Practice mode / Physics What does Newton’s third law of motion state? A Option A: Temperature remaining constant, volume of a given mass of a gas varies inversely B Option B: For every action there is an equal and opposite reaction. C Option C: Attraction or repulsion between two charges D Option D: Volume of a given mass of gas increases or decreases Correct answer B. For every action there is an equal and opposite reaction. Explanation Newton's third law says forces always occur in pairs: when one body exerts a force on another, the second exerts an equal force in the opposite direction. Show answer Report a problem Answer checked 11 October 2026 · How we write and check questions
Question 01 / Physics Why does oil rise up the wick of a lamp? A Option A: Oil is very light B Option B: Diffusion of oil through the wick C Option C: Capillary action D Option D: Oil is volatile Correct answer C. Capillary action Show answer Open question
Question 02 / Physics Which of the following elements is not radioactive? A Option A: Thorium B Option B: Cadmium C Option C: Uranium D Option D: Radium Correct answer B. Cadmium Show answer Open question
Question 03 / Physics Which unit is most suitable for expressing the radius of a nucleus? A Option A: Micrometre B Option B: Nanometre C Option C: Fermi D Option D: Angstrom Correct answer C. Fermi Show answer Open question
Question 04 / Physics What is the turning effect of a force called? A Option A: Moment B Option B: Momentum C Option C: Torque D Option D: None of these Correct answer C. Torque Show answer Open question
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