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CBSE

Subject

Physics

NEET Physics : Nuclei

Multiple Choice Questions

151.

A particle of mass m at rest decays into two particles of masses m₁ and m₂ having non zero velocities. The ratio of de-Broglie wavelengths of the particles $\frac{λ_{1}}{λ_{2}}$ is

m₁/m₂
m₂/m₁
1.0
$\sqrt{\frac{m_{2}}{m_{1}}}$

152.

For the stability of any nucleus:

binding energy per nucleon will be more
binding energy per nucleon will be less
no. of electrons will be more
none of these

153.

A radioactive substance has activity 64 times higher than the required normal level. If T_1/2 = 2h, then the time, after which it should be possible to work with it, is:

16 h
6 h
10 h
12 h

154.

If the half-life of any sample of a radioactive substance is 4 days, then the fraction of the sample will remain undecayed after 2 days, will be

$\sqrt{2}$
$\frac{1}{\sqrt{2}}$
$\frac{\sqrt{2} - 1}{\sqrt{2}}$
$\frac{1}{2}$

155.

A radioisotope has a half-life of 5 yr. The fraction of the atoms of this material that would decay in 15 yr will be

156.

Nuclear fusion is common to the pairs :

thermonuclear reactor, uranium based nuclear reactor
energy production in sun, uranium-based nuclear reactor
energy production in sun, hydrogen bomb
the disintegration of heavy nuclei, hydrogen bomb

157.

In nuclear reaction

${}_{72}^{180}X \overset{- α}{\to} Y \overset{- β}{\to} Z \overset{- α}{\to} A \overset{- γ}{\to} P$

the atomic mass and number of P are, respectively:

170,69
172,69
172,70
170,70

158.

In a mean life of radioactive sample :

about $\frac{1}{3}$ of substance disintegrates
about $\frac{2}{3}$ of substance disintegrates
about 90% of the substance disintegrates
almost all the substance disintegrates

159.

A radioactive substance contains 10000 nuclei and its half-life period is 20 days. The number of nuclei present at the end of 10 days is

7070
9000
8000
7500

160.

Which of the following nuclei is fissionable but not possible?

${}_{92}U^{235}$
${}_{92}U^{233}$
${}_{92}U^{238}$
${}_{94}{Pu}^{239}$

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