Nuclei Practice Questions - DPP for NEET

 Page 1


DIRECTIONS (Q.1-Q.21) : There are 21 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 The energy released per fission of uranium 235 is about
200 MeV . A reactor using U-235 as fuel is producing 1000
kilowatt power. The number of U-235 nuclei undergoing
fission per sec is, approximately-
(a) 10
6
(b) 2 × 10
8
(c) 3 × 10
16
(d) 931
Q.2 Power output of 
92
U
235
 reactor if it takes 30 days to use up
2kg of fuel, and if each fission gives 185 MeV of useable
energy is-
(a) 5.846 kW (b) 58.46 MW
(c) .5846 kW (d) None
Q.3 How many electrons, protons and neutrons are there in a
6 gm of 
6
C
12
.
(a) 6 × 10
23
, 6 × 10
23
 , 6 × 10
23
(b) 36 × 10
23 
, 36 × 10
23
 , 36 × 10
23
(c) 12 × 10
23
, 12 × 10
23
, 12 × 10
23
(d) 18 × 10
23
, 18 × 10
23
, 18 × 10
23
Q.4 Nuclear radius of 
8
O
16
 is 3 × 10
–15
 m. Find the density of
nuclear matter.
(a) 7.5 × 10
17
 kg m
–3
(b) 5.7 × 10
17
 kg m
–3
(c) 2.3 × 10
17
 kg m
–3
(d) 1.66 × 10
17
 kg m
–3
Q.5 Consider the decay of radium-226 atom into an alpha
particle and radon-222. Then, what is the mass defect of the
reaction-
Mass of radium -226 atom = 226.0256 u
Mass of radon - 222 atom = 222.0715 u
Mass of helium - 4 atom = 4.0026 u
(a) 0.0053 u (b) 0.0083 u
(c) 0.083 u (d) None
Page 2


DIRECTIONS (Q.1-Q.21) : There are 21 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 The energy released per fission of uranium 235 is about
200 MeV . A reactor using U-235 as fuel is producing 1000
kilowatt power. The number of U-235 nuclei undergoing
fission per sec is, approximately-
(a) 10
6
(b) 2 × 10
8
(c) 3 × 10
16
(d) 931
Q.2 Power output of 
92
U
235
 reactor if it takes 30 days to use up
2kg of fuel, and if each fission gives 185 MeV of useable
energy is-
(a) 5.846 kW (b) 58.46 MW
(c) .5846 kW (d) None
Q.3 How many electrons, protons and neutrons are there in a
6 gm of 
6
C
12
.
(a) 6 × 10
23
, 6 × 10
23
 , 6 × 10
23
(b) 36 × 10
23 
, 36 × 10
23
 , 36 × 10
23
(c) 12 × 10
23
, 12 × 10
23
, 12 × 10
23
(d) 18 × 10
23
, 18 × 10
23
, 18 × 10
23
Q.4 Nuclear radius of 
8
O
16
 is 3 × 10
–15
 m. Find the density of
nuclear matter.
(a) 7.5 × 10
17
 kg m
–3
(b) 5.7 × 10
17
 kg m
–3
(c) 2.3 × 10
17
 kg m
–3
(d) 1.66 × 10
17
 kg m
–3
Q.5 Consider the decay of radium-226 atom into an alpha
particle and radon-222. Then, what is the mass defect of the
reaction-
Mass of radium -226 atom = 226.0256 u
Mass of radon - 222 atom = 222.0715 u
Mass of helium - 4 atom = 4.0026 u
(a) 0.0053 u (b) 0.0083 u
(c) 0.083 u (d) None
2
DPP/ P 56
Q.6 If mass equivalent to one mass of proton is completely
converted into energy then determine the energy produced?
(a) 931.49 MeV (b) 731.49 MeV
(c) 911.49 MeV (d) 431.49 MeV
Q.7 If mass equivalent to one mass of electron is completely
converted into energy then determine the energy liberated.
