All Free Physics MCQs with Answers
Every Physics question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,934 questions · page 671 of 697
- A. Hydrogen
- B. Helium
- C. Nucleons
- D. Positrons
Explanation: Nuclear fusion in the sun involves the transformation of hydrogen into helium.
Correct answer: Helium- A. Three quarks
- B. Two quarks
- C. Two quarks and an anti-quark
- D. One quark and one anti-quark
Explanation: Baryons are heavy subatomic particles that are made up of three quarks.
Correct answer: Three quarks- A. C13
- B. N15
- C. F19
- D. O16
Explanation: The correct answer is O16. O16 has an even number of nucleons (8 protons and 8 neutrons), leading to a nuclear spin quantum number of 0.
Correct answer: O16- A. Proton - proton cycle
- B. Carbon- carbon cycle
- C. Co-co cycle
- D. Only A & B
Explanation: So, in the core of the Sun, there are high temperatures and pressures that allow for nuclear fusion to occur.
Correct answer: Only A & B- A. 1.00073
- B. 1.00087
- C. 1.0073
- D. 1.0087
Explanation: The relative atomic mass of a neutron is approximately 1.0073 atomic mass units (amu).
Correct answer: 1.0073- A. Neutron
- B. Proton
- C. Electron
- D. Positron
Explanation: When one up quark and two down quarks combine, they form a neutron. Neutrons are subatomic particles that are found in the nucleus of…
Correct answer: Neutron13407. Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is:
- A. Smaller
- B. Greater
- C. Same
- D. Infinite
Explanation: The mass of the resultant nucleus is indeed smaller than the sum of the masses of its constituent nucleons.
Correct answer: Greater- A. Proton
- B. Neutrino
- C. Photon
- D. Pion
Explanation: A boson is a type of elementary particle that obeys Bose-Einstein statistics. Photons are examples of bosons.
Correct answer: Photon- A. F-1=1/4πe0 x q1q2/r2 x r
- B. F = 1/4πe0 x q1q2/r2 x r
- C. F-1 = 1/4πe x q1q2/r2 x r
- D. F = 1/4πe x q1q2/r2 x r
Explanation: According to the expression of coulomb's law, the magnitude of Coulomb's force is directly proportional to the product of two point…
Correct answer: F = 1/4πe0 x q1q2/r2 x r- A. Lost electrons
- B. Lost protons
- C. Gained protons
- D. Gained electrons
Explanation: When a neutral body becomes positively charged, it means it has lost electrons.
Correct answer: Lost electrons13411. The Ratio of electro force between two protons to that between two electrons is of the order of:
- A. 1042
- B. 1039
- C. 1036
- D. 1
Explanation: d) 1This option suggests that the ratio of the electrostatic force between two protons to that between two electrons is 1.
Correct answer: 113412. When 1012 electrons are received from a neutral metal sphere. The charge on the sphere becomes:
- A. 0.16uc
- B. -0.16uc
- C. 0.32uc
- D. -0.32uc
Explanation: The formula used is q (charge) = n x e so q = 1012 x 1.6x10-19 =1.6x10-7=0.16 ucAs it is numerical, it can have only one possible answer.
Correct answer: 0.16uc- A. Polarity
- B. Optical activity
- C. Anisotropy
- D. Cleavage plane
Explanation: .A is incorrect since polarity is a separation of electric charge leading to a molecule or its chemical groups having an electric dipole…
Correct answer: Anisotropy- A. critical temperature
- B. absolute temperature
- C. Curie Temperature
- D. normal temperature
Explanation: Ferromagnetic MATERIALS can be permanently magnetized. Curie Temperature: The temperature at which the ferromagnetic element starts to…
Correct answer: Curie Temperature- A. Amorphous substances have a sharp melting point
- B. Amorphous substances do not have a fixed melting point
- C. Amorphous substances have proper geometrical shapes
- D. The particles in amorphous substances are arranged in an orderly manner
Explanation: Amorphous solids, unlike crystalline solids, do not have a fixed melting point.
Correct answer: Amorphous substances do not have a fixed melting point- A. Coefficient of thermal expansion
- B. Lattice energy
- C. Viscosity
- D. Infrared spectroscopy
Explanation: Anisotropy is the property of a material which allows it to change or assume different properties in different directions so the correct…
Correct answer: Coefficient of thermal expansion- A. Diamond
- B. Graphite
- C. Glass
- D. Rock salt
Explanation: Glass is an isotropic material, meaning its properties are the same in all directions.
Correct answer: Glass- A. Stiffness of solids
- B. Strength of solid
- C. Ductility of solids
- D. Toughness of solid
Explanation: Strength measures how much stress can be applied to an element before it deforms permanently or fractures.
Correct answer: Strength of solid- A. Stiffness of solids
- B. Strength of solid
- C. Ductility of solids
- D. Toughness of solid
Explanation: Strength measures how much stress can be applied to an element before it deforms permanently or fractures.
Correct answer: Strength of solid- A. Elastic substances
- B. Inelastic substances
- C. Diamagnetic substances
- D. Ductile substances
Explanation: Elastic substances are materials that undergo deformation when subjected to small forces, but they can return to their original shape and…
Correct answer: Elastic substances