From which mineral is radium obtained —
(A) Limestone
(B) Haematitie
(C) Pitchblende
(D) Rutile

20. What is laughing gas ?
(A) Carbon dioxide
(B) Sulphur dioxide
(C) Nitrogen Dioxide
(D) Nitrous oxide

21. Which of the following is used as a material for making protective windows in space probes ?
(A) Steel
(B) Graphite
(C) Tungsten
(D) Diamond

22. Which form of phosphorus is used in safety metals?
(A) Red Phosphorus
(B) White Phosphorus
(C) Yellow Phosphorus
(D) Black Phosphorous

23. Stainless steel is an alloy of —
(A) Iron, Carbon and Nickel
(B) Iron and Manganese
(C) Iron, Chromium and Zinc
(D) Iron, Chromium and Nickel

24. Which of the following is not correctly matched ?
(A) Galena : Lead Sulphide
(B) Green vitriol : Copper sulphate
(C) Plaster of Paris : Calcium sulphate
(D) Calomel : Mercurous Chloride

25. Which of the following metals forms an amalgum with other metals ?
(A) Lead
(B) Tin
(C) Zinc
(D) Mercury

Answers:
1. (C) 2. (A) 3. (B) 4. (C) 5. (C) 6. (C) 7. (B) 8. (A) 9. (D) 10. (C) 11. (C) 12. (D)

13. (B) 14. (A) 15. (B) 16. (D) 17. (B) 18. (A) 19. (C) 20. (D) 21. (D) 22. (A) 23. (D) 24. (B) 25. (D) 

 

 

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1. Which of the following is not an ore of Aluminium?
(A) Felsper
(B) Bauxite
(C) Cryolite
(D) Azurite

2. Most soluble in water is —
(A) Camphor
(B) Sugar
(C) Sulphur
(D) Common Salt

3. Bromine is —
(A) colourless gas insoluble in water
(B) A highly inflammable gas
(C) A Black solid.
(D) A red liquid.

4. The metal used in storage batteries —
(A) Iron
(B) Copper
(C) Lead
(D) Zinc

5. Water has maximum density at —
(A) –4°C
(B) 0°C
(C) 4°C
(D) 100°C

6. The chemial name of Uria is —
(A) Aneurin
(B) Chloroetane
(C) Carbamide
(D) None of these

7. Permanent hardness of water can be removed by adding —
(A) Potassium Permanganate
(B) Chlorine
(C) Bleaching Powder
(D) Washing Soda

8. The formula of Plaster of Paris is —
(A) CaSO₄
(B) CaSO₄, 2H₂O
(C) 2CaSO₄, 4H₂O
(D) 2CaSO₄, H₂O

9. Which of the following substance is a bad conductor of electricity but a good conductor of heat?
(A) Asbestos
(B) Celluloid
(C) Purspecks
(D) Mica

10. Carborandum is —
(A) Silicon Dioxide
(B) Silicon Carbide
(C) Silicon Nitride
(D) Silicon Phosphide

11. Which of the following is the best conductor of electricity ?
(A) Copper
(B) Mica
(C) Zinc
(D) Silver

12. Washing soda is the common name of —
(A) Calcium Carbonate
(B) Calcium Bi-Carbonate
(C) Sodium Carbonate
(D) Sodium Bi-Carbonate

13. The filament of electric bulb is made of —
(A) Iron
(B) Nichrome
(C) Tungsten
(D) Graphite

14. Bleaching powder is made from —
(A) Sulphur dioxide and gypsum
(B) Chlorine and Charcoal
(C) Soda ash and lime
(D) Lime and Chlorine

15. The two elements that are frequently used for making transistors are —
(A) Boron and Aluminium
(B) Silicon and Germenium
(C) Iridium and Tungsten
(D) Niobium and Columbium

16. Which of the following gas is not known as green house gas ?
(A) Methane
(B) Carbon dioxide
(C) Nitrous oxide
(D) CFC

17. Which of the following is not a neutral oxide ?
(A) Carbon Monoxide
(B) Sulphur Dioxide
(C) Water
(D) Nitric Oxide

18. Which of the following is used in making smoke bombs ?
(A) Sulphur
(B) Phosphorus
(C) Hydrogen
(D) Carbon

19. Caustic Soda is —
(A) Nacl
(B) Na₂CO₃
(C) NaOH
(D) NaHCO₃

20. Chemical formula of Water glass is —
(A) Na₂SiO₃
(B) Al₂O₃
(C) NaAlO₂
(D) CaSiO₃

21. Which of the following is not a bleaching agent?
(A) Sulpher di-oxide
(B) Carbon di-oxide
(C) Sodium hypochlorite
(D) Chlorine

