ECAT Physics — Nuclear Physics
Nuclear Physics is part of the Physics section of the UET ECAT (30 of the 100 MCQs). It breaks into 5 subtopics, and we hold 18 ECAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (5)
How Nuclear Physics is tested
Across the 7 ECAT past papers on ParhaiKrlo, Nuclear Physics accounts for 3 questions. It appears in 2 of them, about 1.5 questions a paper. The heaviest was ECAT Past Paper 02, with 2 questions.
| Paper | Questions |
|---|---|
| ECAT Past Paper 02 | 2 |
| ECAT Past Paper 01 | 1 |
Nuclear Physics MCQs from the ECAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · ECAT Past Paper 02 · Nuclear Physics
New particles may be discovered with the help of:
- A.Wilson cloud chamber
- B.Solid state detector
- C.Geiger–Müller counter
- D.Geiger counter and fast detector
Show answer
Answer: A. Wilson cloud chamber — A cloud chamber shows each particle's track, so its charge, mass and energy can be studied: this led to discoveries such as the positron.
- Q2 · ECAT Past Paper 01 · Nuclear Physics
In ²³⁵₉₂U, the ratio of neutrons to nucleons is:
- A.143/235
- B.145/235
- C.235/143
- D.92/235
Show answer
Answer: A. 143/235 — Neutrons = 235 − 92 = 143; nucleons = 235; ratio 143/235.
- Q3 · ECAT Past Paper 02 · Nuclear Physics
The half-life of radium is 1590 years. In how many years will the Earth lose all its radium by radioactive decay?
- A.1590 × 10⁶ years
- B.1590 × 10¹² years
- C.1590 × 10²⁴ years
- D.Never
Show answer
Answer: D. Never — Decay is exponential: each half-life halves what is left, so the amount never becomes exactly zero.