Engineering Entrance Sample Papers

Nuclear Chemistry Quiz

nuclear chemistry practice questions and answers

Nuclear Chemistry Practice Questions and Answers:

Nuclear Chemistry Important Questions

Question 1
Formation of nucleus from its nucleons is accompanied by
A
None of them
B
No change of mass
C
Decrease in mass
D
Increase in mass
Question 2
Which of the following properties are different for neutral atoms of isotopes of the same element?
A
Atomic number
B
Mass
C
General chemical reactions
D
Number of electrons
Question 3
If 2.0 g of a radioactive isotope has a half-life of 20 hr, the half-life of 0.5 g of the same substance is
A
10 hr
B
80 hr
C
5 hr
D
20 hr
Question 4
Nuclear theory of the atom was put forward by
A
Aston
B
Neils Bohr
C
J.J. Thomson
D
Rutherford
Question 5
Meson was discovered

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A
Moseley
B
Austin
C
Einstein
D
Yukawa
Question 6
92U235 belongs to group III B of periodic table. If it loses one alpha-particle, the new element will belong to group
A
I A
B
I B
C
III B
D
V B
Question 7
Gamma rays are
A
High energy electrons
B
Low energy electrons
C
High energy electromagnetic waves
D
High energy protons
Question 8
Nucleons are
A
Protons and neutrons
B
Protons and electrons
C
Electrons and neutrons
D
Electrons, protons and neutrons
Question 9
Radioactivity is due to
A
Unstable nucleus
B
Stable nucleus
C
Stable electronic configuration
D
Unstable electronic configuration
Question 10
If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be
A
3 and 1
B
1 and 1
C
1 and 3
D
2 and 1
Question 11
Half-life for radioactive C14 is 5760 years. In how many years 200 mg of C14 sample will be reduced to 25 mg
A
11520 years
B
17280 years
C
23040 years
D
5760 years
Question 12
If 3/4 quantity of a radioactive element disintegrates in two hours, its half-life would be
A
45 minutes
B
15 minutes
C
30 minutes
D
1 hour
Question 13
Which of the following does not characterise X-rays?

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A
It causes ZnS to fluorescence
B
Have wavelengths shorter than ultraviolet rays
C
The radiation can ionise gases
D
Deflected by electric and magnetic field
Question 14
Which of the following is radioactive element?
A
Polonium
B
Selenium
C
Tellurium
D
Sulphur
Question 15
Fusion bomb involves
A
Explosion of TNT
B
Combustion of oxygen
C
Combination of lighter nuclei into bigger nucleus
D
Destruction of heavy nucleus into smaller nuclei
Question 16
Which element is the end product of each natural radioactive series?
A
Sn
B
Pb
C
Bi
D
C
Question 17
Radioactive disintegration differs from a chemical change in being
A
A nuclear process
B
A spontaneous process
C
A unimolecular first order reaction
D
An exothermic change
Question 18
Neutron is used as a
A
Reducing agent
B
In biological programme
C
Tracer
D
Moderator
Question 19
Isotopes are atoms having the same
A
Atomic mass
B
Number of neutrons
C
Mass number
D
Atomic number
Question 20
A radioactive isotope has a half-life of 20 days. If 100 gm of the substance is taken, the weight of the isotope remaining after 40 days is

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A
2.5 gm
B
25 gm
C
60 gm
D
40 gm
Question 21
An isotope of oxygen has mass number 18. Other isotopes of oxygen will have the same
A
Mass number
B
Number of neutrons
C
Number of protons
D
Atomic weight
Question 22
Isotones are elements having
A
Same mass number but different neutrons
B
Different atomic and mass number but same neutrons
C
Same atomic number, mass number and neutrons
D
Same atomic number but different neutrons
Question 23
Large energy released in an atomic bomb explosion is mainly due to
A
Release of neutrons
B
Release of electrons
C
Conversion of heavier to lighter atoms
D
Products having a lesser mass than initial substance
Question 24
The amount of energy, which is required to separate the nucleons from a nucleus. The energy is called
A
Lattice energy
B
Kinetic energy
C
Binding energy
D
None of these
Question 25
Starting from radium, the radioactive disintegration process terminates when the following is obtained

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A
Lead
B
Radium B
C
Radon
D
Radium A
Question 26
A freshly prepared radioactive source of half-life 2 hours emits radiations of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is
A
128 hours
B
24 hours
C
6 hours
D
12 hours
Question 27
Isotopes were discovered by

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A
Aston
B
Thomson
C
Millikan
D
Soddy
Question 28
In a radioactive decay, an emitted electron comes from
A
Orbit having principal quantum number one
B
Nucleus of the atom
C
Inner orbital of the atom
D
Outermost orbit of the atom
Question 29
Which particle can be used to change 13Al27 into 15P30
A
Neutron
B
Deuteron
C
Proton
D
alpha-particle
There are 29 questions to complete.
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