9th Class Science Force and laws of motion Question Bank

done Assertion and Reason MCQs - Force and Laws of Motion Total Questions - 10

• question_answer1)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion No force is required by the body to remain in any state.

  Reason In uniform linear motion, acceleration has a finite value.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
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• question_answer2)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion When various forces are acting on a body, then body may accelerate or remain static.

  Reason Acceleration in a body is produced only due to resultant force acting on it.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
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• question_answer3)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion Inertia is the property by virtue of which the body is unable to change by itself the state of rest only.

  Reason The bodies do not change their state unless acted upon by an unbalanced external force.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer4)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion Mass is a measure of inertia of the body in linear motion.

  Reason Greater the mass, greater is the force required to change its state of rest or of uniform motion.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer5)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion If the net external force on the body is zero, then its acceleration is zero.

  Reason Acceleration does not depend on force.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer6)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion Road accidents occurring due to high speeds are much worse than accidents due to low speeds of vehicles.

  Reason Momentum of high speed vehicles is more than that of low speed vehicles.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
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• question_answer7)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion The slope of momentum-time graph gives the force.

  Reason Acceleration is given by the rate of change of momentum.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer8)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion Newton's 3rd law of motion is applicable only when bodies are in motion.

  Reason Newton's 3rd law applies to all types of forces.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
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• question_answer9)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion If two persons walking or running in opposite direction collide with each other, then both feel hurt.

  Reason Every action applies equal reaction.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer10)

  Direction: For questions given below two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below.

  Assertion To every action there is an equal and opposite reaction.

  Reason Thrust on a rocket depends upon exhaust speed of the gases.

  A)
  Both A and R are true and R is correct explanation of the A. done clear
  B)
  Both A and R are true but R is not the correct explanation of the A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
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