NUST NET Physics — Optical Instruments
Optical Instruments is part of the FSc Physics course that NUST NET-Engineering draws on (Physics is 60 of the 200 MCQs). It breaks into 1 subtopic, and we hold 33 NET-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (1)
How Optical Instruments is tested
Across the 8 NET-pattern papers on ParhaiKrlo, Optical Instruments accounts for 12 questions. It appears in all 8, about 1.5 questions a paper. The heaviest was NUST NET Past Paper 06, with 2 questions, and the most recent is NUST NET Past Paper 07, with 1.
| Paper | Questions |
|---|---|
| NUST NET Past Paper 07 | 1 |
| NUST NET Past Paper 08 | 1 |
| NUST NET Past Paper 05 | 1 |
| NUST NET Past Paper 06 | 2 |
| NUST NET Past Paper 03 | 2 |
| NUST NET Past Paper 04 | 2 |
| NUST NET Past Paper 01 | 2 |
| NUST NET Past Paper 02 | 1 |
Optical Instruments 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 · Optical Instruments
The magnifying power of a simple microscope of focal length f, with the image formed at the near point d, is:
- A.d/f
- B.f/d
- C.1 + d/f
- D.1 − d/f
Show answer
Answer: C. 1 + d/f — M = 1 + d/f when the image is at the near point.
- Q2 · NUST NET Past Paper 08 · Optical Instruments
An astronomical telescope in normal adjustment has an objective of focal length 90 cm and an eyepiece of focal length 10 cm. The length of the telescope is:
- A.80 cm
- B.9 cm
- C.900 cm
- D.100 cm
Show answer
Answer: D. 100 cm — Normal adjustment: L = f₀ + fₑ = 90 + 10 = 100 cm.
- Q3 · NUST NET Past Paper 05 · Optical Instruments
In a compound microscope the objective gives a magnification of 10 and the eyepiece a magnification of 5. The total magnification is:
- A.15
- B.50
- C.2
- D.500
Show answer
Answer: B. 50 — Total magnification = m_objective × m_eyepiece = 10 × 5 = 50.