MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
The length of a rod is (12 ± 0.05) cm. What is the relative error of the length measurement?
Think it through first, then pick an option.
- a 12.05
- b 11.95
- c 0.42
- d 0.0042
Answer and explanation
Correct answer: d 0.0042
Relative error = 0.05 ÷ 12 = 0.0042.
Why the other options are wrong
- a 12.05: 12.05 cm is the maximum value; the relative error is a ratio, not a length.
- b 11.95: 11.95 cm is the minimum value; the relative error is a ratio, not a length.
- c 0.42: 0.42 is the percentage (0.0042 × 100 %); as a ratio the relative error is 0.0042.
Your account is open, so all 30,000+ MCQs from every chapter are yours. Start practising SSC Physics →
- Read the note for this topic
- Practise this chapter's MCQs against the clock
- Every board question in this chapter
Want to keep going?
A free account carries you on to the next questions and opens 30,000+ MCQs from every chapter. Join before launch and Chirkut bundles are 60% off.
The ones you missed, worth one more look