Atomic Physics Practice Questions

Thanaweya Amma (Egypt) · Thanaweya Physics · 134 free MCQs with instant results and detailed explanations.

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Sample Questions from Atomic Physics

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Easy

Which particle has a negative charge?

A. Proton

B. Neutron

C. Electron

D. Positron

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Correct Answer: C

Electrons carry a negative charge, whereas protons have a positive charge, neutrons have no charge, and positrons are the antiparticles of electrons but carry a positive charge.

Easy

If an atom has 6 protons, what is its atomic number?

A. 4

B. 6

C. 12

D. 14

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Correct Answer: B

The atomic number of an atom is defined by the number of protons in its nucleus. Thus, an atom with 6 protons has an atomic number of 6.

Easy

What is the charge of an electron?

A. -1.6 x 10⁻¹⁹ C

B. +1.6 x 10⁻¹⁹ C

C. 0 C

D. 1.6 x 10⁻¹⁹ C

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Correct Answer: A

The charge of an electron is approximately -1.6 x 10⁻¹⁹ coulombs, which is a fundamental constant in physics.

Medium

What is the primary force that holds the protons and neutrons together in the nucleus of an atom?

A. Electromagnetic force

B. Gravitational force

C. Strong nuclear force

D. Weak nuclear force

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Correct Answer: C

The strong nuclear force is the primary force that holds protons and neutrons together in the nucleus, overcoming the repulsion between the positively charged protons.

Medium

Which of the following particles is not found in the nucleus of an atom?

A. Proton

B. Neutron

C. Electron

D. None of the above

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Correct Answer: C

Electrons are not found in the nucleus of an atom; they orbit around the nucleus. Protons and neutrons, however, are present in the nucleus.

Medium

If the atomic number of an element is 12, how many electrons does a neutral atom of this element contain?

A. 6

B. 12

C. 24

D. 4

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Correct Answer: B

In a neutral atom, the number of electrons equals the atomic number, which is 12 in this case. Therefore, a neutral atom of this element contains 12 electrons.

Medium

What is the mass number of an element with 15 protons and 16 neutrons?

A. 15

B. 31

C. 16

D. 1

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Correct Answer: B

The mass number is calculated by adding the number of protons and neutrons. Here, 15 protons + 16 neutrons = 31.

Hard

What is the minimum energy required to remove an electron from a hydrogen atom in its ground state?

A. 13.6 eV

B. 1.5 eV

C. 3.4 eV

D. 27.2 eV

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Correct Answer: A

The minimum energy required to remove an electron from a hydrogen atom in its ground state is known as the ionization energy, which is 13.6 eV.

Hard

An atomic nucleus has a mass number of 12 and contains 6 protons. What is the number of neutrons in the nucleus?

A. 6

B. 12

C. 4

D. 18

Show Answer & Explanation

Correct Answer: A

The number of neutrons can be found by subtracting the number of protons from the mass number. Here, 12 (mass number) - 6 (protons) = 6 (neutrons).

Q10

Hard

A certain isotope has a half-life of 5 years. If you start with 80 grams of this isotope, how much will remain after 15 years?

A. 10 grams

B. 20 grams

C. 40 grams

D. 5 grams

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Correct Answer: A

After 15 years, which is 3 half-lives (5 years each), the amount of isotope remaining can be calculated as follows: 80g -> 40g after 5 years, 40g -> 20g after 10 years, and 20g -> 10g after 15 years.

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Atomic Physics — Thanaweya Amma (Egypt) Thanaweya Physics Practice Questions Online

This page contains 134 practice MCQs for the chapter Atomic Physics in Thanaweya Amma (Egypt) Thanaweya Physics. The questions are organized by difficulty — 41 easy, 68 medium, 25 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.