set 3 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on atomic structure, molecules and nuclear chemistry topic of general science mcq
(a) Proton
(b) Deuteron
(c) Neutron
(d) Electron
The correct answers to the above question in:
Answer: (b)
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Read more chemistry basic Based General Science Questions and Answers
Question : 1
In an atom, the order of filling up of the orbitals is governed by
a) Heisenberg’s uncertainty principle
b) Hund’s rule
c) Aufbau’s principle
d) Pauli’s exclusion principle
Answer »Answer: (c)
Question : 2
The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard?
a) 16O8
b) 12C6
c) 1H1
d) 35Cl17
Answer »Answer: (b)
Question : 3
Which of the following describes an isotope with a mass number of 99 that contains 56 neutrons in its nucleus ?
a) $↖43↙56{Ba}$
b) $↖99↙43{Tc}$
c) $↖99↙56{Ba}$
d) $↖56↙43{Tc}$
Answer »Answer: (b)
Given mass number (Z) = 99
No. of neutrons = 56
∴ No. of protons = atomic number = 99 – 56 = 43
i.e., $↖56↙43{Tc}$
Question : 4
What is the number of water molecules present in a tiny drop of water ( volume 0.0018 ml ) at room temperature?
a) 6.023 × 1019
b) 4.184 × 1018
c) 4.84 × 1017
d) 6.023 × 1023
Answer »Answer: (a)
Question : 5
One gram of which of the following contains largest number of oxygen atoms?
a) O2
b) O3
c) O
d) All contains same
Answer »Answer: (b)
The no. of atoms in O3 is maximum i.e., 3
Question : 6
Protons and neutrons are bound in a nucleus by the
a) long range ‘electromagnetic interaction’
b) short range ‘strong interaction’
c) short range ‘weak interaction’
d) long range ‘gravitational interaction’
Answer »Answer: (b)
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