NUST NET Physics — Dawn of Modern Physics
Dawn of Modern Physics is part of the FSc Physics course that NUST NET-Engineering draws on (Physics is 60 of the 200 MCQs). It breaks into 3 subtopics, and we hold 62 NET-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (3)
How Dawn of Modern Physics is tested
Across the 8 NET-pattern papers on ParhaiKrlo, Dawn of Modern Physics accounts for 24 questions. It appears in all 8, about 3 questions a paper. The heaviest was NUST NET Past Paper 07, with 3 questions.
| Paper | Questions |
|---|---|
| NUST NET Past Paper 07 | 3 |
| NUST NET Past Paper 08 | 3 |
| NUST NET Past Paper 05 | 3 |
| NUST NET Past Paper 06 | 3 |
| NUST NET Past Paper 03 | 3 |
| NUST NET Past Paper 04 | 3 |
| NUST NET Past Paper 01 | 3 |
| NUST NET Past Paper 02 | 3 |
Dawn of Modern Physics 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 · Dawn of Modern Physics
Light of photon energy 5 eV falls on a metal of work function 2 eV. The stopping potential is:
- A.7 V
- B.3 V
- C.2 V
- D.5 V
Show answer
Answer: B. 3 V — K_max = hf − φ = 5 − 2 = 3 eV, so the stopping potential is 3 V.
- Q2 · NUST NET Past Paper 08 · Dawn of Modern Physics
The energy of a photon of wavelength 400 nm is about (hc = 1240 eV nm):
- A.4.96 eV
- B.2.48 eV
- C.1.24 eV
- D.3.1 eV
Show answer
Answer: D. 3.1 eV — E = 1240/400 = 3.1 eV.
- Q3 · NUST NET Past Paper 05 · Dawn of Modern Physics
A metal has a work function of 2.48 eV. Its threshold wavelength is about (hc = 1240 eV nm):
- A.250 nm
- B.620 nm
- C.500 nm
- D.400 nm
Show answer
Answer: C. 500 nm — λ₀ = hc/φ = 1240/2.48 = 500 nm.