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Online Tests
ECAT Pre General Science Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers
Question # 1
Radium was discovered by:
Choose an answer
Becquerel
Marie curie
Pierre curie
Rutherford
Both (B) and (C)
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Question # 2
For Protium, the mass defect is:
Choose an answer
Infinite
Zero
Very large
A few grams
None of these
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Question # 3
The half life of uranium-238 is
Choose an answer
6.2 x 10
9
years
4.5 x 10
9
days
4.5 x 10
9
years
1.3 x 10
6
years
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Question # 4
There is present in paraffin a large amount of:
Choose an answer
Nitrogen
Hydrogen
Carbon
Baryllium
Lithium
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Question # 5
Which of the following material has longer half life
Choose an answer
radium
polonium
radium
uranium
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Question # 6
The nucleus/nuclei of hydrogen is/are:
Choose an answer
Proton
Deuteron
Triton
All of these
None of these
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Question # 7
Binding energy per nucleus is
Choose an answer
greater for heavy nucleus
least for heavy nucleus
greatest for light nuclei
decreases for medium weight niclei
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Question # 8
The most abundant isotope of neon is
Choose an answer
neon-20
neon-21
neon-22
neon-23
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Question # 9
1 amu is equal to.
Choose an answer
1.66 x 10
-24
kg
1.66 x 10
-19
kg
1.66 x 10
-24
kg
1.66 x 10
-27
kg
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Question # 10
γ-rays behave like a particle because they explain the
Choose an answer
Compton effect
Photoelectric effect
Pair-production
all the above
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Question # 11
Radioactivity
Choose an answer
is exhibited more by semiconductors in general
in exhibited more by the element when they are coupled
with other radioactive elements by a covalent bond
is an atomic property of radioactive elements
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Question # 12
Charge on proton is
Choose an answer
1.59 x 10
-9
C
1.59 x 10
-7
C
-1.59 x 10
-19
C
1.59 x 10
-19
C
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Question # 13
Mass of neutron is
Choose an answer
1.67 x 10
-31
kg
1.67 x 10
-27
kg
9.1 x 10
-31
kg
1.67 x 10
-
19kg
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Question # 14
The amount of energy equivalent to 1 a.m.u is
Choose an answer
9.315 Mev
93.15 Mev
931.5 Mev
2.22 Mev
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Question # 15
When thorium nucleus emits aβ-particle, the daughter nucleus is called:
Choose an answer
Protactinium
Actinium
Uranium
Radium
Redon
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Question # 16
The number if neutrons in the nucleus of
92
U
235
are
Choose an answer
Infinite
92
235
143
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Question # 17
In his experiment on nuclear reactions, Rutherford bombardedα particles on:
Choose an answer
Nitrogen
Hydrogen
Lead
Oxygen
Krypton
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Question # 18
The nuclei of an element having the same charge number but different mass numbers are called:
Choose an answer
Isobars
Isotopes
Isomers
Isobaric
Isothermal
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Question # 19
During the nuclear changes, the law/s of conservation that hold/s are that of:
Choose an answer
Charge
energy
Momentum
Mass
All of these
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Question # 20
When certain nucleus emits aβ-particles, is mass number:
Choose an answer
Remain same
Increases by one
Decreases by one
Decreases by four
None of these
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Question # 21
Heavy water is made of one oxygen atom and two atoms of:
Choose an answer
Protium
Deuterium
Tritium
Any of these
None of these
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Question # 22
The unit of decay constant is
Choose an answer
sex
sec
2
sec
-1
sec
-2
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Question # 23
Radioactivity is
Choose an answer
self disruptive activity
spontaneous activity
exhibited by all elements under proper conditions
both 'a' and 'b'
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Question # 24
The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called
Choose an answer
nuclear fission
nuclear fusion
man defect
radioactivity
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Question # 25
Marie curie and Pierre curie discovered:
Choose an answer
Uranium
Polonium
Radium
Both (A) and (C)
Plutonium
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Question # 26
If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
Choose an answer
Equal to 1
Less than 1
Greater than 1
Infinity
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Question # 27
Neutron was suggested to be in the nucleus by:
Choose an answer
Rutherford in 1920
Bohar in 1913
Dirac in 1928
Anderson in 1932
None of these
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Question # 28
In radio-active decay, the original element which disintegrate to another element is called
Choose an answer
element
daughter element
parent element
none of these
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Question # 29
The number of all the protons and neutrons in a nucleus is known as
Choose an answer
atomic number
mass number
charge number
none of these
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Question # 30
Beta particles are
Choose an answer
hydrogen nuclei
helium nuclei
electrons
photons
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Question # 31
Curie is a unit of
Choose an answer
reluctance
resistivity
binding energy
radioactivity
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