CBSE Class 12 Physics Nuclei Notes Set A

Nuclei MCQ Questions with Answers Class 12 Physics 

Question- The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus.This implies that helium

(a) can easily be broken up

(b) is very stable

(c) can be used as fissionable meterial

(d) is radioactive

Answer-(b)

Question- Chadwick was awarded the 1935 nobel prize in physics for his discovery of the

(a) electron

(b) proton

(c) neutron

(d) positron

Answer-(c)

Question- The nuclear radius is of the order of

(a) 10^–10 m

(b) 10^–6 m

(c) 10^–15 m

(d) 10^–14 m

Answer-(d)

Question- Particles which can be added to the nucleus of an atom without changing its chemical properties are called

(a) neutrons

(b) electrons

(c) protons

(d) alpha particles

Answer-(a)

Question- In ...X... water is circulated though the reactor vessel and transfers energy to steam generator in the ...Y... Here, X and Y refer to

(a) primary loop, secondary loop

(b) reactor core, turbine

(c) secondary loop, primary loop

(d) turbine, reactor core

Answer-(a)

Question- Nuclear forces are

(a) spin dependent and have no non-central part

(b) spin dependent and have a non-central part

(c) spin independent and have no non-central part

(d) spin independent and have a non-central part

Answer-(b)

Question- Which one of the following has the identical property for isotopes?

(a) Physical property

(b) Chemical property

(c) Nuclear property

(d) Thermal property

Answer-(b)

Question- The number of protons in an atom of atomic number Z and mass number A is

(a) zero

(b) Z

(c) A – Z

(d) A

Answer-(b)

Question- Mass energy equation was propounded by

(a) Newton

(b) Madam Curie

(c) C. V. Raman

(d) Einstein

Answer-(d)

Question- The mass of an atomic nucleus is less than the sum of the masses of its constituents. This mass defect is converted into

(a) heat energy

(b) light energy

(c) electrical energy

(d) energy which binds nucleons together

Answer-(d)

Question- Which of the following statement is not true regarding Einsteins mass energy relation?

(a) Mass disappears to reappear as energy.

(b) Energy disappears to reappear as mass.

(c) Mass and energy are two different forms of the same entity.

(d) Mass and energy can never be related to each other.

Answer-(d)

Question- A nuclei having same number of neutron but different number of protons / atomic number are called

(a) isobars

(b) isomers

(c) isotones

(d) isotopes

Answer-(c)

Question- The radius of a nucleus is

(a) directly proportional to its mass number

(b) inversely proportional to its atomic weight

(c) directly proportional to the cube root of its mass number

(d) None of these

Answer-(c)

Question- Nuclear forces exists between

(a) neutron - neutron

(b) proton - proton

(c) neutron - proton

(d) all of these

Answer-(d)

Question- The element gold has

(a) 16 isotopes

(b) 32 isotopes

(c) 96 isotopes

(d) 173 isotopes

Answer-(b)

Question- When the number of nucleons in nuclei increases, the binding energy per nucleon

(a) increases continuously with mass number

(b) decreases continuously with mass number

(c) remains constant with mass number

(d) first increases and then decreases with increase of mass number

Answer-(d)

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