Quiz - physics - Nuclei-PYQ

Q1. Which one of the following pairs of nuclei are isotones? Source: orcusprep.in

NEET 2005

easy

\(_{34}Se^{74}, _{31}Ga^{71}\)

\(_{38}Sr^{84}, _{38}Sr^{86}\)

\(_{42}Mo^{92}, _{40}Zr^{92}\)

\(_{20}Ca^{40}, _{16}S^{32}\)

Q2. A nucleus represented by the symbol \(_{Z}X^{A}\) has Source: orcusprep.in

NEET 2004

easy

Z neutrons and A – Z protons

Z protons and A – Z neutrons

Z protons and A neutrons

A protons and Z – A neutrons

Q3. Atomic weight of Boron is 10.81 and it has two isotopes \(_{5}B^{10}\) and \(_{5}B^{11}\). Then the ratio of \(_{5}B^{10} : _{5}B^{11}\) in nature would be Source: orcusprep.in

NEET 1998

medium

15 : 16

10 : 11

19 : 81

81 : 19

Q4. The constituents of atomic nuclei are believed to be Source: orcusprep.in

NEET 1991

easy

neutrons and protons

protons only

electrons and protons

electrons, protons and neutrons

Q5. In the nucleus of \(_{11}Na^{23}\), the number of protons, neutrons and electrons are Source: orcusprep.in

NEET 1991

easy

11, 12, 0

23, 12, 11

12, 11, 0

23, 11, 12

Q6. The nuclei \(_{6}C^{13}\) and \(_{7}N^{14}\) can be described as Source: orcusprep.in

NEET 1990

easy

isotones

isobars

isotopes of carbon

isotopes of nitrogen

Q7. If the nuclear radius of \(^{27}Al\) is 3.6 fermi, the approximate nuclear radius of \(^{64}Cu\) in fermi is Source: orcusprep.in

NEET 2012

easy

2.4

1.2

4.8

3.6

Q8. Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be Source: orcusprep.in

NEET 2008

easy

\((3)^{1/3} : 1\)

1 : 1

1 : 3

3 : 1

Q9. If the nucleus \(_{13}^{27}Al\) has a nuclear radius of about 3.6 fm, then \(_{52}^{125}Te\) would have its radius approximately as Source: orcusprep.in

NEET 2007

easy

9.6 fm

12.0 fm

4.8 fm

6.0 fm

Q10. The radius of germanium (Ge) nuclide is measured to be twice the radius of \(_{4}^{9}Be\). The number of nucleons in Ge are Source: orcusprep.in

NEET 2006

medium

72

73

74

75

Q11. The volume occupied by an atom is greater than the volume of the nucleus by a factor of about Source: orcusprep.in

NEET 2003

easy

\(10^1\)

\(10^5\)

\(10^{10}\)

\(10^{15}\)

Q12. A nucleus ruptures into two nuclear parts, which have their velocity ratio equal to 2 : 1. What will be the ratio of their nuclear size (nuclear radius)? Source: orcusprep.in

NEET 1996

medium

\(3^{1/2} : 1\)

1 : \(3^{1/2}\)

\(2^{1/3} : 1\)

1 : \(2^{1/3}\)

Q13. The mass number of He is 4 and that of sulphur is 32. The radius of sulphur nucleus is larger than that of helium by the factor of Source: orcusprep.in

NEET 1995

easy

4

2

8

\(8^{1/2}\)

Q14. The mass density of a nucleus varies with mass number A as Source: orcusprep.in

NEET 1992

easy

\(A^2\)

\(A\)

constant

\(1/A\)

Q15. The ratio of the radii of the nuclei \(_{13}Al^{27}\) and \(_{52}Te^{125}\) is approximately Source: orcusprep.in

NEET 1990

easy

6 : 10

13 : 52

40 : 177

14 : 73

Q16. The energy required to break one bond in DNA is \(10^{-20}\) J. This value in eV is nearly Source: orcusprep.in

NEET 2020

easy

6

0.6

0.06

0.006

Q17. The energy equivalent of 0.5 g of a substance is Source: orcusprep.in

NEET 2020

easy

4.5 × 1016 J

4.5 × 1013 J

1.5 × 1013 J

0.5 × 1013 J

Q18. How does the Binding Energy per nucleon vary with the increase in the number of nucleons? Source: orcusprep.in

Karnataka NEET 2013

easy

Decrease continuously with mass number.

First decreases and then increases with increase in mass number.

First increases and then decreases with increase in mass number.

