Constants In Physics -Multiple Choice Questions Quiz

Question 1: Which subatomic particle is responsible for the majority of an atom's mass?

(a) Proton
(b) Neutron
(c) Electron
(d) Photon

Question 2: What is the charge of an electron?

(a) Positive
(b) Negative
(c) Neutral
(d) No charge

Question 3: Which scientist proposed the planetary model of the atom, where electrons orbit the nucleus in specific energy levels?

(a) Niels Bohr
(b) Albert Einstein
(c) Max Planck
(d) Erwin Schrödinger

Question 4: The atomic number of an element is determined by the number of:

(a) Protons
(b) Neutrons
(c) Electrons
(d) Nucleons (protons + neutrons)

Question 5: The process by which an atom gains or loses electrons and becomes charged is called:

(a) Nuclear fusion
(b) Nuclear fission
(c) Ionization
(d) Excitation

Question 6: The phenomenon where an atom absorbs and then re-emits photons of specific wavelengths is known as:

(a) Ionization
(b) Excitation
(c) Diffraction
(d) Reflection

Question 7: What is the maximum number of electrons that can occupy the first energy level (K shell) in an atom?

(a) 2
(b) 8
(c) 18
(d) 32

Question 8: The process of radioactive decay involves the emission of:

(a) Electrons
(b) Protons
(c) Neutrons
(d) Alpha particles or beta particles

Question 9: Which of the following best represents the mass number of an atom?

(a) Number of protons
(b) Number of electrons
(c) Number of nucleons (protons + neutrons)
(d) Number of neutrons

Question 10: What happens to the wavelength of light when an electron moves from a higher energy level to a lower energy level?

(a) It increases
(b) It decreases
(c) It remains the same
(d) It becomes infinite

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Total score: /10

Answer key:

Question 1: b

Question 2: b

Question 3: a

Question 4: a

Question 5: c

Question 6: b

Question 7: a

Question 8: d

Question 9: c

Question 10: b