nuclear chemistry questions
Answers
heya,
Who was the first person to win two Nobel Prizes? ...
Who was the first person to win two Nobel Prizes? ...Beta radiation is the. ...
Who was the first person to win two Nobel Prizes? ...Beta radiation is the. ...The atomic number decreases by two during what type of radiation? ...
Who was the first person to win two Nobel Prizes? ...Beta radiation is the. ...The atomic number decreases by two during what type of radiation? ...X-rays are an example of what type of radiation? ...
Who was the first person to win two Nobel Prizes? ...Beta radiation is the. ...The atomic number decreases by two during what type of radiation? ...X-rays are an example of what type of radiation? ...The atomic number increases by one during what type of radioactive decay?
Answer:
Isotones are elements having
Same atomic number but different neutrons
B
Different atomic and mass number but same neutrons
C
Same mass number but different neutrons
D
Same atomic number, mass number and neutrons
Question 2
Gamma rays are
A
High energy protons
B
High energy electrons
C
Low energy electrons
D
High energy electromagnetic waves
Question 3
Isotopes were discovered by
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A
Soddy
B
Thomson
C
Aston
D
Millikan
Question 4
Nucleons are
A
Electrons and neutrons
B
Protons and electrons
C
Protons and neutrons
D
Electrons, protons and neutrons
Question 5
In a radioactive decay, an emitted electron comes from
A
Orbit having principal quantum number one
B
Nucleus of the atom
C
Outermost orbit of the atom
D
Inner orbital of the atom
Question 6
Starting from radium, the radioactive disintegration process terminates when the following is obtained
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A
Radon
B
Radium A
C
Lead
D
Radium B
Question 7
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
V B
D
III B
Question 8
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
25 gm
B
40 gm
C
2.5 gm
D
60 gm
Question 9
Half-life for radioactive C14 is 5760 years. In how many years 200 mg of C14 sample will be reduced to 25 mg
A
17280 years
B
11520 years
C
5760 years
D
23040 years
Question 10
The amount of energy, which is required to separate the nucleons from a nucleus. The energy is called
A
Lattice energy
B
Binding energy
C
Kinetic energy
D
None of these
Question 11
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
24 hours
B
6 hours
C
128 hours
D
12 hours
Question 12
Meson was discovered
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A
Einstein
B
Moseley
C
Austin
D
Yukawa
Question 13
Radioactive disintegration differs from a chemical change in being
A
A unimolecular first order reaction
B
A spontaneous process
C
An exothermic change
D
A nuclear process
Question 14
If 3/4 quantity of a radioactive element disintegrates in two hours, its half-life would be
A
30 minutes
B
15 minutes
C
1 hour
D
45 minutes
Question 15
Neutron is used as a
A
Reducing agent
B
Tracer
C
Moderator
D
In biological programme
Question 16
If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be
A
2 and 1
B
3 and 1
C
1 and 1
D
1 and 3
Question 17
Fusion bomb involves
A
Combustion of oxygen
B
Combination of lighter nuclei into bigger nucleus
C
Explosion of TNT
D
Destruction of heavy nucleus into smaller nuclei
Question 18
Which particle can be used to change 13Al27 into 15P30
A
Neutron
B
alpha-particle
C
Deuteron
D
Proton
Question 19
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
5 hr
C
80 hr
D
20 hr
Question 20
Which of the following does not characterise X-rays?
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A
Have wavelengths shorter than ultraviolet rays
B
The radiation can ionise gases
C
It causes ZnS to fluorescence
D
Deflected by electric and magnetic field
Question 21
Isotopes are atoms having the same
A
Number of neutrons
B
Atomic mass
C
Mass number
D
Atomic number
Question 22
An isotope of oxygen has mass number 18. Other isotopes of oxygen will have the same
A
Mass number
B
Atomic weight
C
Number of protons
D
Number of neutrons
Question 23
Radioactivity is due to
A
Unstable nucleus
B
Stable nucleus
C
Unstable electronic configuration
D
Stable electronic configuration
Question 24
Nuclear theory of the atom was put forward by
A
J.J. Thomson
B
Aston
C
Neils Bohr
D
Rutherford
Question 25
Which element is the end product of each natural radioactive series?
A
Bi
B
Sn
C
Pb
D
C
Question 26
Large energy released in an atomic bomb explosion is mainly due to
A
Conversion of heavier to lighter atoms
B
Release of neutrons
C
Release of electrons
D
Products having a lesser mass than initial substance
Question 27
Formation of nucleus from its nucleons is accompanied by
A
None of them
B
No change of mass
C
Increase in mass
D
Decrease in mass
Question 28
Which of the following is radioactive element?
A
Polonium
B
Tellurium
C
Sulphur
D
Selenium
Question 29
Which of the following properties are different for neutral atoms of isotopes of the same element?
A
Mass
B
Atomic number
C
Number of electrons
D
General chemical reactions
Explanation:
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