(a) 1.51 MeV (b) 0.51 MeV
(c) 3.12 MeV (d) 2.12 MeV
Q.8 If  the mass  defect in the formation of helium from
hydrogen is 0.5%, then the energy obtained,  in kWH, in
forming helium from 1 kg of hydrogen will be-
(a) 1.25 (b) 125 × 10
4
(c) 1.25 × 10
8
(d) 1.25 × 10
6
Q.9 The half life of radioactive Radon is 3.8 days. The time at
the end of which 1/20
th
 of the Radon sample will remain
undecayed is
(Given log 
10
e = 0.4343)
(a) 3.8 days (b) 16.5 days
(c) 33 days (d) 76 days
Q.10 In the nuclear reaction,
92
U
238
 ® 
Z
Th
A
 + 
2
He
4
, the values of A and Z are-
(a) A = 234, Z = 94 (b) A = 234, Z = 90
(c) A = 238, Z = 94 (d) A = 238, Z = 90
Q.11 The mass of helium nucleus is less than that of its
constituent particles by 0.03 a.m.u. The binding energy per
nucleon of 
2
He
4
 nucleus will be-
(a) 7 MeV (b) 14 MeV
(c) 3.5 MeV (d) 21 MeV
Q.12 If the binding energy of deuterium is 2.23 MeV, then the
mass defect will be- (in a.m.u.)
(a) 0.0024 (b) – 0.0024
(c) – 0.0012 (d) 0.0012
Q.13 The ratio of the radii of the nuclei 
27
13
Al and 
52
Tee
125
 is
approximately -
(a) 6 : 10 (b) 13 : 52
(c) 40 : 177 (d) 14 : 73
Q.14 The radius of the 
30
Zn
64
 nucleus is nearly (in fm)-
(a) 1.2 (b) 2.4
(c) 3.7 (d) 4.8
Q.15 How many electrons, protons, and neutrons are there in a
nucleus of atomic number 11 and  mass number 24?
(a) 11, 12, 13 (b) 11, 11, 13
(c) 12, 11, 13 (d) 11, 13, 12
Q.16Energy of each photon obtained in the pair production
process will be, if the mass of electron or positron is
1/2000 a.m.u-
(a) 0.213 MeV (b) 0.123 MeV
(c) 0.321 MeV (d) 0.465 MeV
Q.17Deuterium is an isotope of hydrogen having a mass of
2.01470 amu. Find binding energy  in MeV of this isotope
(a) 2.741 MeV (b) 2.174 MeV
(c) 1.741 MeV (d) 0.741 MeV
Q.18 The binding energy per nucleon for 
3
Li
7
 will be, if the mass
of 
3
Li
7
  is 7.0163 a.m.u.
(a) 5.6 MeV (b) 39.25 MeV
(c) 1 MeV (d) zero
Page 3


DIRECTIONS (Q.1-Q.21) : There are 21 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 The energy released per fission of uranium 235 is about
200 MeV . A reactor using U-235 as fuel is producing 1000
kilowatt power. The number of U-235 nuclei undergoing
fission per sec is, approximately-
(a) 10
6
(b) 2 × 10
8
(c) 3 × 10
16
(d) 931
Q.2 Power output of 
92
U
235
 reactor if it takes 30 days to use up
2kg of fuel, and if each fission gives 185 MeV of useable
energy is-
(a) 5.846 kW (b) 58.46 MW
(c) .5846 kW (d) None
Q.3 How many electrons, protons and neutrons are there in a
6 gm of 
6
C
12
.
(a) 6 × 10
23
, 6 × 10
23
 , 6 × 10
23
(b) 36 × 10
23 
, 36 × 10
23
 , 36 × 10
23
(c) 12 × 10
23
, 12 × 10
23
, 12 × 10
23
(d) 18 × 10
23
, 18 × 10
23
, 18 × 10
23
Q.4 Nuclear radius of 
8
O
16
 is 3 × 10
–15
 m. Find the density of
nuclear matter.