Increases continuously with mass number.

Q19. The mass of a \(_{3}^{7}Li\) nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of \(_{3}^{7}Li\) nucleus is nearly Source: orcusprep.in

NEET 2010

medium

46 MeV

5.6 MeV

3.9 MeV

23 MeV

Q20. If \(M(A; Z), M_p\) and \(M_n\) denote the masses of the nucleus \(_{Z}^{A}X\), proton and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its binding energy in MeV, then Source: orcusprep.in

NEET 2008, 2004

easy

\(M(A, Z) = ZM_p + (A – Z)M_n – BE\)

\(M(A, Z) = ZM_p + (A – Z)M_n + BE/c^2\)

\(M(A, Z) = ZM_p + (A – Z)M_n – BE/c^2\)

\(M(A, Z) = ZM_p + (A – Z)M_n + BE\)

Q21. A nucleus \(_{Z}^{A}X\) has mass represented by M(A, Z). If Mp and Mn denote the mass of proton and neutron respectively and B.E. the binding energy in MeV, then Source: orcusprep.in

NEET 2007

easy

B.E. = [ZMp + (A – Z)Mn – M(A, Z)]\(c^2\)

B.E. = [ZMp + AMn – M(A, Z)]\(c^2\)

B.E. = M(A, Z) – ZMp – (A – Z)Mn

B.E. = [M(A, Z) – ZMp – (A – Z)Mn]\(c^2\)

Q22. Fission of nuclei is possible because the binding energy per nucleon in them Source: orcusprep.in

NEET 2005

medium

increases with mass number at low mass numbers

decreases with mass number at low mass numbers

increases with mass number at high mass numbers

decreases with mass number at high mass numbers.

Q23. The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of \(_{2}^{4}He\) is (Given helium nucleus mass \(\approx 4.0015\) u) Source: orcusprep.in

NEET 2003

medium

0.0305 J

0.0305 erg

28.4 MeV

0.061 u

Q24. Which of the following are suitable for the fusion process? Source: orcusprep.in

NEET 2002

easy

Light nuclei

Heavy nuclei

Element lying in the middle of the periodic table

Middle elements, which are lying on binding energy curve.

Q25. Mn and Mp represent the mass of neutron and proton respectively. An element having mass M has N neutrons and Z protons, then the correct relation will be Source: orcusprep.in

NEET 2001

easy

M < {N · Mn + Z · Mp}

M > {N · Mn + Z · Mp}

M = {N · Mn + Z · Mp}

M = N {Mn + Mp}

Q26. Energy released in nuclear fission is due to Source: orcusprep.in

NEET 2001

medium

some mass is converted into energy

total binding energy of fragments is more than the binding energy of parental element

total binding energy of fragments is less than the binding energy of parental element

total binding energy of fragments is equal to the binding energy of parental element.

Q27. The binding energy per nucleon is maximum in case of Source: orcusprep.in

NEET 1993

easy

\(_{2}^{4}He\)

\(_{26}^{56}Fe\)

\(_{56}^{141}Ba\)

\(_{92}^{235}U\)

Q28. The energy equivalent of one atomic mass unit is Source: orcusprep.in

NEET 1992

easy

1.6 × 10–19 J

6.02 × 1023 J

931 MeV

9.31 MeV

Q29. The average binding energy of a nucleon inside an atomic nucleus is about Source: orcusprep.in

NEET 1989

easy

8 MeV

8 eV

8 J

8 erg

Q30. If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by Fpp, Fnn and Fpn respectively, then Source: orcusprep.in

NEET 1991

easy

\(F_{pp} \approx F_{nn} \approx F_{pn}\)

\(F_{pp} \neq F_{nn} \text{ and } F_{pp} = F_{nn}\)

\(F_{pp} = F_{nn} = F_{pn}\)

\(F_{pp} \neq F_{nn} \neq F_{pn}\)

Q31. Which of the following statements is true for nuclear forces? Source: orcusprep.in

NEET 1990

easy

They obey the inverse square law of distance.

They obey the inverse third power law of distance.

They are short range forces.

They are equal in strength to electromagnetic forces.

