Nuclei  MCQs

MCQs of Nuclei

Showing 101 to 110 out of 138 Questions
8 9 10 11 12 13
101.
What is mass of α-particle ?
(a) 4mp
(b) 4mn
(c) 2mp + 2mn
(d) 2me + 2mp where mp, mn and me are the mass of proton, neutron and electron respectively.
Answer:

Option (c)

102.
To release a nucleon from nucleus where the mass defect per nucleon is more, then _____ energy must be given to free nucleon from it.
(a) energy equal to binding energy
(b) energy less than binding energy
(c) energy greater than binding energy
(d) zero
Answer:

Option (a)

103.
Gamma rays are made up of _____ .
(a) electrons
(b) protons
(c) photons
(d) positrons
Answer:

Option (c)

104.
The unit of radioactive is _____ .
(a) Curie
(b) Rutherford
(c) Henry
(d) Both (A) and (B)
Answer:

Option (d)

105.
When a neutron is disintegrated _____ emission are produced.
(a) a proton, and neutron and gamma
(b) a proton, p a β+ and γ
(c) a proton, β¯ and v¯ (antineutrino)
(d) a proton, one β+ and v (neutrino)
Answer:

Option (c)

106.
In which of the following quantity, the law of conservation is valid for a nuclear reaction ?
(a) energy
(b) charge
(c) mass
(d) all of these
Answer:

Option (d)

107.
Natural radioactivity is a ______ phenomenon.
(a) nuclear
(b) atomic
(c) chemical
(d) physical
Answer:

Option (a)

108.
Which scientist discovered natural radioactivity ?
(a) Becquerel
(b) Rontzen
(c) Madam Curie
(d) Rutherford
Answer:

Option (a)

109.
Decay constant of a radioactive element λ = 1 unit then its half life is _____ .
(a) zero
(b) 1 unit
(c) log 2 unit
(d) 0.693 unit
Answer:

Option (d)

110.
The half life time of Pb is _____ .
(a) zero
(b) infinite
(c) 1590 days
(d) 1590 years
Answer:

Option (b)

Showing 101 to 110 out of 138 Questions
8 9 10 11 12 13