(a) 7.5 × 10
17
 kg m
–3
(b) 5.7 × 10
17
 kg m
–3
(c) 2.3 × 10
17
 kg m
–3
(d) 1.66 × 10
17
 kg m
–3
Q.5 Consider the decay of radium-226 atom into an alpha
particle and radon-222. Then, what is the mass defect of the
reaction-
Mass of radium -226 atom = 226.0256 u
Mass of radon - 222 atom = 222.0715 u
Mass of helium - 4 atom = 4.0026 u
(a) 0.0053 u (b) 0.0083 u
(c) 0.083 u (d) None
2
DPP/ P 56
Q.6 If mass equivalent to one mass of proton is completely
converted into energy then determine the energy produced?
(a) 931.49 MeV (b) 731.49 MeV
(c) 911.49 MeV (d) 431.49 MeV
Q.7 If mass equivalent to one mass of electron is completely
converted into energy then determine the energy liberated.
(a) 1.51 MeV (b) 0.51 MeV
(c) 3.12 MeV (d) 2.12 MeV
Q.8 If  the mass  defect in the formation of helium from
hydrogen is 0.5%, then the energy obtained,  in kWH, in
forming helium from 1 kg of hydrogen will be-
(a) 1.25 (b) 125 × 10
4
(c) 1.25 × 10
8
(d) 1.25 × 10
6
Q.9 The half life of radioactive Radon is 3.8 days. The time at
the end of which 1/20
th
 of the Radon sample will remain
undecayed is
(Given log 
10
e = 0.4343)
(a) 3.8 days (b) 16.5 days
(c) 33 days (d) 76 days
Q.10 In the nuclear reaction,
92
U
238
 ® 
Z
Th
A
 + 
2
He
4
, the values of A and Z are-
(a) A = 234, Z = 94 (b) A = 234, Z = 90
(c) A = 238, Z = 94 (d) A = 238, Z = 90
Q.11 The mass of helium nucleus is less than that of its
constituent particles by 0.03 a.m.u. The binding energy per
nucleon of 
2
He
4
 nucleus will be-
(a) 7 MeV (b) 14 MeV
(c) 3.5 MeV (d) 21 MeV
Q.12 If the binding energy of deuterium is 2.23 MeV, then the
mass defect will be- (in a.m.u.)
(a) 0.0024 (b) – 0.0024
(c) – 0.0012 (d) 0.0012
Q.13 The ratio of the radii of the nuclei 
27
13
Al and 
52
Tee
125
 is
approximately -
(a) 6 : 10 (b) 13 : 52
(c) 40 : 177 (d) 14 : 73
Q.14 The radius of the 
30
Zn
64
 nucleus is nearly (in fm)-
(a) 1.2 (b) 2.4
(c) 3.7 (d) 4.8
Q.15 How many electrons, protons, and neutrons are there in a
nucleus of atomic number 11 and  mass number 24?
(a) 11, 12, 13 (b) 11, 11, 13
(c) 12, 11, 13 (d) 11, 13, 12
Q.16Energy of each photon obtained in the pair production
process will be, if the mass of electron or positron is
1/2000 a.m.u-
(a) 0.213 MeV (b) 0.123 MeV
(c) 0.321 MeV (d) 0.465 MeV
Q.17Deuterium is an isotope of hydrogen having a mass of
2.01470 amu. Find binding energy  in MeV of this isotope
(a) 2.741 MeV (b) 2.174 MeV
(c) 1.741 MeV (d) 0.741 MeV
Q.18 The binding energy per nucleon for 
3
Li
7
 will be, if the mass
of 
3
Li
7
  is 7.0163 a.m.u.
