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Physics MCQs for NEET — Practice Questions with Answers

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Some radioactive nucleus may emit

Only one $α, β$ or $γ$ at a time

All the three $α, β$ and $γ$ one after another

All the three $α, β$ and $γ$ simultaneously

Only $α$ and $β$ simultaneously

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Explanation

(a) No radioactive substance emit both $α$ and $β$ particles simultaneously. Some substances emit $α$ -particles and some other emits $β$ -particles. $γ$ rays are emitted along with both and particles.

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Which can pass through 20 cm thickness of the steel

$α$ particles

$β$ particles

$γ$ rays

Ultraviolet rays

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Explanation

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The half-life period of radium is 1600 years. Its average life time will be

3200 years

4800 years

2319 years

4217 years

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Explanation

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What percentage of original radioactive atoms is left after five half lives

0.3%

31%

3.125%

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Explanation

(d) Fraction of atoms remains after five half lives
$\frac{N}{N_{0}} = {(\frac{1}{2})}^{t / T} = {(\frac{1}{2})}^{5 T / T} = \frac{1}{32}$
$\Rightarrow$ Percentage atom remains = $\frac{1}{32} \times 100 = 3.125 %$

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Beta rays emitted by a radioactive material are

Electromagnetic radiation

The electrons orbiting around the nucleus

Charged particles emitted by nucleus

Neutral particles

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Explanation

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Alpha rays emitted from a radioactive substance are

Negatively charged particles

Ionised hydrogen nuclei

Doubly ionised helium atom

Uncharged particles having the mass equal to proton

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Explanation

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Half life of ${Bi}^{210}$ is 5 days. If we start with 50,000
atoms of this isotope, the number of atoms left over after 10
days is

5,000

25,000

12,500

20,000

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Explanation

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A nucleus of atomic mass A and atomic number Z emits $β$ -particles. The atomic mass and atomic number of the resulting nucleus are

A, Z

A + 1, Z

A, Z + 1

A-4, Z-2

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Explanation

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The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 seconds. Its half life is

2 seconds

4 seconds

5 seconds

6 seconds

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Explanation

(c) $N = N_{0} {(\frac{1}{2})}^{t / T} \Rightarrow \frac{N_{0}}{64} = N_{0} {(\frac{1}{2})}^{30 / T} \Rightarrow T = \frac{30}{6} = 5 \sec$

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Radioactivity was discovered by

Becquerel

Pierre Curie

Roentgen

Rutherford

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Explanation

(a) Radioactivity was discovered by Becquerel .

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