ECAT Physics — Measurements
Measurements is part of the Physics section of the UET ECAT (30 of the 100 MCQs). It breaks into 4 subtopics, and we hold 22 ECAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (4)
How Measurements is tested
Across the 7 ECAT past papers on ParhaiKrlo, Measurements accounts for 4 questions. It appears in 3 of them, about 1.3 questions a paper. The heaviest was ECAT Past Paper 06, with 2 questions.
| Paper | Questions |
|---|---|
| ECAT Past Paper 06 | 2 |
| ECAT Past Paper 03 | 1 |
| ECAT Past Paper 01 | 1 |
Measurements MCQs from the ECAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · ECAT Past Paper 06 · Measurements
For a pendulum T = 2π√(L/g). L = 10 cm is known to 1 mm, and the time for 100 oscillations is 100 s, correct to the nearest second. The percentage uncertainty in g is approximately:
- A.3%
- B.5%
- C.15%
- D.10%
Show answer
Answer: A. 3% — g = 4π²L/T²: %g = %L + 2 × %T = 1% + 2 × 1% = 3%.
- Q2 · ECAT Past Paper 03 · Measurements
The dimensions of force are:
- A.[MLT]
- B.[MLT⁻²]
- C.[MLT⁻¹]
- D.[ML²T⁻²]
Show answer
Answer: B. [MLT⁻²] — F = ma: [M][LT⁻²] = [MLT⁻²].
- Q3 · ECAT Past Paper 01 · Measurements
One light year is equal to:
- A.9 × 10¹² m
- B.6 × 10¹² m
- C.9.5 × 10¹³ m
- D.None of these
Show answer
Answer: D. None of these — A light year is about 9.46 × 10¹⁵ m, which matches none of the listed values.