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1250 Important Chemistry MCQ Question and Answer PDF

4000 Important General Science MCQ Question & Answer in PDF Download

1.Brass is an alloy of

  • ALead and tin
  • BZinc and copper
  • CAntimony, tin and lead
  • DZinc, tin and copper
Answer / Hint Save Question
Correct Answer : (B)

Zinc and copper
Explanation:

2.Which one of the following pairs is NOT correctly matched?

  • AHaematite : Copper
  • BBauxite : Aluminium
  • CMonazite : Thorium
  • DPitch blende : Uranium
Answer / Hint Save Question
Correct Answer : (A)

Haematite : Copper
Explanation:

3.The charcoal used to decolourise brown sugar solution is

  • AWood charcoal
  • BCoconut charcoal
  • CAnimal charcoal
  • DSugar charcoal
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Correct Answer : (C)

Animal charcoal
Explanation:

4.Which one of the following is used for dating very old objects of archaeological importance?

  • APhosphorus ? 31
  • BTritium
  • CRadium
  • DCarbon ? 14
Answer / Hint Save Question
Correct Answer : (D)

Carbon ? 14
Explanation:

5.Chemically "Quick Silver" is known as

  • AMercury
  • BSilver
  • CGold
  • DCopper
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Mercury
Explanation:

6.Which of the following gases is mixed with oxygen for breathing by divers in aqualungs?

  • AMethane
  • BNitrogen
  • CHelium
  • DHydrogen
Answer / Hint Save Question
Correct Answer : (B)

Nitrogen
Explanation:

7.Among the following which is always found in free-state in nature?

  • AGold
  • BSilver
  • CSodium
  • DCopper
Answer / Hint Save Question
Correct Answer : (A)

Gold
Explanation:

8.The hardest form of carbon is

  • ADiamond
  • BGraphite
  • CCoke
  • DLamp black
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Diamond
Explanation:

9.Which metal does not undergo corrosion due to the formation of oxide layer?

  • ACopper
  • BIron
  • CAluminium
  • DZinc
Answer / Hint Save Question Comment On Question
Correct Answer : (C)

Aluminium
Explanation:

10.Solder is an alloy of

  • ALead, zinc
  • BCopper, lead
  • CTin, lead
  • DSodium, lead
Answer / Hint Save Question
Correct Answer : (C)

Tin, lead
Explanation:

11.Name two elements that find wide application in transistor industry

  • ASilicon and Germanium
  • BCarbon and Platinum
  • CIridium and Germanium
  • DTungsten and Platinum
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Silicon and Germanium
Explanation:

12.An inert gas mixed with oxygen given to patients suffering from restricted breathing is

  • AHelium
  • BKrypton
  • CRadon
  • DArgon
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Helium
Explanation:

13.An example of major air pollutant is

  • AOxygen
  • BCarbon monoxide
  • CHelium
  • DCarbon dioxide
Answer / Hint Save Question Comment On Question
Correct Answer : (B)

Carbon monoxide
Explanation:

14.Among the following the hardest metal is

  • AGold
  • BIron
  • CPlatinum
  • DTungsten
Answer / Hint Save Question
Correct Answer : (D)

Tungsten
Explanation:

15.The element used for making solar cells is

  • ATin
  • BSilicon
  • CCaesium
  • DThallium
Answer / Hint Save Question Comment On Question
Correct Answer : (B)

Silicon
Explanation:

16.Which one of the following elements is least likely to be found in commercial fertilisers?

  • ANitrogen
  • BPhosphorous
  • CPotassium
  • DSilicon
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Silicon
Explanation:

17.The wire of flash bulb is made of

  • ACopper
  • BBarium
  • CMagnesium
  • DSilver
Answer / Hint Save Question Comment On Question
Correct Answer : (C)

Magnesium
Explanation:

18.Xenon

  • AXenon
  • BArgon
  • CHelium
  • DNeon
Answer / Hint Save Question
Correct Answer : (D)

Neon
Explanation:

19.What is the most common salt in sea water?

  • ACalcium carbonate
  • BPotassium chloride
  • CSodium chloride
  • DMagnesium sulphate
Answer / Hint Save Question Comment On Question
Correct Answer : (C)

Sodium chloride
Explanation:

20.Which one of the following is a renewable source of energy?

  • ACoal
  • BGeothermal power
  • CNatural gas
  • DUranium
Answer / Hint Save Question Comment On Question
Correct Answer : (B)

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

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