Subatomic Particles - MCQ Practice Set

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01. Which of the following statements regarding subatomic particles is true?
a) They are larger than atoms
b) They are the smallest constituents of matter
c) They do not contribute to the mass of atoms
d) They are not involved in chemical bonding
Answer: b) They are the smallest constituents of matter
Explanation: Subatomic particles are particles that are smaller than atoms and constitute the building blocks of matter, making option b the correct choice.

02. What is the electric charge of an electron?
a) +1.602 x 10⁻¹⁹ coulombs
b) -1.602 x 10⁻¹⁹ coulombs
c) 0 coulombs
d) +9.109 x 10⁻³¹ kilograms
Answer: b) -1.602 x 10⁻¹⁹ coulombs
Explanation: Electrons carry a negative electric charge of -1.602 x 10⁻¹⁹ coulombs.

03. What is the primary role of electrons in atoms?
a) Contributing to the stability of atomic nuclei
b) Determining the atomic number
c) Participating in chemical bonding
d) Carrying a positive electric charge
Answer: c) Participating in chemical bonding
Explanation: Electrons are responsible for chemical bonding and the formation of chemical compounds through interactions with other atoms.

04. Which subatomic particle contributes to the mass of an atom?
a) Neutron
b) Electron
c) Proton
d) Positron
Answer: a) Neutron
Explanation: Both protons and neutrons contribute to the mass of an atom, but the neutron is the correct choice as it is specifically stated in the passage.

05. What is the electric charge of a proton?
a) -1.602 x 10⁻¹⁹ coulombs
b) +1.602 x 10⁻¹⁹ coulombs
c) 0 coulombs
d) +1.675 x 10⁻²⁷ kilograms
Answer: b) +1.602 x 10⁻¹⁹ coulombs
Explanation: Protons carry a positive electric charge of +1.602 x 10⁻¹⁹ coulombs.

06. Which subatomic particle is electrically neutral?
a) Neutron
b) Electron
c) Proton
d) Positron
Answer: a) Neutron
Explanation: Neutrons are electrically neutral, meaning they carry no net electric charge.

07. What determines the chemical properties of an element?
a) Number of electrons
b) Number of protons
c) Number of neutrons
d) Atomic mass
Answer: b) Number of protons
Explanation: The number of protons in an atom determines its atomic number, which, in turn, determines the chemical properties of the element.

08. Which subatomic particle plays a crucial role in nuclear reactions?
a) Neutron
b) Electron
c) Proton
d) Positron
Answer: a) Neutron
Explanation: Neutrons play a crucial role in nuclear reactions, as mentioned in the passage, contributing to the stability of atomic nuclei through the strong nuclear force.




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