NUST NET Physics — Alternating Current
Alternating Current is part of the FSc Physics course that NUST NET-Engineering draws on (Physics is 60 of the 200 MCQs). It breaks into 2 subtopics, and we hold 45 NET-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Alternating Current is tested
Across the 8 NET-pattern papers on ParhaiKrlo, Alternating Current accounts for 18 questions. It appears in all 8, about 2.3 questions a paper. The heaviest was NUST NET Past Paper 04, with 3 questions, and the most recent is NUST NET Past Paper 07, with 2.
| Paper | Questions |
|---|---|
| NUST NET Past Paper 07 | 2 |
| NUST NET Past Paper 08 | 2 |
| NUST NET Past Paper 05 | 2 |
| NUST NET Past Paper 06 | 2 |
| NUST NET Past Paper 03 | 2 |
| NUST NET Past Paper 04 | 3 |
| NUST NET Past Paper 01 | 3 |
| NUST NET Past Paper 02 | 2 |
Alternating Current MCQs from the NET-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · NUST NET Past Paper 07 · Alternating Current
The peak value of an alternating voltage is 311 V. Its rms value is about:
- A.311 V
- B.220 V
- C.440 V
- D.156 V
Show answer
Answer: B. 220 V — V_rms = V₀/√2 = 311/1.414 ≈ 220 V.
- Q2 · NUST NET Past Paper 08 · Alternating Current
The reactance of an inductor in an AC circuit:
- A.decreases as the frequency increases
- B.is infinite for a steady DC supply
- C.increases as the frequency increases
- D.is independent of the frequency
Show answer
Answer: C. increases as the frequency increases — X_L = 2πfL, so it rises with frequency.
- Q3 · NUST NET Past Paper 05 · Alternating Current
The reactance of a capacitor in an AC circuit:
- A.increases as the frequency increases
- B.is independent of the frequency
- C.is zero for a steady DC supply
- D.decreases as the frequency increases
Show answer
Answer: D. decreases as the frequency increases — X_C = 1/(2πfC), so a higher frequency gives a lower reactance.