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Home › Science › Physics Laws

Physics Laws — Science Questions & Practice

Practise 18 Physics Laws questions from Science for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

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Practice questions on Physics Laws — with answers

Try each question first, then open the answer. Explanations are included.

1. Which of the following describes 'Newton's Second Law of Motion'?

  1. AMass can neither be created nor destroyed in a chemical reaction
  2. BAt constant temperature, the pressure of a given mass of gas is inversely proportional to its volume
  3. CThe force acting on an object equals its mass times its acceleration (F = ma)
  4. DThe extension of a spring is directly proportional to the force applied, within its elastic limit
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Answer: C

'Newton's Second Law of Motion': The force acting on an object equals its mass times its acceleration (F = ma).

2. Which of the following describes 'Newton's Law of Universal Gravitation'?

  1. AEvery particle attracts every other particle with a force proportional to the product of their masses and inversely proportional to the square of the distance between them
  2. BMass can neither be created nor destroyed in a chemical reaction
  3. CEnergy can neither be created nor destroyed, only transformed from one form to another
  4. DPressure applied to a confined fluid is transmitted equally in all directions
Show answer

Answer: A

'Newton's Law of Universal Gravitation': Every particle attracts every other particle with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.

3. Which of the following describes 'Archimedes' Principle'?

  1. AA body immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced
  2. BThe force acting on an object equals its mass times its acceleration (F = ma)
  3. CEnergy can neither be created nor destroyed, only transformed from one form to another
  4. DAt constant temperature, the pressure of a given mass of gas is inversely proportional to its volume
Show answer

Answer: A

'Archimedes' Principle': A body immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced.

4. Which of the following describes 'Pascal's Law'?

  1. APressure applied to a confined fluid is transmitted equally in all directions
  2. BEnergy can neither be created nor destroyed, only transformed from one form to another
  3. CThe extension of a spring is directly proportional to the force applied, within its elastic limit
  4. DAn object at rest stays at rest, and an object in motion stays in motion, unless acted upon by an external force (Law of Inertia)
Show answer

Answer: A

'Pascal's Law': Pressure applied to a confined fluid is transmitted equally in all directions.

5. Which of the following describes 'Ohm's Law'?

  1. AThe current through a conductor is directly proportional to the voltage and inversely proportional to the resistance (V = IR)
  2. BAt constant temperature, the pressure of a given mass of gas is inversely proportional to its volume
  3. CAt constant pressure, the volume of a given mass of gas is directly proportional to its absolute temperature
  4. DFor every action, there is an equal and opposite reaction
Show answer

Answer: A

'Ohm's Law': The current through a conductor is directly proportional to the voltage and inversely proportional to the resistance (V = IR).

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