KCET SERIES Physics
Nuclei
21 previous year questions.
Volume: 21 Ques
Yield: High
High-Yield Trend
1
2025 1
2020 1
2019 1
2018 1
2017 1
2015 3
2013 1
2012 2
2011 2
2010 2
2008 2
2007 3
1999 Chapter Questions 21 MCQs
01
PYQ 1999
medium
physics ID: kcet-199
Mass of a photon of frequency v is given by
1
2
3
4
02
PYQ 1999
medium
physics ID: kcet-199
Mean life of a radioactive element is one year. Then its half life is (in year)
1
0.5
2
0.8
3
1
4
0.693
03
PYQ 1999
medium
physics ID: kcet-199
The number of atoms in a radioactive sample reduces from 1000 to 100 in two days. Then the number of atoms remaining at the end of four days is
1
25
2
20
3
10
4
50
04
PYQ 2007
medium
physics ID: kcet-200
The volume of a nucleus is directly proportional to .........
1
2
3
4
05
PYQ 2007
medium
physics ID: kcet-200
A radioactive substance contains nuclei and its half life period is days. The number of nuclei present at the end of days is
1
7500
2
8000
3
9000
4
7070
06
PYQ 2008
easy
physics ID: kcet-200
undergoes successive disintegrations with the end product of .The number of and particles emitted are
1
2
3
4
07
PYQ 2008
medium
physics ID: kcet-200
On bombarding by slow neutron, energy is released. If the power output of atomic reactor is , then the rate of fission will be
1
2
3
4
08
PYQ 2010
medium
physics ID: kcet-201
Pick out the correct statement from the following:
1
is not suitable for a fission reaction.
2
For stable nucleus, the specific binding energy is low.
3
Energy released per unit mass of the reactant is less in case of fusion reaction.
4
Packing fraction may be positive or may be negative
09
PYQ 2010
medium
physics ID: kcet-201
When a neutron is disintegrated to give -particle, ............
1
a proton alone is emitted
2
a proton and an antineutrino are emitted
3
a neutrino alone is emitted
4
a proton and neutrino are emitted
10
PYQ 2011
easy
physics ID: kcet-201
1 curie represents
1
disintegrations per second
2
disintegrations per second
3
disintegrations per second
4
disintegration per second
11
PYQ 2011
medium
physics ID: kcet-201
The thermonuclear reaction of hydrogen inside the stars is taking place by a cycle of operations. The particular element which acts as a catalyst is
1
nitrogen
2
oxygen
3
helium
4
Carbon
12
PYQ 2012
medium
physics ID: kcet-201
Mass numbers of the elements and are and respectively. The specific binding energy of them are and respectively. Then, in which of the following reaction/s energy is released ? (a) (b) (c)
1
only in (a)
2
in (b), (c)
3
in (a), (c)
4
in (a), (b) and (c)
13
PYQ 2013
medium
physics ID: kcet-201
Pick out the correct statements from the following: (I) Electron emission during -decay is always accompained by neutrino (II) Nuclear force is charge independent. (III) Fusion is the chief source of stellar energy
1
(I) , (II) are correct
2
(I) , (III) are correct
3
only (I) is correct
4
(II), (III) are correct
14
PYQ 2013
medium
physics ID: kcet-201
and are the two radioactive elements. The mixture of these elements show a total activity of disintegrations/minute. The half life of is day and that of is days.What will be the total activity after days ? Given : The initial number of atoms in and are equal.
1
200 dis/min
2
250 dis/min
3
500 dis/min
4
150 dis/min
15
PYQ 2013
medium
physics ID: kcet-201
A radioactive substance emits beta particles in the first seconds and beta particles in the next seconds. The mean life of the sample is
1
seconds
2
seconds
3
seconds
4
seconds
16
PYQ 2015
medium
physics ID: kcet-201
A nucleus at rest splits into two nuclear parts having radii in the ratio 1:2. Their velocities are in the ratio
1
8:1
2
6:1
3
4:1
4
2:1
17
PYQ 2017
medium
physics ID: kcet-201
In a nuclear reactor the function of the Moderator is to decrease
1
number of neutrons
2
speed of neutrons
3
escape of neutrons
4
temperature of the reactor
18
PYQ 2018
medium
physics ID: kcet-201
The energy equivalent to a substance of mass 1 g is
1
2
3
4
19
PYQ 2019
easy
physics ID: kcet-201
Which one of the following nuclei has shorter mean life?
1
C
2
A
3
Same for all
4
B
20
PYQ 2020
medium
physics ID: kcet-202
A radio-active elements has half-life of years. What is the fraction that will decay in years?
1
0.25
2
0.5
3
0.75
4
0.85
21
PYQ 2025
medium
physics ID: kcet-202
If the radius of the first Bohr orbit is , then the radius of the second Bohr orbit will be
1
2
3
4
About Nuclei - KCET
Nuclei is a vital chapter for KCET aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Nuclei PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Nuclei carry the most weight. Then, tackle the questions iteratively to solidify your understanding.