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1250 Important Chemistry MCQ Question and Answer PDF

4000 Important General Science MCQ Question & Answer in PDF Download

1.Where does the oxygen that keeps us alive come from?

  • ACarbon dioxide
  • BCarbonates absorbed from soil
  • COxides of minerals
  • DWater
Answer / Hint Save Question
Correct Answer : (D)

Water
Explanation:

2.The three element most needed in common fertilisers are

  • ASulphur, phosphorous and sodium
  • BNitrogen, Potassium and phosphorous
  • CPhosphorous, sodium and nitrogen
  • DCalcium, phosphorous and Potassium
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Correct Answer : (B)

Nitrogen, Potassium and phosphorous
Explanation:

3.Which of the following metals pollutes the air of a city having large number of automobiles?

  • ACadmium
  • BChromium
  • CLead
  • DCopper
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Correct Answer : (C)

Lead
Explanation:

4.The substance which does not expand on going from liquid state to solid state is

  • AWater 
  • BCast-iron
  • CAluminium
  • DType metal
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Correct Answer : (D)

Type metal
Explanation:

5.Which of the following is used as a lubricant in heavy machines?

  • ABauxite
  • BSulphur
  • CPhosphorus
  • DGraphite 
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Correct Answer : (D)

Graphite 
Explanation:

6.The anode in a dry cell is made up of

  • ACopper
  • BZinc
  • CCadmium
  • DGraphite
Answer / Hint Save Question Comment On Question
Correct Answer : (B)

Zinc
Explanation:

7.Galvanization is the :

  • ADeposition of zinc on iron
  • BDeposition of tin on iron
  • CDeposition of copper on iron
  • DDeposition of aluminium on iron
Answer / Hint Save Question
Correct Answer : (A)

Deposition of zinc on iron
Explanation:

8.What is the most commonly used substance in fluorescent tubes?

  • ASodium oxide and argon
  • BSodium vapour and neon
  • CMercury vapour and argon
  • DMercury oxide and neon
Answer / Hint Save Question Comment On Question
Correct Answer : (C)

Mercury vapour and argon
Explanation:

9.Which one of the following metals is used to galvanise iron?

  • ACopper
  • BZinc
  • CMercury
  • DLead
Answer / Hint Save Question
Correct Answer : (C)

Mercury
Explanation:

10.Which of the following is not a precious/semi-precious stone?

  • ASapphire
  • BRuby
  • CPearl
  • DEmerald
Answer / Hint Save Question
Correct Answer : (C)

Pearl
Explanation:

11.Which among the following metals provides amphoteric oxide?

  • ASodium
  • BSilver
  • CAluminium
  • DCalcium
Answer / Hint Save Question
Correct Answer : (C)

Aluminium
Explanation:

12.Humburger effect is otherwise known as

  • ASodium pump
  • BAnaerobic metabolism
  • CCholoride shift
  • DRespiratory product
Answer / Hint Save Question
Correct Answer : (C)

Choloride shift
Explanation:

13.Which among the following elements is found in maximum percentage in the human body?

  • ACarbon
  • BHydrogen
  • CNitrogen
  • DOxygen
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Oxygen
Explanation:

14.Which among the following is pure matter?

  • Acarbon-dioxide
  • Bbrass
  • Cair
  • Diron
Answer / Hint Save Question
Correct Answer : (A)

carbon-dioxide
Explanation:

15.Which among the following coal contains 90 percent of carbon?

  • AAnthracite
  • BBitumen
  • CLignite
  • DPeat
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Correct Answer : (A)

Anthracite
Explanation:

16.The metal does not give H2 on treatment with dilute HCL is

  • AZn
  • BFe
  • CAg
  • DCa
Answer / Hint Save Question Comment On Question
Correct Answer : (C)

Ag
Explanation:

17.Quartz is made of

  • ACalcium Sulphate
  • BCalcium Silicate
  • CSodium Sulphate
  • DSodium Silicate
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Sodium Silicate
Explanation:

18.Which of the following is ozone depleting pesticide?

  • AD.D.T.
  • BBenzene
  • CMethyl bromide
  • DEthylene ozonide
Answer / Hint Save Question Comment On Question
Correct Answer : (C)

Methyl bromide
Explanation:

19.The molecule which has the highest percentage of ionic character among the following is

  • AHI
  • BHF
  • CHCI
  • DHBr
Answer / Hint Save Question
Correct Answer : (B)

HF
Explanation:

20.Global warming is mainly due to accumulation of 

  • AOxides of nitrogen
  • BOxides of sulphur 
  • CCarbon dioxide
  • DCarbon monoxide
Answer / Hint Save Question Comment On Question
Correct Answer : (C)

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

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