Who Is Who, What Is What mcqs

Who Is Who & What Is What mcqs

who is who & what is what

Most Repeated mcqs of 2021

1. Which of the following is the lightest metal?
(a) Mercury
(b) Silver
(c) Lithium✔
(d) Lead

2. The most important ore of aluminum 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) Aluminum

4. An alloy used in making heating elements for
electric heating devices is:
(a) Solder
(b) Alloy steel
(c) Nichrome✔
(d) German silver

5: German silver is an alloy of:
(a) Copper, nickel and silver
(b) Silver, copper and aluminum
(c) Zinc, copper and nickel✔
(d) Silver, zinc and copper

6. Match the following:
A Aluminium 1. Monazite
B Uranium 2. Pitchblende
с Thorium 3.Bauxite✔
D Lead 4. Galena

7. Diamond is an allotropic form of:
(a) Silicon
(b) Carbon✔
(c) Sulphur
(d) Germanium

8. Air is a/an:
(a) Compound
(b) Element
(c) Mixture✔
(d) Electrolyte

9. Which of the following is the best conductor of
electricity?
(a) Ordinary Water
(b) Sea water✔
(C) Boiled water
(d) Distilled water
(e) Rain water

10. Balloons are filled with:
(a) Helium✔
(b) Oxygen
(c) Nitrogen
(d) Argon

11. The charcoal used to decolourise raw sugar is:
(a) Animal charcoal
(b) Sugar charcoal
(c) Coconut
(d) Wood charcoal✔

12. The most abundant metal in the earth’s crust is:
(2) Zinc
(b) Copper
(c) Aluminum✔
(d) Iron

13. Production of chlorofluorocarbons (CFC) gas
which is proposed to be banned in Pakistan, is
used in which of the following domestic
products?
(a) Television
(b) Tube light
(c) Cooking gas
(d) Refrigerator✔

14. The gas used to extinguish fire, is:
(a) Neon
(b) Nitrogen
(c) Carbon monoxide
(d) Carbon dioxide✔

15. In which of the following activities silicon
carbide is used?
(a)Making cement and glass
(b)Disinfecting water of ponds
(c) Making casts for statues
(d) Cutting very hard substances✔

16. The element common to all acids is:
(a) Carbon
(b) Hydrogen✔
(c) Oxygen
(d) Sulphur

17. Gobar gas contain mainly:
(a) Methane✔
(b) Carbon dioxide
(c) Butane
(d) Carbon monoxide

18. The most malleable metal is:
(a) Silver
(b) Gold✔
(c) Aluminum
(d) Sodium

19. Tetraethyl lead is used as:
(a) Mosquito
(b) Pain killer repellent
(c) Fire extinguisher
(d) Petrol additive✔

20. Which of the following is used in beauty
parlours for hair setting?
(a) Chlorine
(b) Sulphur ✔
(c) Phosphorus
(d) Silicon

21. Which of the following is a non-ferrous metal?
(a) Aluminum✔
(b) Iron
(c) Nickel
(d) Cobalt

22. Which of the following is a non-metal that
remain liquid at room temperature?
(a) Bromine✔
(b) Chlorine
(c) Helium
(d) Phosphorus

23. From which mineral is radium obtained?
(a) Limestone
(b) Hematite
(c) Pitchblende✔
(d) Rutile

24. What is laughing gas
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Hydrogen
(d) Nitrous oxide✔

25. Which of the following is used as a material for
making protective windows in space probes ?
(a) Steel
(b) Graphite
(c) Tungsten
(d) Diamond✔

26. Which form of phosphorus is used in safety
matches?
(a) White
(b) Yellow
(c) Red✔
(d) Black

27. 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

28. 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

29. Which of the following metals forms an
amalgam with other metals 7
(a) Lead
(0) Tin
(c) Zinc
(d) Mercury✔

30. Which of the following is not an ore of aluminum?
(a) Feldspar
(b) Bauxite
(c) Cryolite
(d) Azurite✔

31. Which of the following is an element?
(a) Ruby
(b) Sapphire
(c) Emerald
(d) Diamond✔

32. Most soluble in water is:
(a) Camphor
(b) Sugar✔
(c) Sulphur
(d) Common salt

33. Sodium metal is kept under:
(a) Water
(b) Alcohol
(c) Petrol
(d) Kerosene✔

34. Bromine is:
(a) A color less gas insoluble in water
(b) A highly inflammable gas
(c) A black solid
(d) A red liquid✔
(e) None of these

35. Which of the following statements about ‘dry
ice’ are correct?
1. It is a useful refrigerant.
2. On heating, it turns into a liquid.
3 It has acidic properties.
4. It causes burns when passed against the
skin
(a) 1 and 3✔
(b)1,2 and 3
(c) 2 and 4 and 4

36. Consider the following statements about aluminum:
1. It is the third most abundant element in the earth’s crust.
2 It is used to make over-head electric transmission lines
3. Aluminum vessels cannot be used for making alkali solutions
of these statements, the correct ones are:
(a)1 and 3
(b)2 and 3
(c) 1 and 2
(d) 1, 2 and 3✔

37. The metal used in storage batteries is:
(a)Iron
(b) Copper
(c) Lead✔
(d) Tin

38. Water has maximum density at:
(a)- 1°C
(b) 0°C
(e) 4°C✔
(d) 100°c

39. Non stick cooking utensils are coated with:
(a) black paint
(b) PVC
(c) Teflon✔
(d) polystyrene

40. The chemical name for urea is:
(a) Aneurin
(b) Chloroethene
(c) Carbamide✔
(d) None of these

41. Permanent hardness of water can be removed
by adding:
(a) Potassium
(b) Chlorine permanganate
(c) Bleaching powder
(d) Washing soda✔

42. The formula for Plaster of Pairs is:
(a) CaSO4
(b) CaSO4.2H2O
(c)2CaSO4.4H20
(d)2Caso H2O✔

43. Which of the following substances is bad conductor of electricity but a good conductor of heat?
(a) Asbestos
(b) Celluloid
(C) Purspecks
(d) Mica✔

44. Which of the following pairs does not contain a
colnage metal?
(a) Copper and
(b) Silver and Gold Gold
(c) Zinc and Gold✔
(d) Copper and Silver

45. Which of the following is used in pencils?
(a) Charcoal
(b) Silicon
(c) Phosphorus
(d) Graphite✔

46. Which of the following is the second most
abundant metal in the earth’s crust?
(a) Copper –
(b) Aluminum
(c) Iron✔
(d) Zinc

47. Carborundum is:
(a) Silicon dioxide
(b) Silicon carbide✔
(c) Silicon nitride
(d) Silicon phosphide

48. Glass Is made by heating the mixture of silica, quartz, soda potash, lead, calcium, culet and decolorize in suitable proportions to:
(a) 1000°C
(b) 850°c
(c) 500°C
(d) 1100°C✔

49. Name the instrument used for measuring humidity
(a) Barometer
(b) Thermometer
(c) Hygrometer✔
(d) Hydrometer

50.Most of the weather phenomena take place in which of the following layers of the atmosphere?
(a) Stratosphere
(b) Mesosphere
(c) Ionosphere
(d) Troposphere✔

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