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Online Tests
ECAT Pre General Science Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers
Question # 1
The number if neutrons in the nucleus of
92
U
235
are
Choose an answer
Infinite
92
235
143
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Question # 2
Gamma rays consist of steam of
Choose an answer
electron
proton
photons
all of these
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Question # 3
Rate of decay is actually described by.
Choose an answer
Half line
Decay constant
Mean life
Total life
None of these
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Question # 4
When a nucleus emits an alpha particles, its charge number decreases by
Choose an answer
3
2
6
5
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Question # 5
β-particles are easily deflected by collisions than heavy
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α-particles
β-particles
γ-particles
none of these
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Question # 6
The distance travelled by
α-particle in a medium before coming to rest, is called
Choose an answer
range of
γ-particle
range of neutrons
range of particle
none of these
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Question # 7
When thorium nucleus emits aβ-particle, the daughter nucleus is called:
Choose an answer
Protactinium
Actinium
Uranium
Radium
Redon
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Question # 8
The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
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3 more neutrons
3 more electrons
3 more protons
3 more ions
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Question # 9
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 # 10
The energy is found from Einstein's mass energy relation is called
Choose an answer
binding energy of electron
binding energy of proton
binding energy of neutron
binding energy of nucleus
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Question # 11
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 # 12
Nucleon means:
Choose an answer
Only electrons
Only neutrons
Only protons
Both (A ) and (C)
Both (B) and (C)
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Question # 13
The rate of decay of a radioactive substance
Choose an answer
decrease exponentially with time
decreases linearly with time
increases linearly with time
increases exponentially with time
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Question # 14
Neutron was discovered by
Choose an answer
Curie
Roentgen
Chadwick
Rutherford
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Question # 15
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 # 16
Nucleus consists of
Choose an answer
proton and neutron
protons and electron
electron and neutron
protons only
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Question # 17
Charge on neutron is
Choose an answer
1.6 x 10
-19
C
zero
-1.6 x 10
-19
C
1.2 x 10
-19
C
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Question # 18
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 # 19
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 # 20
A particle having the mass of electron and charge of a proton is called a
Choose an answer
photon
position
antiproton
antineutrino
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Question # 21
According to Rutherford atomic model, the positive charge in an atom
Choose an answer
is concentrated at its centre
is in the form of positive electron at same distance from its centre
is spread uniformly through its volume
none of these
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Question # 22
The range of
β-particle in air is greater than that of
α-particle by
Choose an answer
1000 times
100 times
15 times
10 times
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Question # 23
The chemical properties of all the isotopes of an elements are
Choose an answer
same
different
slightly different
none of these
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Question # 24
Neutrons are
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positive charge
negatively charged
massless
neutral
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Question # 25
A curie represents a very strong source of
Choose an answer
α-particle
β-particle
γ-particle
none of these
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Question # 26
The number of protons inside a nucleus is called
Choose an answer
mass number
atomic weight
atomic number
none of these
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Question # 27
Neutron was disvovered by:
Choose an answer
Rutherford in 1920
Chadwick in 1922
Bohr in 1913
Compton in 1927
None of these
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Question # 28
1 amu is equal to
Choose an answer
1.66 x 10
-24
kg
1.66 x 10
-19
kg
1.66 x 10
-34
kg
1.66 x 10
-27
kg
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Question # 29
Radioactivity was discovered by
Choose an answer
Rutherford
Henri Becqureal
Maxwell
James Chadwick
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Question # 30
Radiation detector are used to
Choose an answer
measure intensity of radiation
measure energy of radiation
difference between different types of radiation
all the above
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Question # 31
Pair production take place when energy of
γ-rays photon is
Choose an answer
equal to 1.02 Mev-
greater than 1.02 Mev
less than 1.02 Mev
none of these
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