Download App

Chemistry MCQ

Nuclear Chemistry and Radioactivity · Maharashtra Board STD 11 Science (MSBSHSE - English Medium). 15 questions.

Questions

MCQ

Take a timed test

15 questions · 13 auto-graded MCQ + 2 self-marked written.

MCQ 11 Mark
The process by which nuclei having low masses are united to form nuclei with large masses is
  • A
    chemical reaction
  • B
    nuclear fission
  • ✓
    nuclear fusion
  • D
    chain reaction
Answer
Correct option: C.
nuclear fusion
View full question & answer→
MCQ 21 Mark
The radioactive isotope used in the treatment of Leukemia is
  • A
    ${ }^{60} Co$
  • B
    ${ }^{226} Ra$
  • ✓
    ${ }^{32} p$
  • D
    ${ }^{131}|$
Answer
Correct option: C.
${ }^{32} p$
View full question & answer→
MCQ 31 Mark
${ }_{27}^{60} CO$ decays with half-life of 5.27 years to produce ${ }_{28}^{60} Ni$. What is the decay constant for such radioactive disintegration?
  • ✓
    $0.132 y ^{-1}$
  • B
    $0.138$
  • C
    $29.6 y$
  • D
    $13.8\%$
Answer
Correct option: A.
$0.132 y ^{-1}$
$0.132 y ^{-1}$
View full question & answer→
MCQ 41 Mark
The missing particle from the nuclear reaction is
$
{ }_{13}^{27} Al +{ }_2^4 He \longrightarrow ?+{ }_0^1 n
$
  • ✓
    ${ }_{15}^{30} P$
  • B
    ${ }_{16}^{32} S$
  • C
    ${ }_{10}^{14} Ne$
  • D
    ${ }_{14} Si$
Answer
Correct option: A.
${ }_{15}^{30} P$
View full question & answer→
Question 51 Mark
Identify nuclear fusion reaction
a. ${ }_1^1 H +{ }_1^1 H \longrightarrow{ }_1^2 H +{ }_1^0 e$
b. ${ }_1^2 H +{ }_1^1 H \longrightarrow{ }_2^3 He$
c. ${ }_1^3 H +{ }_1^1 H \longrightarrow{ }_1^3 H +{ }_1^1 p$
Answer
Among the given options, reactions (i) and (ii) represent nuclear fusion reactions wherein lighter nuclei combine to form a heavy nucleus.
View full question & answer→
MCQ 61 Mark
If a radioactive nuclide of group 15 element undergoes β-particle emission, the daughter element will be found in ………………..
  • ✓
    16 group
  • B
    14 group
  • C
    13 group
  • D
    same group
Answer
Correct option: A.
16 group
(A) 16 group
View full question & answer→
MCQ 71 Mark
The composition of an α-particle can be expressed as ……………….
  • A
    1p + 1n
  • B
    1p + 2n
  • C
    2p + 1n
  • ✓
    2p + 2n
Answer
Correct option: D.
2p + 2n
(D) 2p + 2n
View full question & answer→
MCQ 81 Mark
The half-life of an element is $5 d$. How much time is required for the decay of $7/8^{th} $ of the sample?
  • A
    $5 d$
  • B
    $10 d$
  • ✓
    $15 d$
  • D
    $35/8 d$
Answer
Correct option: C.
$15 d$
$15 d$
View full question & answer→
MCQ 91 Mark
The half-life of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 year is ……….
  • A
    $\frac{1}{2}$
  • B
    $\frac{1}{4}$
  • C
    $\frac{1}{8}$
  • ✓
    $\frac{1}{16}$
Answer
Correct option: D.
$\frac{1}{16}$
(D) $\frac{1}{16}$
View full question & answer→
MCQ 101 Mark
A radioactive decay of element X (Z = 90) is 30 % complete in 30 minutes. It has a half-life period of ……………
  • A
    24.3 min
  • ✓
    58.3 min
  • C
    102.3 min
  • D
    120.3 min
Answer
Correct option: B.
58.3 min
(B) 58.3 min
View full question & answer→
MCQ 111 Mark
The half-life of radioactive element $X$ having decay constant of $1.7 \times$ $10^{-5} s ^{-1}$ is ....... .
  • A
    $21.5 h$
  • B
    $19.7 h$
  • ✓
    $11.3 h$
  • D
    $2.8 h$
Answer
Correct option: C.
$11.3 h$
(C) $11.3 h$
View full question & answer→
MCQ 121 Mark
The decay constant for $67 Ga$ is $7.0 \times 10^{-4} s ^{-1}$. If initial concentration of is $0.07 g$, what is the half-life of ${ }^{67} Ga$ ?
  • ✓
    $990 s$
  • B
    $79.2 s$
  • C
    $12375 s$
  • D
    $10.10 \times 10^{-4} s$
Answer
Correct option: A.
$990 s$
(A) $990 s$
View full question & answer→
MCQ 131 Mark
The probability of decay of a radioactive element depends on …………..
i. the age of nucleus
ii. the presence of catalyst
iii. pressure
iv. Temperature
  • A
    only i. and iv
  • B
    all of these
  • C
    only ii. And iii.
  • ✓
    none of these
Answer
Correct option: D.
none of these
(D) none of these
View full question & answer→
MCQ 141 Mark
Which of the following nuclides has the magic number of both protons and neutrons?
  • A
    ${ }_{50}^{115} Sn$
  • B
    ${ }_{81}^{206} Pb$
  • C
    ${ }_{82}^{208} Pb$
  • D
    ${ }_{50}^{118} Pb$
View full question & answer→
MCQ 151 Mark
Radius of the nucleus is related to the mass number A by ………….
  • A
    $R=R_0 A^{1 / 2}$
  • B
    $R=R_0 A$
  • C
    $R=R_0 A^2$
  • ✓
    $R=R_0 A^{1 / 3}$
Answer
Correct option: D.
$R=R_0 A^{1 / 3}$
(D) $R=R_0 A^{1 / 3}$
View full question & answer→
Generate Paper FreeAll Nuclear Chemistry and Radioactivity topics