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1250 Important Chemistry MCQ Question and Answer PDF

4000 Important General Science MCQ Question & Answer in PDF Download

1.German silver used for making utensils is an alloy of

  • ACopper, nickel and silver
  • BSilver, Copper and aluminium
  • CZinc, Copper and nickel
  • DZinc, silver and Copper
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Correct Answer : (C)

Zinc, Copper and nickel
Explanation:

2.A metal is exposed to the atmosphere for some time. It becomes coated with green carbonate. The metal must be

  • ASilver
  • BCopper
  • CAluminium
  • DZinc
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Correct Answer : (B)

Copper
Explanation:

3.Which of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torch lights, electric shavers, etc.?

  • AIron and cadmium
  • BNickel and cadmium
  • CLead peroxide and lead
  • DZinc and carbon
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Correct Answer : (D)

Zinc and carbon
Explanation:

4.Metal are good conductors, because

  • AThey contain free electrons
  • BThe molecules in them are very close to each other
  • CThe molecules in them collide very freely
  • DThey contain reflecting surface
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Correct Answer : (A)

They contain free electrons
Explanation:

5.The first metal used by a man was

  • ACopper
  • BSilver
  • CBronze
  • DBrass
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Correct Answer : (A)

Copper
Explanation:

6.Drinking soda is

  • AAlkaline
  • BNeutral
  • CAcidic
  • DOxidant
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Correct Answer : (C)

Acidic
Explanation:

7.The cathode of a lead storage battery is made up of

  • AZinc
  • BLead
  • CLead oxide
  • DManganese dioxide
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Correct Answer : (B)

Lead
Explanation:

8.Among the following iron ores, the highest percentage of iron content is found to

  • AHaematite
  • BMagnetite
  • CLimnonite
  • DNone of these
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Correct Answer : (A)

Haematite
Explanation:

9.Pasteurisation of milk means ?

  • AHeating of milk to above 720C
  • BHeating of milk to above 620C
  • CCooling of milk to about 620C
  • DCooling of milk to about 100C
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Correct Answer : (B)

Heating of milk to above 620C
Explanation:

10.Aluminium can be purified by 

  • AOxidation
  • BDistillation
  • CElectrolysis
  • DOzonolysis
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Correct Answer : (C)

Electrolysis
Explanation:

11.Impure camphor is purified by

  • ASublimation
  • BFractional crystallisation
  • CFractional distillation
  • DSteam distillation
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Correct Answer : (A)

Sublimation
Explanation:

12.Greenhouse effect is caused by

  • ANitrogen
  • BCarbon dioxide
  • CCarbon monoxide
  • DNitrogen dioxide
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Correct Answer : (B)

Carbon dioxide
Explanation:

13.Type metal used in printing press is an alloy of

  • ALead and copper
  • BLead and antimony
  • CLead and bismuth
  • DLead and zinc
Answer / Hint Save Question Comment On Question
Correct Answer : (B)

Lead and antimony
Explanation:

14.Diamonds are glittering and attractive because light incident on them undergoes

  • AHighest refraction
  • BMultiple internal reflection
  • CMultiple surface reflection
  • DHundred percent transmission
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Correct Answer : (B)

Multiple internal reflection
Explanation:

15.Water can be separated from alcohol water mixture by

  • ADecantation
  • BEvaporation
  • CDistillation
  • DSublimation
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Correct Answer : (C)

Distillation
Explanation:

16.The gas used for filling weather balloons is

  • AHelium
  • BHydrogen
  • CAir
  • DNitrogen
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Correct Answer : (A)

Helium
Explanation:

17.Hydrogen is not found in atmosphere because

  • AIt is highly inflammable
  • BIt is the lightest gas
  • CIt is absorbed by plants
  • DIt immediately combines with oxygen to form water
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Correct Answer : (B)

It is the lightest gas
Explanation:

18.What material is used to make electric heater coil?

  • ACopper
  • BIron
  • CSilver
  • DNichrome
Answer / Hint Save Question
Correct Answer : (D)

Nichrome
Explanation:

19.The major constituent of air is

  • ANitrogen
  • BCarbon dioxide
  • COxygen
  • DHydrogen
Answer / Hint Save Question
Correct Answer : (A)

Nitrogen
Explanation:

20.Rusting of iron takes place due to

  • AOxidation
  • BCarbonation
  • CExfoliation
  • DCorrosion
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Oxidation
Explanation:
4000 Important General Science MCQ Question & Answer in PDF Download

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