Q32. a-particle consists of Source: orcusprep.in

NEET 2019

easy

2 protons only

2 protons and 2 neutrons only

2 electrons, 2 protons and 2 neutrons

2 electrons and 4 protons only

Q33. The rate of radioactive disintegration at an instant for a radioactive sample of half life \(2.2 x 10^9\) s is \(10^{10} s^{-1}\). The number of radioactive atoms in the sample at that instant is, Source: orcusprep.in

Odisha NEET 2019

medium

3.17 × 1020

3.17 × 1017

3.17 × 1018

3.17 × 1019

Q34. For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is Source: orcusprep.in

NEET 2018

easy

20

10

30

15

Q35. Radioactive material ‘A’ has decay constant ‘8 λ’ and material ‘B’ has decay constant ‘λ’. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material ‘B’ to that ‘A’ will be \(1/e\)? Source: orcusprep.in

NEET 2017

medium

\(1/7\lambda\)

\(1/8\lambda\)

\(1/9\lambda\)

\(1/\lambda\)

Q36. The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is Source: orcusprep.in

NEET-II 2016

medium

15

30

45

60

Q37. A nucleus of uranium decays at rest into nuclei of thorium and helium. Then Source: orcusprep.in

NEET 2015

easy

The helium nucleus has more momentum than the thorium nucleus.

The helium nucleus has less kinetic energy than the thorium nucleus.

The helium nucleus has more kinetic energy than the thorium nucleus.

The helium nucleus has less momentum than the thorium nucleus.

Q38. The binding energy per nucleon of \(_{3}^{7}Li\) and \(_{2}^{4}He\) nuclei are 5.60 MeV and 7.06 MeV respectively. In the nuclear reaction \(_{3}^{7}Li + _{1}^{1}H \rightarrow 2 \cdot _{2}^{4}He + Q\) the value of energy Q released is Source: orcusprep.in

NEET 2014

medium

19.6 MeV

–2.4 MeV

8.4 MeV

17.3 MeV

Q39. A radioisotope X with a half life \(1.4 x 10^9\) years decays to Y which is stable. A sample of the rock from a cave was found to contain X and Y in the ratio 1 : 7. The age of the rock is Source: orcusprep.in

NEET 2014

medium

1.96 × 109 years

3.92 × 109 years

4.20 × 109 years

8.40 × 109 years

Q40. The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be Source: orcusprep.in

NEET 2013

easy

80 years

100 years

40 years

60 years

Q41. a-particles, b-particles and g-rays are all having same energy. Their penetrating power in a given medium in increasing order will be Source: orcusprep.in

Karnataka NEET 2013

easy

g, a, b

a, b, g

b, a, g

b, g, a

Q42. A mixture consists of two radioactive materials A1 and A2 with half lives of 20 s and 10 s respectively. Initially the mixture has 40 g of A1 and 160 g of A2. The amount of the two in the mixture will become equal after Source: orcusprep.in

NEET 2012

medium

60 s

80 s

20 s

40 s

Q43. The half life of a radioactive nucleus is 50 days. The time interval (t2 – t1) between the time t2 when 2/3 of it has decayed and the time t1 when 1/3 of it had decayed is Source: orcusprep.in

NEET Mains 2012

easy

30 days

50 days

60 days

15 days

Q44. The half life of a radioactive isotope X is 50 years. It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio of 1 : 15 in a sample of a given rock. The age of the rock was estimated to be Source: orcusprep.in

NEET 2011

easy

150 years

200 years

250 years

100 years

Q45. A radioactive nucleus of mass M emits a photon of frequency \(v\) and the nucleus recoils. The recoil energy will be Source: orcusprep.in

NEET 2011

medium

\(Mc^2 – hv\)

\(h^2v^2/2Mc^2\)

zero

\(hv\)

Q46. A nucleus \(_{m}^{n}X\) emits one \(\alpha\) particle and two \(\beta\)-particles. The resulting nucleus is Source: orcusprep.in

NEET 2011, 1998

medium

\(_{m-6}^{n-4}Z\)

\(_{m-6}^{n}Z\)

\(_{m}^{n-4}X\)

\(_{m-2}^{n-4}Y\)

Q47. Two radioactive nuclei P and Q, in a given sample decay into a stable nucleus R. At time t = 0, number of P species are \(4 N_0\) and that of Q are \(N_0\). Half-life of P (for conversion to R) is 1 minute where as that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of nuclei of R present in the sample would be Source: orcusprep.in

NEET Mains 2011

hard

\(2 N_0\)

\(3 N_0\)

\(9/2 N_0\)

\(5/2 N_0\)

Q48. The activity of a radioactive sample is measured as \(N_0\) counts per minute at t = 0 and \(N_0/e\) counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is Source: orcusprep.in

NEET 2010

medium

\(5/log_e 2\)

\(5\log_e 2\)

