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) 16O8
(b) 12C6
(c) 1H1
(d) 35Cl17
The correct answers to the above question in:
Answer: (b)
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Question : 1
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 : 2
Which one of the following is not needed in a nuclear fission reactor?
a) Accelerator
b) Coolant
c) Moderator
d) Control device
Answer »Answer: (a)
Question : 3
Which of the following isotopes is used as the standard for atomic mass ?
a) 16O
b) 13C
c) 12C
d) 1H
Answer »Answer: (c)
Question : 4
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 : 5
Which of the following is not a subatomic particle?
a) Proton
b) Deuteron
c) Neutron
d) Electron
Answer »Answer: (b)
Question : 6
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)
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