(a) 5.6 MeV (b) 39.25 MeV
(c) 1 MeV (d) zero
DPP/ P 56
3
Q.19Sun radiates energy in all direction. The average energy
recieved at earth is 1.4 kW/m
2
. The average distance
between the earth and the sun is 1.5 × 10
11
 m. If this energy
is released by conservation of mass into energy, then the
mass lost per day by the sun is approximately
(Use 1day = 86400 sec)
(a) 4.4 × 10
9
 kg (b) 7.6 × 10
14
 kg
(c) 3.8 × 10
12
 kg (d) 3.8 × 10
14
 kg
Q.20Fission of nuclei is possible because the binding energy
per nucleon in them
(a) increases with mass number at high mass number
(b) decreases with mass number at high mass number
(c) increases with mass number at low mass numbers
(d) decreases with mass number at low mass numbers
Q.21 Half life of Bi
210
 is 5 days. If we start with 50,000 atoms
of this isotope, the number of atoms left over after 10 days
is
(a) 5,000 (b) 25,000
(c) 12,500 (d) 20,000
DIRECTIONS (Q.22-Q.24) : In the following questions,
more than one of the answers  given are correct. Select the
correct answers and mark it according to the following
codes:
Codes :
(a) 1, 2 and 3 are correct (b) 1 and 2 are correct
(c) 2 and 4 are correct (d) 1 and 3 are correct
Q.22 On disintegration of one atom of U
235
 the amount of energy
obtained is 200 MeV. The power obtained in a reactor is
1000 KW. Then
(1) atoms disintegrated per second in reactor is
3.125 ×10
16
(2) atoms disintegrated per second in reactor is
3.125 ×10
18
(3) decay in mass per hour is 4 × 10
–8
 kg
(4) decay in mass per hour is 4 × 10
–6
 kg
Q.23 Which of the following are not examples of nuclear fusion?
(1) Formation of Ba and Kr from U
235
(2) Formation of Pu – 235 from U
–235
(3) Formation of water from hydrogen and oxygen
(4) Formation of He from H
Q.24Which of the following are mode of radioactive decay?
(1) Positron emission (2) Electron capture
(3) Alpha decay (4) Fusion
DIRECTIONS (Q.25-Q.27) : Read the passage given below
and answer the questions that follows :
In a living organism, the quantity of C
14
 is the same as in the
atmosphere. But in organisms which are dead, no exchange takes
place with the atmosphere and by measuring the decay rate of
14
C in the old bones or wood, the time taken for the activity to
reduce to this level can be calculated. This gives the age of the
wood or bone.
Given : T
1/2
 for 
14
C is 5370 years and the ratio of
14
C/
12
C is 1.3 × 10
–12
.
Q.25 The decay rate of 
14
C in 1g of carbon in a living organism
is
(a) 25 Bq (b) 2.5 Bq
(c) 0.25 Bq (d) 5 Bq
Page 4


DIRECTIONS (Q.1-Q.21) : There are 21 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 The energy released per fission of uranium 235 is about
200 MeV . A reactor using U-235 as fuel is producing 1000
kilowatt power. The number of U-235 nuclei undergoing
fission per sec is, approximately-
(a) 10
6
(b) 2 × 10
8
(c) 3 × 10
16
(d) 931
Q.2 Power output of 
92
U
235
 reactor if it takes 30 days to use up
2kg of fuel, and if each fission gives 185 MeV of useable
energy is-
(a) 5.846 kW (b) 58.46 MW
(c) .5846 kW (d) None
Q.3 How many electrons, protons and neutrons are there in a
6 gm of 
6
C
12
.
(a) 6 × 10
23
, 6 × 10
23
 , 6 × 10
23
(b) 36 × 10
23 
, 36 × 10
23
 , 36 × 10
23
(c) 12 × 10
23
, 12 × 10
23
, 12 × 10
23
(d) 18 × 10
23
, 18 × 10
23
, 18 × 10
23
Q.4 Nuclear radius of 
8
O
16
 is 3 × 10
–15
 m. Find the density of
nuclear matter.