5log10 2

5loge 2

Q49. The decay constant of a radio isotope is λ. If A1 and A2 are its activities at times t1 and t2 respectively, the number of nuclei which have decayed during the time (t1 – t2) Source: orcusprep.in

NEET Mains 2010

medium

A1t1 – A2t2

A1 – A2

(A1 – A2)/λ

λ(A1 – A2)

Q50. In the nuclear decay given below
\(_{Z}^{A}X \rightarrow _{Z-1}^{A}Y \rightarrow _{Z-1}^{A}Y^* \rightarrow _{Z-3}^{A-4}B\)
the particles emitted in the sequence are Source: orcusprep.in

NEET 2009, 1993

medium

g, b, a

b, g, a

a, b, g

b, a, g

Q51. The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an Source: orcusprep.in

NEET 2009

medium

isomer of parent

isotone of parent

isotope of parent

isobar of parent

Q52. Two radioactive materials \(X_1\) and \(X_2\) have decay constants \(5\lambda\) and \(\lambda\) respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of \(X_1\) to that \(X_2\) will be \(1/e\) after a time Source: orcusprep.in

NEET 2008

easy

\(1/4\lambda\)

\(e/\lambda\)

\(\lambda\)

\(1/2\lambda\)

Q53. Two radioactive substances A and B have decay constants \(5\lambda\) and \(\lambda\) respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be \((1/e)^2\) after a time interval Source: orcusprep.in

NEET 2007

easy

\(4\lambda\)

\(2\lambda\)

\(1/2\lambda\)

\(1/4\lambda\)

Q54. In a radioactive decay process, the negatively charged emitted \(\beta\)-particles are Source: orcusprep.in

NEET 2007

easy

the electrons produced as a result of the decay of neutrons inside the nucleus

the electrons produced as a result of collisions between atoms

the electrons orbiting around the nucleus

the electrons present inside the nucleus.

Q55. In a radioactive material the activity at time \(t_1\) is \(R_1\) and at a later time \(t_2\), it is \(R_2\). If the decay constant of the material is \(\lambda\), then Source: orcusprep.in

NEET 2006

easy

\(R_1 = R_2\)

\(R_1 = R_2 e^{−\lambda(t_2 - t_1)}\)

\(R_1 = R_2 e^{\lambda(t_2 - t_1)}\)

\(R_1 = R_2(t_2/t_1)\)

Q56. In the reaction \(_{1}^{2}H + _{1}^{3}H \rightarrow _{2}^{4}He + _{0}^{1}n\), if the binding energies of \(_{1}^{2}H, _{1}^{3}H\) and \(_{2}^{4}He\) are respectively a, b and c (in MeV), then the energy (in MeV) released in this reaction is Source: orcusprep.in

NEET 2005

medium

a + b + c

a + b – c

c – a – b

c + a – b

Q57. The half life of radium is about 1600 years. If 100 g of radium existing now, 25 g will remain unchanged after Source: orcusprep.in

NEET 2004

easy

4800 years

6400 years

2400 years

3200 years

Q58. A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element in the sample after two mean lives is Source: orcusprep.in

NEET 2003

medium

1.35 g

2.50 g

3.70 g

6.30 g

Q59. A nuclear reaction given by
\(_{Z}^{A}X \rightarrow _{Z+1}^{A}Y + _{-1}^{0}e + \bar{v}\)
represents Source: orcusprep.in

NEET 2003

easy

\(\beta\)-decay

\(\gamma\)-decay

fusion

fission

Q60. A sample of radioactive element containing \(4 x 10^{16}\) active nuclei. Half life of element is 10 days, then number of decayed nuclei after 30 days Source: orcusprep.in

NEET 2002

easy

\(0.5 x 10^{16}\)

\(2 x 10^{16}\)

\(3.5 x 10^{16}\)

\(1 x 10^{16}\)

Q61. A deutron is bombarded on \(_{8}^{16}O\) nucleus then \(\alpha\)-particle is emitted. The product nucleus is Source: orcusprep.in

NEET 2002

easy

\(_{7}^{13}N\)

\(_{5}^{10}B\)

\(_{4}^{9}Be\)

\(_{7}^{14}N\)

Q62. Which rays contain (positive) charged particles? Source: orcusprep.in

NEET 2001

easy

\(\alpha\)-rays

\(\beta\)-rays

\(\gamma\)-rays

X-rays

Q63. X(n, \(\alpha\)) \(_{3}^{7}Li\), then X will be Source: orcusprep.in

NEET 2001

easy

\(_{5}^{10}B\)

