### MCQs of Nuclei

Showing 1 to 10 out of 138 Questions
1.
 (a) 82, 206, 288 (b) 206, 82, 288 (c) 82, 124, 206 (d) 124, 82, 206
2.
 (a) (b) (c) (d)
3.
 (a) $\frac{27}{64}$ (b) $\frac{3}{4}$ (c) $\frac{9}{16}$ (d) $\frac{13}{30}$
4.
 (a) 11.8 MeV (b) 23.6 MeV (c) 26.9 MeV (d) 32.4 MeV
5.
Which is the necessary and sufficient condition for an element to element to be naturally radioactive?
 (a) Z > 50 (b) Z > 60 (c) Z > 70 (d) Z > 83
6.
 (a) It is maximum for α particle (b) It is maximum for β particle. (c) (d)
7.
During the life time of a radioactive element as time passes the number of its nuclei decrease and along with that_____
 (a) Activity and λ go on decreasing (b) Activity and λ go on increasing (c) Activity decrease but λ remains constant (d) Activity decrease but λ increases
8.
Half-life of an radioactive element is 5 min. At the end of 20 min. Its_____% quantity will remain undisintegrated.
 (a) 93.73 (b) 75 (c) 25 (d) 6.25
9.
After a time interval equal to 3 half-lives; how many times would (a) the activity of a radioactive element be, of its activity? Or (b) mass of a radioactive element be, of its initial mass or (c) number of nuclei of a radioactive element be of its initial number?
 (a) ${2}^{3}$ (b) ${3}^{2}$ (c) $\frac{1}{{3}^{2}}$ (d) $\frac{1}{{2}^{3}}$
10.
 (a) ${}_{83}B{i}^{209}$ (b) ${}_{82}P{b}^{209}$ (c) ${}_{83}B{i}^{214}$ (d) ${}_{82}P{b}^{214}$
Showing 1 to 10 out of 138 Questions