Which of the following is a correct statement

(a) Beta rays are same as cathode rays
(b) Gamma rays are high energy neutrons
(c) Alpha particles are singly ionized helium atoms
(d) Protons and neutrons have exactly the same mass

Concept Questions :-

Types of decay
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

${}_{22}\mathrm{Ne}$ nucleus after absorbing energy decays into two $\mathrm{\alpha }$-particles and an unknown nucleus. The unknown nucleus is
(a) Nitrogen              (b) Carbon
(c) Boron                  (d) Oxygen

Concept Questions :-

Types of decay
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The half life of ${}_{131}\mathrm{I}$ is 8 days. Given a sample of ${}_{131}\mathrm{I}$ at time t = 0, we can assert that
(a) No nucleus will decay before t = 4 days
(b) No nucleus will decay before t = 8 days
(c) All nuclei will decay before t = 16 days
(d) A given nucleus may decay at any time after t = 0

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Carbon-14 decays with half-life of about 5,800 years. In a sample of bone, the ratio of carbon-14 to carbon-12 is found to be $\frac{1}{4}$ of what it is in free air. This bone may belong to a period about x centuries ago, where x is nearest to
(a) 2$×$58                        (b) 58
(c) 58/2                          (d) 3$×$58

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the disintegration series ${}_{92}{}^{238}\mathrm{U}\stackrel{\mathrm{\alpha }}{\to }\mathrm{X}\stackrel{\mathrm{\beta }-}{\to }{}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{Y}$
the values of Z and A respectively will be
(a) 92, 236                (b) 88, 230
(c) 90, 234                (d) 91, 234

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The particles emitted by radioactive decay are deflected by magnetic field. The particles will be
(a) Protons and $\mathrm{\alpha }$-particles
(b) Electrons, protons and $\mathrm{\alpha }$-particles
(c) Electrons, protons and neutrons
(d) Electrons and $\mathrm{\alpha }$-particles

Concept Questions :-

Types of decay

Difficulty Level:

Half life of a radioactive element is 10 days. The time during which quantity remains 1/10 of initial mass will be
(a) 100 days             (b) 50 days
(c) 33 days               (d) 16 days

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the given nuclear reaction A, B, C, D, E represents
${}_{92}{}^{238}\mathrm{U}\stackrel{\mathrm{\alpha }}{\to }{}_{\mathrm{B}}{}^{\mathrm{A}}\mathrm{Th}\stackrel{\mathrm{\beta }}{\to }{}_{\mathrm{D}}{}^{\mathrm{C}}\mathrm{Pa}\stackrel{\mathrm{E}}{\to }{}_{92}{}^{234}\mathrm{U}$

(a) A = 234, B = 90, C = 234, D = 91, E = $\mathrm{\beta }$
(b) A = 234, B = 90, C = 238, D = 94, E =$\mathrm{\alpha }$
(c) A = 238, B = 93, C = 234, D = 91, E = $\mathrm{\beta }$
(d) A = 234, B = 90, C = 234, D = 93, E = $\mathrm{\alpha }$

Concept Questions :-

Types of decay
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If half life of a radioactive element is 3 hours, after 9 hours its activity becomes
(a) 1/9                     (b) 1/27
(c) 1/6                     (d) 1/8

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The nucleus ${}_{48}{}^{115}\mathrm{Cd}$ after two successive ${\mathrm{\beta }}^{-}$ decays will give
(a) ${}_{46}{}^{115}\mathrm{Pa}$          (b) ${}_{49}{}^{114}\mathrm{In}$
(c) ${}_{50}{}^{113}\mathrm{Sn}$          (d) ${}_{50}{}^{115}\mathrm{Sn}$

Concept Questions :-

Types of decay