# NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 13 Nuclei Sample Test,Sample questions

1.mesons

2.photons

3.electrons

4.positrons

## Question: `Alpha particle emitted from a radioactive material are:`

1. Helium nuclei

2.Hydrogen nuclei

3.Lithium nuclei

4.None of the above

## Question: `An alpha particle is emitted from 88Ra226, then the product nuclei has:`

1. Z = 84, A = 224

2. Z = 86, A = 224

3.Z = 86, A = 222

4.Z = 82, A = 222

1. 0.53 MeV

2.1.06 MeV

3.2.12 MeV

4.zero

## Question: `Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of:`

1.electron

2.proton

3.neutron

4.None of the above

1. -13.6 MeV

2.-13.6 eV

3. -13.6 J

4.13.6 J

## Question: `Fusion takes place at high temperature because:`

1.Atom are ionised at high temperature

2.Molecules break up at high temperature

3.Nuclei break up at high temp.

4.Kinetic energy is high enough to overcome repulsion between nuclei

1.92

2.146

3.238

4.0

## Question: `If radio active nuclei emits β-particle, then mass-number:`

1.increased by 1 unit

2.decreases by 1 unit

3. increases by 2 unit

4.decreases by 2 unit

## Question: `Nuclear force is:`

1.strong, short range and charge independent force

2. charge independent, attractive and long range force

3. strong, charge dependent and short range attractive force

4. long range, change dependent and attractive force

## Question: `Rutherford is the unit of:`

2.energy

3.photoelectric current

4.magnetic field

## Question: `The Bohr model of atom:`

1.assumes that the angular momentum of electron is quantized

2. uses Einstein’s photoelectric equation

3. predicts continuous emission spectra for atoms

4. predicts the same emission spectra for all types of atoms

1.1015 kg m-3

2.1018 kg m-3

3.1017 kg m-3

4.1016 kg m-3

1.0 eV

2.-13.6 eV

3.2 eV

4.-27.2 eV

1.0.6930

2. 0.0693

3.10.6930

4.0.3070

1. two protons

2. two electrons

3.two neutrons

4.six nucleons

1. M – Z

2. M

3.Z

4.M + Z

1.234

2.235

3.236

4. 238

## Question: `The phenomena of radioactivity is:`

1. Exothermic change with increase or decrease with temperature

2.increases on applied pressure

3.nuclear process does not depend on external factors

4.None of the above

1. 3.125%

2.6.25%

3..33%

4.31%

## Question: `When the mass of a sample of a radioactive substance decreases, the mean life of the sample:`

1.increases

2.decreases

3.remain unchanged

4.first decreases then increases

1.Becqueral

2. Marie curie

3.Roengton

4.Vanlaw

## More MCQS

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