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) next to outermost orbit
(b) first orbit
(c) outermost orbit
(d) any one of its orbit
The correct answers to the above question in:
Answer: (c)
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Question : 1
The alpha particle carries two positive charges. Its mass is very nearly equal to that of
a) An atom of helium
b) Sum of masses of two positrons and two neutrons
c) Two protons
d) Two positrons are each positron carries a single positive charge
Answer »Answer: (a)
Question : 2
While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation ?
a) Carbon dioxide is present in air
b) Air is a poor conductor of electricity under normal conditions
c) Dust particles are present in air
d) None of these
Answer »Answer: (b)
Question : 3
Which one of the following laws explains the formation of carbon monoxide and carbon dioxide from carbon and oxygen?
a) Law of multiple proportions
b) Law of reciprocal proportions
c) Law of conservation of mass
d) Law of difinite proportions
Answer »Answer: (a)
Law of multiple proportions explains the formation of CO and CO2 , in these same weight of carbon that combines with weights of oxygen are in simple rate of 1 : 2.
Question : 4
Radioactivity was discovered by
a) Becquerel
b) Bohr
c) Rutherford
d) Madam Curie
Answer »Answer: (a)
Question : 5
Which one among the following is correct regarding 20Ne, 23Na+, 19F– and 24Mg2+?
a) They are isoelectronic with each other
b) They are isotopes of each other
c) They are isomers of each other
d) All of the above
Answer »Answer: (a)
Question : 6
The Nucleus of Helium has
a) Two protons
b) Two protons and two neutrons
c) Only one neutron
d) One proton and two neutrons
Answer »Answer: (b)
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