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CBSE 12 Physics
U9
Item 5

Multiple choice·Standard multi-step (3/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

Assertion (A): A rectifier output is called pulsating DC rather than pure DC. Reason (R): The output has one polarity but its magnitude still changes with time. Choose the correct option.

Choose an answer

A.Both A and R are true, and R explains A

B.A is true but R is false

C.Both A and R are true, but R does not explain A

D.A is false but R is true

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