\(_{5}^{9}B\)

\(_{4}^{11}Be\)

\(_{2}^{4}He\)

Q64. Half life of a radioactive element is 12.5 hours and its quantity is 256 g. After how much time its quantity will remain 1 g? Source: orcusprep.in

NEET 2001

easy

50 hrs

100 hrs

150 hrs

200 hrs

Q65. For the given reaction, the particle X is
\(_{6}^{11}C \rightarrow _{5}^{11}B + \beta^+ + X\) Source: orcusprep.in

NEET 2000

easy

neutron

anti neutrino

neutrino

proton

Q66. The relation between \(\lambda\) and \(T_{1/2}\) is Source: orcusprep.in

NEET 2000

easy

\(T_{1/2} = \frac{\ln 2}{\lambda}\)

\(T_{1/2} \ln2 = \lambda\)

\(T_{1/2} = \frac{1}{\lambda}\)

(\(\lambda + T_{1/2}\)) = \(\ln2\)

Q67. Alpha particles are Source: orcusprep.in

NEET 1999

easy

neutrally charged

positron

protons

ionized helium atoms

Q68. After 1\(\alpha\) and 2\(\beta\)-emissions Source: orcusprep.in

NEET 1999

medium

mass number reduces by 6

mass number reduces by 4

mass number reduces by 2

atomic number remains unchanged

Q69. Complete the equation for the following fission process
\(_{92}^{235}U + _{0}^{1}n \rightarrow _{38}^{90}Sr + ...\) Source: orcusprep.in

NEET 1998

medium

\(_{57}^{142}X + 3_{0}^{1}n\)

\(_{54}^{145}X + 3_{0}^{1}n\)

\(_{54}^{143}X + 3_{0}^{1}n\)

\(_{54}^{142}X + 3_{0}^{1}n\)

Q70. Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the samples of A and B have equal number of nuclei. After 80 minutes the ratio of remaining numbers of A and B nuclei is Source: orcusprep.in

NEET 1998

easy

1 : 4

4 : 1

1 : 16

1 : 1

Q71. The most penetrating radiation out of the following are Source: orcusprep.in

NEET 1997

easy

\(\beta\)-rays

\(\gamma\)-rays

X-rays

\(\alpha\)-rays

Q72. What is the respective number of \(\alpha\) and \(\beta\) particles emitted in the following radioactive decay?
\(_{90}^{200}X \rightarrow _{80}^{168}Y\) Source: orcusprep.in

NEET 1995

medium

8 and 8

8 and 6

6 and 8

6 and 6

Q73. The binding energies per nucleon for a deuteron and an \(\alpha\)-particle are \(x_1\) and \(x_2\) respectively. The energy Q released in the reaction \(_{1}^{2}H + _{1}^{2}H \rightarrow _{2}^{4}He + Q\), is Source: orcusprep.in

NEET 1995

medium

\(4(x_1 + x_2)\)

\(4(x_2 - x_1)\)

\(2(x_2 - x_1)\)

\(2(x_1 + x_2)\)

Q74. The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life of 30 minutes decreases to 5 second\(^{-1}\) after 2 hours. The initial count rate was Source: orcusprep.in

NEET 1995

easy

80 second\(^{-1}\)

625 second\(^{-1}\)

20 second\(^{-1}\)

25 second\(^{-1}\)

Q75. The mass of \(\alpha\)-particle is Source: orcusprep.in

NEET 1992

easy

less than the sum of masses of two protons and two neutrons

equal to mass of four protons

equal to mass of four neutrons

equal to sum of masses of two protons and two neutrons

Q76. The half life of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 years Source: orcusprep.in

NEET 1991

easy

1/4

1/2

1/8

1/16

Q77. The nucleus \(_{6}^{12}C\) absorbs an energetic neutron and emits a beta particle (\(\beta\)). The resulting nucleus is Source: orcusprep.in

NEET 1990

medium

\(_{7}^{14}N\)

\(_{7}^{13}N\)

\(_{5}^{13}B\)

\(_{6}^{13}C\)

Q78. A radioactive element has half life period 800 years. After 6400 years what amount will remain? Source: orcusprep.in

NEET 1989

easy

1/2

1/16

1/8

1/256

Q79. An element A decays into element C by a two step processes
A \(\rightarrow\) B + \(_{2}^{4}He\)
B \(\rightarrow\) C + \(2_{-1}^{0}e\)
Then Source: orcusprep.in

NEET 1989

medium

A and C are isotopes

A and C are isobars

A and B are isotopes

A and B are isobars.