(a) 7.5 × 10
17
 kg m
–3
(b) 5.7 × 10
17
 kg m
–3
(c) 2.3 × 10
17
 kg m
–3
(d) 1.66 × 10
17
 kg m
–3
Q.5 Consider the decay of radium-226 atom into an alpha
particle and radon-222. Then, what is the mass defect of the
reaction-
Mass of radium -226 atom = 226.0256 u
Mass of radon - 222 atom = 222.0715 u
Mass of helium - 4 atom = 4.0026 u
(a) 0.0053 u (b) 0.0083 u
(c) 0.083 u (d) None
2
DPP/ P 56
Q.6 If mass equivalent to one mass of proton is completely
converted into energy then determine the energy produced?
(a) 931.49 MeV (b) 731.49 MeV
(c) 911.49 MeV (d) 431.49 MeV
Q.7 If mass equivalent to one mass of electron is completely
converted into energy then determine the energy liberated.
(a) 1.51 MeV (b) 0.51 MeV
(c) 3.12 MeV (d) 2.12 MeV
Q.8 If  the mass  defect in the formation of helium from
hydrogen is 0.5%, then the energy obtained,  in kWH, in
forming helium from 1 kg of hydrogen will be-
(a) 1.25 (b) 125 × 10
4
(c) 1.25 × 10
8
(d) 1.25 × 10
6
Q.9 The half life of radioactive Radon is 3.8 days. The time at
the end of which 1/20
th
 of the Radon sample will remain
undecayed is
(Given log 
10
e = 0.4343)
(a) 3.8 days (b) 16.5 days
(c) 33 days (d) 76 days
Q.10 In the nuclear reaction,
92
U
238
 ® 
Z
Th
A
 + 
2
He
4
, the values of A and Z are-
(a) A = 234, Z = 94 (b) A = 234, Z = 90
(c) A = 238, Z = 94 (d) A = 238, Z = 90
Q.11 The mass of helium nucleus is less than that of its
constituent particles by 0.03 a.m.u. The binding energy per
nucleon of 
2
He
4
 nucleus will be-
(a) 7 MeV (b) 14 MeV
(c) 3.5 MeV (d) 21 MeV
Q.12 If the binding energy of deuterium is 2.23 MeV, then the
mass defect will be- (in a.m.u.)
(a) 0.0024 (b) – 0.0024
(c) – 0.0012 (d) 0.0012
Q.13 The ratio of the radii of the nuclei 
27
13
Al and 
52
Tee
125
 is
approximately -
(a) 6 : 10 (b) 13 : 52
(c) 40 : 177 (d) 14 : 73
Q.14 The radius of the 
30
Zn
64
 nucleus is nearly (in fm)-
(a) 1.2 (b) 2.4
(c) 3.7 (d) 4.8
Q.15 How many electrons, protons, and neutrons are there in a
nucleus of atomic number 11 and  mass number 24?
(a) 11, 12, 13 (b) 11, 11, 13
(c) 12, 11, 13 (d) 11, 13, 12
Q.16Energy of each photon obtained in the pair production
process will be, if the mass of electron or positron is
1/2000 a.m.u-
(a) 0.213 MeV (b) 0.123 MeV
(c) 0.321 MeV (d) 0.465 MeV
Q.17Deuterium is an isotope of hydrogen having a mass of
2.01470 amu. Find binding energy  in MeV of this isotope
(a) 2.741 MeV (b) 2.174 MeV
(c) 1.741 MeV (d) 0.741 MeV
Q.18 The binding energy per nucleon for 
3
Li
7
 will be, if the mass
of 
3
Li
7
  is 7.0163 a.m.u.