22. The gas usually filled in electric bulb is —
(A) Hydrogen
(B) Oxygen
(C) Nitrogen
(D) Carbon di-oxide

23. Heavy water is —
(A) Tritium oxide
(B) Deuterium oxide
(C) Rain water
(D) Water at 4°C

24. The gases used in different types of welding would include —
(A) Oxygen & Hydrogen
(B) Oxygen, acetylene & argon
(C) Oxygen & acetylene
(D) Oxygen, hydrogen & nitrogen

25. Which of the following alloys is used for making magnets ?
(A) Duralumin
(B) Stainless Steel
(C) Alnico
(D) Magnelium

Answers:
1. (D) 2. (B) 3. (D) 4. (C) 5. (A) 6. (C) 7. (D) 8. (D) 9. (D) 10. (B) 11. (D) 12. (C)
13. (C) 14. (D) 15. (B) 16. (C) 17. (B) 18. (B) 19. (C) 20. (A) 21. (B) 22. (C) 23. (B) 24. (C) 25. (C)  

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1. Parmanent hardness of water may be removed by the addition of —
(A) Alum
(B) Sodium Carbonate
(C) Lime
(D) Potassium Permanganate

2. Potassium nitrate is used in —
(A) Salt
(B) Glass
(C) Fertiliser
(D) Medicine

3. In which type of rocks are metals like Gold and Copper mostly found ?
(A) Old igneous
(B) Old sedimentary
(C) Old metamorphic
(D) New metamorphic

4. Which of the following gases is lighter than air ?
(A) Carbon dioxide
(B) Oxygen
(C) Ammonia
(D) Chlorine

5. Which of the following is used as lubricant ?
(A) Graphite
(B) Silica
(C) Diamond
(D) Iron Oxide

6. The purest form of iron is —
(A) Steel
(B) Pig iron
(C) Cast iron
(D) Wrought iron

7. The percentage of carbon is the least in —
(A) Grey cast iron
(B) Wrought iron
(C) White cast iron
(D) Steel

8. The colour of Emerald is —
(A) Violet
(B) Yellow
(C) Deep Green
(D) Prussian Blue

9. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of —
(A) Nitrates
(B) Zeolites
(C) Sulphonates
(D) None of these

10. Rust is —
(A) A mixture of Fe₂O₃ and Fe(OH)₂
(B) A mixture of FeO and Fe(OH)₂
(C) FeO only
(D) A mixture of Fe₂O₃, 3H₂O and FeO

11. Liquefied Petroleum gas (LPG) consists of mainly —
(A) Methane, Ethane and Hexane
(B) Ethane, Hexane and Nonane
(C) Methane, Butane and Propane
(D) Methane, Hexane and Nonane

12. The metal that is present in Photo Films is —
(A) Mercury
(B) Platinium
(C) Magnesium
(D) Silver

13. Which of the following is in liquid form at room temperature ?
(A) Cerium
(B) Sodium
(C) Francium
(D) Lithium

14. Soda water contains —
(A) Nitrous acid
(B) Carbonic acid
(C) Carbon dioxide
(D) Sulphuric acid

15. Which of the following is basis of the modern periodic table ?
(A) Atomic mass
(B) Atomic number
(C) Atomic size
(D) Atomic volume

16. Of the following metals, which one pollutes the air of a big city ?
(A) Copper
(B) Cadmium
(C) Lead
(D) Chromium

17. Brass is an alloy of —
(A) Nickel and Copper
(B) Copper and Silver
(C) Nickel and Zinc
(D) Zinc and Copper

18. The element required for Solar energy conversion —
(A) Beryllium
(B) Silicon
(C) Tantalum
(D) Ultra pure carbon

19. Monazite is an ore of —
(A) Sodium
(B) Titanium
(C) Thorium
(D) Zirconium

20. Potassium Permanganate is used for purifying drinking water, because —
(A) It dissolves the impurities of water
(B) It is a sterilizing agent
(C) It is an oxidising agent
(D) It is a reducing agent.

21. The presence of which of the following salts in water causes corrosion in steam boilers ?
(A) Sodium Chloride
(B) Magnesium Chloride
(C) Calcium bicarbonate
(D) Potassium bicarbonate

22. Water is a good solvent of ionic salts because —
(A) It has no colour
(B) It has a boiling point
(C) It has a high dipole moment
(D) It has a high specific heat

23. The hardest substance available in earth is —
(A) Platinum
(B) Silicon
(C) Diamond
(D) Gold

24. Which of the following is the best conductor of electricity ?
(A) Zinc
(B) Copper
(C) Gold
(D) Silver

25. The ratio of pure gold in 18 carat gold is —
(A) 60%
(B) 75%
(C) 80%
(D) 100%

Answers:
1. (B) 2. (B) 3. (A) 4. (C) 5. (A) 6. (D) 7. (D) 8. (C) 9. (B) 10. (D) 11. (C) 12. (D)

13. (C) 14. (C) 15. (B) 16. (C) 17. (D) 18. (B) 19. (C) 20. (C) 21. (B) 22. (C) 23. (C) 24. (D) 25. (B)