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Physics Assertion (A) & Reason (B) MCQ

Model Paper 9 · Rajasthan Board (RBSE) STD 11 Science (Rajasthan - English Medium). 4 questions.

Questions

Assertion (A) & Reason (B) MCQ

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4 questions · timed · auto-graded

MCQ 11 Mark
Assertion (A): According to the law of conservation of mechanical energy change in potential energy is equal and opposite to the change in kinetic energy.
Reason (R): Mechanical energy is not a conserved quantity.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
(c) A is true but R is false.
Explanation: For conservative forces, the sum of kinetic and potential energies at any point remains constant throughout the motion. It does not depend upon time, this is known as law of conservation of mechanical energy. According to this rule, Kinetic energy + Potential Energy $= E =$ Constant or $\Delta T+\Delta U=0$ or $\Delta T=-\Delta U$
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MCQ 21 Mark
Assertion (A): A force act upon the earth revolving in a circular orbit about the sun. Hence work should be done on the earth.
Reason (R): The necessary centripetal force for the circular motion of the earth, comes from the gravitational force between earth and the sun.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
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MCQ 31 Mark
Assertion: Reversible system are difficult to find in real world.
Reason: Most processes are dissipative in nature.
  • A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • C
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.
Answer
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MCQ 41 Mark
Assertion (A): When a body is dropped or thrown horizontally from the same height, it would reach the ground at the same time.
Reason (R): Horizontal velocity has no effect on the vertical direction.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
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Assertion (A) & Reason (B) MCQ - Physics STD 11 Science Questions - Vidyadip