Q80. Curie is a unit of Source: orcusprep.in

NEET 1989

easy

energy of gamma rays

half-life

radioactivity

intensity of gamma rays

Q81. A radioactive sample with a half life of 1 month has the label : ‘Activity = 2 micro curies on 1 – 8 – 1991’. What would be its activity two months earlier? Source: orcusprep.in

NEET 1988

medium

1.0 micro curie

0.5 micro curie

4 micro curie

8 micro curie

Q82. The nucleus \(_{48}^{115}Cd\), after two successive \(\beta\)-decay will give Source: orcusprep.in

NEET 1988

easy

\(_{46}^{115}Pa\)

\(_{49}^{114}In\)

\(_{50}^{113}Sn\)

\(_{50}^{115}Sn\)

Q83. When a uranium isotope \(_{92}^{235}U\) is bombarded with a neutron, it generates \(_{36}^{89}Kr\), three neutrons and Source: orcusprep.in

NEET 2020

medium

\(_{56}^{144}Ba\)

\(_{40}^{91}Zr\)

\(_{36}^{101}Kr\)

\(_{36}^{103}Kr\)

Q84. A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is
(given 1 u = 931 MeV) Source: orcusprep.in

NEET 2013

easy

6.675 MeV

13.35 MeV

2.67 MeV

26.7 MeV

Q85. The power obtained in a reactor using \(U^{235}\) disintegration is 1000 kW. The mass decay of \(U^{235}\) per hour is Source: orcusprep.in

NEET 2011

medium

10 microgram

20 microgram

40 microgram

1 microgram

Q86. Fusion reaction takes place at high temperature because Source: orcusprep.in

NEET 2011

easy

nuclei break up at high temperature

atoms get ionised at high temperature

kinetic energy is high enough to overcome the coulomb repulsion between nuclei

molecules break up at high temperature

Q87. The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is Source: orcusprep.in

NEET Mains 2010

medium

23.6 MeV

2.2 MeV

28.0 MeV

30.2 MeV

Q88. The binding energy of deuteron is 2.2 MeV and that of \(_{2}^{4}He\) is 28 MeV. If two deuterons are fused to form one \(_{2}^{4}He\) then the energy released is Source: orcusprep.in

NEET 2006

easy

30.2 MeV

25.8 MeV

23.6 MeV

19.2 MeV

Q89. In any fission process the ratio mass of fission products / mass of parent nucleus is Source: orcusprep.in

NEET 2005

easy

equal to 1

greater than 1

less than 1

depends on the mass of the parent nucleus.

Q90. If in a nuclear fusion process the masses of the fusing nuclei be \(m_1\) and \(m_2\) and the mass of the resultant nucleus be \(m_3\), then Source: orcusprep.in

NEET 2004

easy

\(m_3 = m_1 + m_2\)

\(m_3 = |m_1 - m_2|\)

\(m_3 < (m_1 + m_2)\)

\(m_3 > (m_1 + m_2)\)

Q91. Solar energy is mainly caused due to Source: orcusprep.in

NEET 2003

easy

burning of hydrogen in the oxygen

fission of uranium present in the Sun

fusion of protons during synthesis of heavier elements

gravitational contraction

Q92. Nuclear fission is best explained by Source: orcusprep.in

NEET 2000

medium

liquid droplet theory

Yukawa p-meson theory

independent particle model of the nucleus

proton-proton cycle.

Q93. Which of the following is used as a moderator in nuclear reaction? Source: orcusprep.in

NEET 1997

easy

Cadmium

Plutonium

Uranium

Heavy water

Q94. Energy released in the fission of a single \(_{92}^{235}U\) nucleus is 200 MeV. The fission rate of \(_{92}^{235}U\) filled reactor operating at a power level of 5 W is Source: orcusprep.in

NEET 1993

medium

\(1.56 x 10^{-10}\) s\(^{-1}\)

\(1.56 x 10^{11}\) s\(^{-1}\)

\(1.56 x 10^{-16}\) s\(^{-1}\)

\(1.56 x 10^{-17}\) s\(^{-1}\)

Q95. Solar energy is due to Source: orcusprep.in

NEET 1992

easy

fusion reaction

fission reaction

combustion reaction

chemical reaction

Loading...

Physics - Nuclei-PYQ

Loading...

Physics - Nuclei-PYQ

Image Preview