COMSATS Physics — Physical Optics
Physical Optics is part of the Physics section of the NTS NAT-IE test COMSATS admits on (10 of the 90 MCQs). It breaks into 2 subtopics, and we hold 7 NAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Physical Optics is tested
Across the 7 NAT-pattern papers on ParhaiKrlo, Physical Optics accounts for 3 questions. It appears in 3 of them, about 1 questions a paper. The heaviest was COMSATS Past Paper 07, with 1 question.
| Paper | Questions |
|---|---|
| COMSATS Past Paper 07 | 1 |
| COMSATS Past Paper 05 | 1 |
| COMSATS Past Paper 03 | 1 |
Physical Optics MCQs from the NAT-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · COMSATS Past Paper 07 · Physical Optics
Young's double-slit experiment shows that light:
- A.is a stream of particles only
- B.cannot travel through a vacuum
- C.behaves as a wave and can interfere
- D.is a longitudinal wave
Show answer
Answer: C. behaves as a wave and can interfere — Bright and dark fringes come from waves interfering.
- Q2 · COMSATS Past Paper 05 · Physical Optics
The fact that light can be polarized shows that light is:
- A.a mechanical wave
- B.a stream of particles only
- C.a transverse wave
- D.a longitudinal wave
Show answer
Answer: C. a transverse wave — Only transverse waves have vibrations that can be confined to one plane.
- Q3 · COMSATS Past Paper 03 · Physical Optics
Constructive interference occurs when the path difference between two coherent waves is:
- A.any value at all
- B.an odd number of half wavelengths ((n + ½)λ)
- C.a whole number of wavelengths (nλ)
- D.a quarter of a wavelength
Show answer
Answer: C. a whole number of wavelengths (nλ) — Waves arrive in phase when the path difference is 0, λ, 2λ, … = nλ.