(a) 5.6 MeV (b) 39.25 MeV
(c) 1 MeV (d) zero
DPP/ P 56
3
Q.19Sun radiates energy in all direction. The average energy
recieved at earth is 1.4 kW/m
2
. The average distance
between the earth and the sun is 1.5 × 10
11
 m. If this energy
is released by conservation of mass into energy, then the
mass lost per day by the sun is approximately
(Use 1day = 86400 sec)
(a) 4.4 × 10
9
 kg (b) 7.6 × 10
14
 kg
(c) 3.8 × 10
12
 kg (d) 3.8 × 10
14
 kg
Q.20Fission of nuclei is possible because the binding energy
per nucleon in them
(a) increases with mass number at high mass number
(b) decreases with mass number at high mass number
(c) increases with mass number at low mass numbers
(d) decreases with mass number at low mass numbers
Q.21 Half life of Bi
210
 is 5 days. If we start with 50,000 atoms
of this isotope, the number of atoms left over after 10 days
is
(a) 5,000 (b) 25,000
(c) 12,500 (d) 20,000
DIRECTIONS (Q.22-Q.24) : In the following questions,
more than one of the answers  given are correct. Select the
correct answers and mark it according to the following
codes:
Codes :
(a) 1, 2 and 3 are correct (b) 1 and 2 are correct
(c) 2 and 4 are correct (d) 1 and 3 are correct
Q.22 On disintegration of one atom of U
235
 the amount of energy
obtained is 200 MeV. The power obtained in a reactor is
1000 KW. Then
(1) atoms disintegrated per second in reactor is
3.125 ×10
16
(2) atoms disintegrated per second in reactor is
3.125 ×10
18
(3) decay in mass per hour is 4 × 10
–8
 kg
(4) decay in mass per hour is 4 × 10
–6
 kg
Q.23 Which of the following are not examples of nuclear fusion?
(1) Formation of Ba and Kr from U
235
(2) Formation of Pu – 235 from U
–235
(3) Formation of water from hydrogen and oxygen
(4) Formation of He from H
Q.24Which of the following are mode of radioactive decay?
(1) Positron emission (2) Electron capture
(3) Alpha decay (4) Fusion
DIRECTIONS (Q.25-Q.27) : Read the passage given below
and answer the questions that follows :
In a living organism, the quantity of C
14
 is the same as in the
atmosphere. But in organisms which are dead, no exchange takes
place with the atmosphere and by measuring the decay rate of
14
C in the old bones or wood, the time taken for the activity to
reduce to this level can be calculated. This gives the age of the
wood or bone.
Given : T
1/2
 for 
14
C is 5370 years and the ratio of
14
C/
12
C is 1.3 × 10
–12
.
Q.25 The decay rate of 
14
C in 1g of carbon in a living organism
is
(a) 25 Bq (b) 2.5 Bq
(c) 0.25 Bq (d) 5 Bq
4
DPP/ P 56
Q.26If in an old sample of wood of 10g the decay rate is 30
decays per minute, the age of the wood is
(a) 50 years (b) 1000 years
(c) 13310 years (d) 15300 years
Q.27 The decay rate in another piece is found to be 0.30 Bq per
gm then we can conclude
(a) the sample is very recent
(b) the observed decay is not that of 
14
C alone
(c) there is a statistical error
(d) all of these
DIRECTIONS (Q. 28-Q.30) : Each of these questions contains
two statements: Statement-1 (Assertion) and Statement-2
(Reason). Each of these questions has four alternative choices,
only one of which is the correct answer. You have to select the
correct choice.
(a) Statement-1 is True, Statement-2 is True; Statement-2 is a
correct explanation for  Statement-1.
(b) Statement-1 is True, Statement-2 is True; Statement-2 is
NOT a correct explanation for Statement-1.
(c) Statement -1 is False, Statement-2 is True.
(d) Statement -1 is True, Statement-2 is False.
Q.28 Statement-1 : Amongst alpha, beta and gamma rays, g-has
maximum penetrating power.
Statement-2 : The alpha particle is heavier than beta and
gamma rays.
Q.29 Statement-1 : The mass of b-particles when they are
emitted is higher than the mass of electrons obtained by
other means.
Statement-2 : b-particle and electron, both are similar
particles.
Q.30Statement-1 : Electron capture occurs more often than
positron emission in heavy elements.
Statement-2 : Heavy elements exhibit radioactivity.