Assertion–Reason MCQs (NCERT Based)
Assertion–Reason MCQs (NCERT Based)
Class: CBSE Class 12 | Subject: Physics
Section 10: Experimental Skills
Topic: Assertion–Reason Questions
Based on CBSE Board Examination Pattern
Section 10: Experimental Skills
Topic: Assertion–Reason Questions
Based on CBSE Board Examination Pattern
Instructions: Each question has an Assertion (A) and a Reason (R). Choose the correct option:
A) Both A and R are true and R explains A
B) Both A and R are true but R does not explain A
C) A is true but R is false
D) A is false but R is true
A) Both A and R are true and R explains A
B) Both A and R are true but R does not explain A
C) A is true but R is false
D) A is false but R is true
Assertion (A): In Ohm’s law experiment, V–I graph is a straight line.
Reason (R): Current is directly proportional to voltage.
Answer: A
Ohm’s law states V ∝ I, hence linear graph.
Ohm’s law states V ∝ I, hence linear graph.
Assertion (A): Ammeter is connected in series.
Reason (R): Ammeter has low resistance.
Answer: A
Low resistance ensures minimal circuit disturbance.
Low resistance ensures minimal circuit disturbance.
Assertion (A): Voltmeter is connected in parallel.
Reason (R): Voltmeter has high resistance.
Answer: A
Assertion (A): Potentiometer is more accurate than voltmeter.
Reason (R): It works on null deflection method.
Answer: A
Assertion (A): Interference proves wave nature of light.
Reason (R): Superposition of waves produces fringes.
Answer: A
A: Diffraction occurs for all waves.
R: Waves bend around obstacles.
Answer: A
A: Semiconductor resistance decreases with temperature.
R: Carrier concentration increases.
Answer: A
A: PN diode conducts in forward bias.
R: Barrier potential decreases.
Answer: A
A: Zener diode regulates voltage.
R: Operates in breakdown region.
Answer: A
A: Transistor amplifies signals.
R: Small base current controls large collector current.
Answer: A
A: Logic gates operate on binary signals.
R: Digital electronics uses 0 and 1.
Answer: A
A: AND gate output 1 for all 1 inputs.
R: Logical multiplication rule.
Answer: A
A: LED emits light.
R: Electron‑hole recombination releases photons.
Answer: A
A: Photoelectric effect supports particle nature.
R: Energy depends on frequency.
Answer: A
A: Convex lens forms real image.
R: Converges parallel rays.
Answer: A
A: Nuclear fusion releases energy.
R: Binding energy per nucleon increases.
Answer: A
A: Fission used in reactors.
R: Chain reaction controlled.
Answer: A
A: Potentiometer measures EMF.
R: Based on potential gradient.
Answer: A
A: AC has zero average value.
R: Positive & negative cycles cancel.
Answer: A
A: Transformer works on mutual induction.
R: Changing flux induces EMF.
Answer: A