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NCERT Solutions for class 12 Physics | Chapter 13 - Nuclei

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Free download in PDF Class 12 Physics Chapter 13 Nuclei Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(1) Radius of 1st Bohr orbit is a0 (= 0.529 Å) What is the radius of 2nd Bohr orbit?
[A] 10-8
[B] 2a0
[C] 4a0
[D] 2√2a0
Answer: 4a0
(2) The Bohr model of atom:
[A] assumes that the angular momentum of electron is quantized
[B] uses Einstein’s photoelectric equation
[C] predicts continuous emission spectra for atoms
[D] predicts the same emission spectra for all types of atoms
Answer: assumes that the angular momentum of electron is quantized

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(3) The wavelength of y-rays is of the order of:
[A] 10-8 m
[B] 10-5 m
[C] 10-11 m
[D] 10-22 m
Answer: 10-11 m
(4) Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of:
[A] electron
[B] proton
[C] neutron
[D] None of these
Answer: neutron
(5) Nuclear force is:
[A] strong, short range and charge independent force
[B] charge independent, attractive and long range force
[C] strong, charge dependent and short range attractive force
[D] long range, change dependent and attractive force
Answer: strong, short range and charge independent force
(6) Fusion takes place at high temperature because:
[A] Atom are ionised at high temperature
[B] Molecules break up at high temperature
[C] Nuclei break up at high temp.
[D] Kinetic energy is high enough to overcome repulsion between nuclei
Answer: Kinetic energy is high enough to overcome repulsion between nuclei
(7) The ground state energy of Hydrogen atom is -13.6 eV. What is the potential energy of electron in this state?
[A] 0 eV
[B] -13.6 eV
[C] 2 eV
[D] -27.2 eV
Answer: -27.2 eV
(8) The density of a nucleus is of the order of:
[A] 1015 kg m-3
[B] 1018 kg m-3
[C] 1017 kg m-3
[D] 1016 kg m-3
Answer: 1017 kg m-3
(9) If radio active nuclei emits β-particle, then mass-number:
[A] increased by 1 unit
[B] decreases by 1 unit
[C] increases by 2 unit
[D] decreases by 2 unit
Answer: increased by 1 unit
(10) The half life of a radioactive decay is n times its mean life, n is equal to:
[A] 0.6930
[B] 0.0693
[C] 1/0.6930
[D] 0.3070
Answer: 0.6930
(11) An alpha particle is emitted from 88Ra226, then the product nuclei has:
[A] Z = 84, A = 224
[B] Z = 86, A = 224
[C] Z = 86, A = 222
[D] Z = 82, A = 222
Answer: Z = 86, A = 222
(12) What percentage of radioactive substance is left after 5 half lives?
[A] 3.125%
[B] 6.25%
[C] 12.33%
[D] 31%
Answer: 3.125%
(13) K radioactive radiations are emitted in the sequence
[A] α, β, γ
[B] β, α, γ
[C] γ, α, β
[D] β, γ, α
Answer: β, α, γ
(14) X-ray was discovered by :
[A] Becqueral
[B] Marie curie
[C] Roengton
[D] Vanlaw
Answer: Roengton
(15) The more readily fissionable isotope of uranium has an atomic mass of:
[A] 234
[B] 235
[C] 236
[D] 238
Answer: 235
(16) The phenomena of radioactivity is:
[A] Exothermic change with increase or decrease with temperature
[B] increases on applied pressure
[C] nuclear process does not depend on external factors
[D] None of these
Answer: nuclear process does not depend on external factors
(17) When one gm of mass is converted into energy, it is equal to:
[A] 103 kWh
[B] 109 kWh
[C] 1010 kWh
[D] 1011 kWh
Answer: 103 kWh
(18) The mass no. of a nucleus is M and its atomic no. is Z. The number of neutrons in the nucleus is :
[A] M – Z
[B] M
[C] Z
[D] M + Z
Answer: M – Z
(19) How many electrons are contained in U nucleus?
[A] 92
[B] 146
[C] 238
[D] 0
Answer: 0
(20) The order of nuclear density is :
[A] 103
[B] 1017
[C] 106
[D] None
Answer: 1017

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