Practice MCQs For Radioactivity and the nuclear atom

This quiz contains practice questions for GCE ‘O’ level topic: Radioactivity and the nuclear atom. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

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1. Deuterium $^{2}_{1}\text{H}$ and tritium $^{3}_{1} \text{H}$ are two isotopes of hydrogen.

Compared to a deuterium atom, how many protons and neutrons does a tritium atom have?

	Protons	Neutrons
A	More	More
B	More	Same
C	Same	More
D	Same	Same

B

D

A

C

2. The results of the Rutherford experiment provide evidence for the presence of the nucleus within the atom.

What were scattered in this experiment?

gamma rays

alpha-particles

beta-particles

gold nuclei

3. The nucleus of a nitrogen atom can be represented as $^{14}_{7} \text{N}$.

The nucleus of this atom consists of

7 protons and 7 electrons.

14 protons and 7 neutrons.

7 protons and 7 neutrons.

14 protons and 7 electrons.

4. Which conclusion can be drawn from the Geiger-Marsden alpha-particle scattering experiment?

Electrons are arranged in orbits.

A positive charge is spread throughout the atom.

There is a dense nucleus in the atom.

Electrons are negatively charged.

5. Which equation shows a nuclear fission reaction?

$^{239}_{92}\text{U} \rightarrow \, ^{95}_{38}\text{Sr} + \, ^{141}_{54}\text{Xe} + 3 \text{ neutrons}$

$^{46}_{21}\text{Sc} \rightarrow \, ^{46}_{21}\text{Sc} + \text{gamma ray}$

$^{14}_{7}\text{N} + \text{neutron} \rightarrow \, ^{15}_{7}\text{N}$

$^{2}_{1}\text{H} + \, ^{2}_{1}\text{H} \rightarrow \, ^{4}_{2}\text{He}$

6. Which row gives the range and electrical charge of an alpha-particle?

	Range In Air	Electrical Charge
A	A few centimetres	Negative
B	A few centimetres	Positive
C	A few metres	Negative
D	A few metres	Positive

D

C

A

B

7. The ionization in air caused by three different radiations X, Y and Z are as follows:

Radiation	Ions produced per mm of path
X	4000
Y	50
Z	200

Which of the following correctly identifies the radiation X, Y and Z?

X: Beta particles, Y: Alpha particles, Z: Gamma rays

X: Alpha particles, Y: Gamma rays, Z: Beta particles

X: Gamma rays, Y: Beta particles, Z: Alpha particles

X: Alpha particles, Y: Beta particles, Z: Gamma rays

8. Which of the following affects the activity level of a radioactive source?

Increasing the temperature of the surroundings

None of the above

Increasing the pressure of the surroundings

Immersing the source in concentrated acid

9. A nucleus consists of 90 protons and 144 neutrons.

After emitting two beta-particles followed by an alpha-particle, this nucleus has:

90 protons and 142 neutrons.

86 protons and 140 neutrons.

90 protons and 140 neutrons.

86 protons and 142 neutrons.

10. The table shows the possible properties of radioactive emissions.

Which emission could be a beta-particle?

A

B

D

C

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