MCQs of Nuclei

Showing 71 to 80 out of 138 Questions

71.

If the half - life of a radioactive element is τ_{\frac{1}{2}}, then what would be the amount of its sample remaining, compared to the original amount after time equal to \frac{τ_{\frac{1}{2}}}{2} ?

72.

If in the fission of {}_{92}^{235}U, 0.1 % of its mass gets converted into energy, what would be the energy produced in the fission of 1 kg {}_{92}^{235}U ?

73.

What is indicated from the following by the mass defect of a nucleus ?

(a)	Error in the measurement of nucleon's masses
(b)	The mass is destroyed for producing the required energy for nuclear binding.
(c)	Difference between the masses of neutrons and protons of the nucleus.
(d)	The difference in the mass number and atomic number for that nucleus.

74.

{}_{10}^{20}{Ne} absorbs energy and then disintegrates into 2 α - particles and an unknown nucleus . What would be that unknown nucleus ?

75.

Which of the following alternative should be selected to slow the fast neutrons ?

(a)	To keep lead envelope.
(b)	To pass them through water.
(c)	To pass them through a magnetic field.
(d)	To pass them through an electric field.

76.

Which are the isotope, isotone and isobar nuclei respectively of {}_{6}^{12}C from among {}_{6}^{14}C, {}_{5}^{12}B and {}_{7}^{13}N ?

77.

If the radii of {}_{13}^{27}{Al} and {}_{30}^{64}{Zn} nuclei are R_{1} and R_{2} respectively, then \frac{R_{1}}{R_{2}} =_____.

78.

The binding energy per nucleon for deuteron ({}_{1}^{2}H) nucleus 1.1 MeV and that for {}_{2}^{4}{He} nucleus is 7 MeV . If two deuteron nuclei fuse to form {}_{2}^{4}{He} nucleus, how many energy will be produced ?

79.

Which is the necessary and sufficient condition for an element to be naturally radioactive ?

80.

Which one of the following is true for the relative ionizing power of α, β, γ ?

Showing 71 to 80 out of 138 Questions