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1250 Important Chemistry MCQ Question and Answer PDF

4000 Important General Science MCQ Question & Answer in PDF Download

1.What happens when a chemical bond is formed?

  • AEnergy is always absorbed
  • BEnergy in always released
  • CMore energy is released than is absorbed
  • DEnergy is neither released nor absorbed
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Correct Answer : (A)

Energy is always absorbed
Explanation:

2.?All the four quantum numbers of two electrons in an atom are not the same.? It is the law of ? 

  • AHund?s
  • BExclusion principle of pauli
  • CUncertainty principle of Hiesenberg
  • DAvogadro?s law
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Correct Answer : (B)

Exclusion principle of pauli
Explanation:

3.The atomic number of carbon is 6 and its atomic mass is 12. How many protons are there in the nucleus of carbon?

  • A6
  • B12
  • C18
  • DZero
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Correct Answer : (A)

6
Explanation:

4.The Nucleus of an atom consists of

  • AProton
  • BNeutron
  • CProton and neutron
  • DElectron, proton and neutron
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Correct Answer : (C)

Proton and neutron
Explanation:

5.Isobars are lines joining places having equal

  • ARainfall
  • BPressure
  • CPopulation
  • DHeight above sea level
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Correct Answer : (B)

Pressure
Explanation:

6.What is the element that is in the highest percentage in the composition of the earth?

  • ASilicon
  • BOxygen
  • CMagnesium
  • DIron
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Correct Answer : (B)

Oxygen
Explanation:

7.Milk is a natural

  • ASolution
  • BEmulsion
  • CMixture
  • DSuspension
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Correct Answer : (B)

Emulsion
Explanation:

8.Sea water can be purified by the process of

  • ADistillation
  • BEvaporation
  • CFiltration
  • DFractional distillation
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Correct Answer : (A)

Distillation
Explanation:

9.The residue left after extracting juice from sugar-beet and sugarcane is called

  • AMolasses
  • BBagasse
  • CWhey
  • DBiomass
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Correct Answer : (B)

Bagasse
Explanation:

10.The process of removing calcium and magnesium from hard water is known as

  • ASedimentation
  • BFiltration
  • CFlocculation
  • DWater softening
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Correct Answer : (D)

Water softening
Explanation:

11.The national Chemical Laboratory (India) is located in

  • AMumbai
  • BBangaluru
  • CHyderabad
  • DPune
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Correct Answer : (D)

Pune
Explanation:

12.Which of the following is not a nucleon?

  • AProton
  • BNeutron
  • CElectron
  • DPositron
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Correct Answer : (D)

Positron
Explanation:

13.What particles move around the nucleus of an atom and are negatively charged?

  • AElectrons
  • BProtons
  • CPositrons
  • DNeutrons
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Correct Answer : (A)

Electrons
Explanation:

14.The number of neutrons present in an element having mass number 226 and atomic number 88 is

  • A88
  • B138
  • C314
  • D50
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Correct Answer : (B)

138
Explanation:

15.An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is

  • A17
  • B19
  • C36
  • D53
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Correct Answer : (B)

19
Explanation:

16.Select the one which is not a mixture

  • AAir
  • BGasoline
  • CLPG
  • DDistilled water
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Correct Answer : (D)

Distilled water
Explanation:

17.The total energy of revolving electron in an atom

  • ACannot be negative
  • BCan have any value above zero
  • CCan never be positive
  • DWill always be positive
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Correct Answer : (C)

Can never be positive
Explanation:

18.Conduction band electrons have more mobility than holes because they

  • AAre lighter
  • BExperience collision less frequently
  • CHave negative charge
  • DNeed less energy to move them
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Correct Answer : (B)

Experience collision less frequently
Explanation:

19.The mass number of a nucleus is

  • AAlways less than its atomic number
  • BAlways more than its atomic number
  • CAlways equal to its atomic number
  • DSometimes more and sometimes equal to its atomic number
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Correct Answer : (D)

Sometimes more and sometimes equal to its atomic number
Explanation:

20.The chemical behaviour of an atom depends upon

  • AThe number of protons in its nucleus
  • BThe number of neutrons in its nucleus
  • CThe number of electrons orbiting around the nucleus
  • DThe number of nucleons in the nucleus
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Correct Answer : (C)

The number of electrons orbiting around the nucleus
Explanation:
4000 Important General Science MCQ Question & Answer in PDF Download

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