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1250 Important Chemistry MCQ Question and Answer PDF

4000 Important General Science MCQ Question & Answer in PDF Download

1.Muddy water is treated with alum in purification process, it is termed as

  • AEmulsification
  • BAbsorption
  • CAdsorption
  • DCoagulation
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Correct Answer : (D)

Coagulation
Explanation:

2.Which one of the following is also known as solution?

  • AA compound
  • BA homogeneous mixture
  • CA heterogeneous mixture
  • DA heterogeneous mixture
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Correct Answer : (B)

A homogeneous mixture
Explanation:

3.A solution is

  • AA homogeneous mixture of two or more substances
  • BA solid dissolved in a liquid
  • CA solid dissolved i water
  • DA mixture of two liquids
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Correct Answer : (A)

A homogeneous mixture of two or more substances
Explanation:

4.Which of the following particles has the dual nature of particle wave?

  • AElectron
  • BMeson
  • CProton
  • DNeutron
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Correct Answer : (A)

Electron
Explanation:

5.Atoms having the same number of protons but different number of neutrons are called :

  • AIsotopes
  • BCations
  • CHiggs ? boson
  • DAnions
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Correct Answer : (A)

Isotopes
Explanation:

6.Iron filing can be separated from a heterogeneous mixture using the technique of :

  • ASublimation
  • BMagnetization
  • CSedimentation
  • DEvaporation
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Correct Answer : (B)

Magnetization
Explanation:

7.The strongest oxidizing agent among the following is :

  • AChlorine
  • BIodine
  • CFluorine
  • DOxygen
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Correct Answer : (C)

Fluorine
Explanation:

8.The number of hydrogen bonds between guanine and cytosine in DNA is

  • A2
  • B3
  • C4
  • D1
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Correct Answer : (B)

3
Explanation:

9.J.J. Thomson?s proposed model of action is generally called __________ model.

  • ACream and cake
  • BPlum and pudding
  • CPlum and cake 
  • DCream and pudding
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Correct Answer : (B)

Plum and pudding
Explanation:

10.Atomic number of an atom gives the number of which of the following?

  • AElectrons
  • BProtons
  • CNeutrons
  • DNeutrons and protons
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Correct Answer : (B)

Protons
Explanation:

11.Which one of the following has a maximum tendency to form M3 ion?

  • AN
  • BBi
  • CP
  • DAs
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Correct Answer : (A)

N
Explanation:

12.The molecular mass of a gas is 

  • ATwice its vapour pressure
  • BEqual to its vapour pressure
  • CHalf its vapour pressure
  • DNot related to its vapour pressure
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Correct Answer : (A)

Twice its vapour pressure
Explanation:

13.Chemical properties of isotopes

  • AMust be same
  • BMust be different
  • CNeed not be same
  • DNeed not be different
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Correct Answer : (A)

Must be same
Explanation:

14.Two electrons in an orbital are differentiated by which of the following?

  • AMagnetic quantum number
  • BSpin quantum number
  • CPrincipal quantum number
  • DAzimuthal quantum number
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Correct Answer : (B)

Spin quantum number
Explanation:

15.Isobars have _______ .

  • ASame mass numbers but different atomic numbers
  • BDifferent mass numbers but same atomic numbers
  • CSame mass and atomic numbers
  • DDifferent mass and atomic numbers
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Correct Answer : (A)

Same mass numbers but different atomic numbers
Explanation:

16.Which among the following will be a negative ion?

  • AIf it has more electrons than protons
  • BIf it has more electrons than neutrons
  • CIf it has more electrons than neutrons
  • DIf it has more protons than neutrons
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Correct Answer : (B)

If it has more electrons than neutrons
Explanation:

17.The relation between bond length and bond energy is

  • ALower the bond energy, shorter the bond length
  • BThey are not related
  • CHigher the bond energy, shorter the bond length
  • DHigher the bond energy, longer the bond length
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Correct Answer : (C)

Higher the bond energy, shorter the bond length
Explanation:

18.Electrons in the highest energy level of an atom are called  ________ .

  • AValence protons
  • BOrbital protons
  • CValence electrons
  • DOrbital electrons
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Correct Answer : (C)

Valence electrons
Explanation:

19.What happens when one S and one P orbital are hybridized?

  • AWe get three orbitals in a plane
  • BWe get two orbitals at 180 degrees
  • CWe get two mutually perpendicular orbitals
  • DWe get four orbitals directed tetrahedrally
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Correct Answer : (B)

We get two orbitals at 180 degrees
Explanation:

20.Electrons move around the nucleus in  _________ motion.

  • ATranslator
  • BSpin
  • COrbital
  • DVibrational
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Correct Answer : (C)

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

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