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Physics Assertion (A) & Reason (B) MCQ

MODEL PAPER 3 · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 4 questions.

Questions

Assertion (A) & Reason (B) MCQ

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4 questions · self-marked practice — reveal the answer and mark yourself.

MCQ 11 Mark
Assertion (A): An electric lamp is connected in series with a long solenoid of copper with air core and then connected to ac source. If an iron rod is inserted in solenoid, the lamp will become dim.
Reason (R): If an iron rod is inserted in solenoid, the inductance of solenoid increases.
  • 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
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
Explanation: Assertion and reason both are correct statements and reason is correct explanation for assertion.
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MCQ 21 Mark
Assertion (A): Colours are seen in thin layers of oil on the surface of the water.
Reason (R): White light is composed of several colours.
  • 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
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Both assertion and reason true but the reason is not the correct explanation of assertion. Colours are seen due to interference between light waves reflected by the upper and lower surfaces of the thin oil film.
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MCQ 31 Mark
Assertion (A): Two equipotential surfaces cannot cut each other.
Reason (R): Two equipotential surfaces cannot cut each other.
  • 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: The reason is false because the work done in bringing a unit positive charge from infinity to a point in the equatorial plane is equal and opposite for the two charges of the dipole.
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MCQ 41 Mark
Assertion (A): If the frequency of the incident light on a metal surface is doubled, the kinetic energy of emitted electrons is more than doubled.
Reason (R): The metal will provide additional energy to the emitted photoelectron for light of higher frequency than that for lower frequency.
  • 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
(a) Both A and R are true and R is the correct explanation of A.
Explanation: Yes, because the metal will provide additional energy to the emitted photoelectron for light of higher frequency than that for lower frequency.
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