NUST NET Physics — Nuclear Physics
Nuclear Physics 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 Nuclear Physics is tested
Across the 8 NET-pattern papers on ParhaiKrlo, Nuclear Physics 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 | 2 |
| NUST NET Past Paper 02 | 3 |
Nuclear 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 · Nuclear Physics
A radioactive sample of 16 g has a half-life of 5 days. The mass remaining after 20 days is:
- A.1 g
- B.2 g
- C.4 g
- D.0.5 g
Show answer
Answer: A. 1 g — 20 days = 4 half-lives: 16 → 8 → 4 → 2 → 1 g.
- Q2 · NUST NET Past Paper 08 · Nuclear Physics
The half-life T½ and the decay constant λ of a radioactive substance are related by:
- A.T½ = λ/0.693
- B.T½ = 0.693 λ
- C.T½ = 1/λ
- D.T½ = 0.693/λ
Show answer
Answer: D. T½ = 0.693/λ — T½ = ln 2/λ = 0.693/λ.
- Q3 · NUST NET Past Paper 05 · Nuclear Physics
What fraction of a radioactive sample has decayed after 3 half-lives?
- A.1/8
- B.7/8
- C.3/8
- D.1/3
Show answer
Answer: B. 7/8 — After 3 half-lives (1/2)³ = 1/8 remains, so 7/8 has decayed.