Units Measurements Exemplar — Class 11 Physics NCERT Solutions (Free)

Free step-by-step NCERT solutions for Class 11 Physics chapter "Units Measurements Exemplar" — 5 important questions with detailed answers for CBSE board exam preparation.

TL;DR: Free step-by-step NCERT solutions for Class 11 Physics chapter "Units Measurements Exemplar" — 5 important questions with detailed answers for CBSE bo…

By Syllab.in · Updated Jun 17, 2026

Key Questions Covered:

Express 5000 g in kg and mg.
Convert 72 km/h to m/s.
Find dimensions of velocity.
Check dimensionally if equation v = u + at is correct.
What is significant figures? Round 23.456 to 3 significant figures.

Solutions Summary:

Question	Status
Express 5000 g in kg and mg.	✓ Solved
Convert 72 km/h to m/s.	✓ Solved
Find dimensions of velocity.	✓ Solved
Check dimensionally if equation v = u + at is correct.	✓ Solved
What is significant figures? Round 23.456 to 3 significan…	✓ Solved

Showing 5 of 5 questions

Q1: Express 5000 g in kg and mg.

5000 g = 5000/1000 kg = 5 kg. 5000 g = 5000 × 1000 mg = 5 × 10^6 mg.

Q2: Convert 72 km/h to m/s.

72 km/h = 72 × (1000 m)/(3600 s) = 72 × 5/18 = 20 m/s.

Q3: Find dimensions of velocity.

Velocity = displacement/time. Dimension = [L]/[T] = [LT^-1].

Q4: Check dimensionally if equation v = u + at is correct.

LHS: v has dimension [LT^-1]. RHS: u is [LT^-1], at = [LT^-2][T] = [LT^-1]. LHS = RHS dimensionally. Equation is dimensionally correct.

Q5: What is significant figures? Round 23.456 to 3 significant figures.

Significant figures are all digits that carry meaningful information about precision. 23.456 rounded to 3 SF = 23.5 (keeping 2, 3, 5 and rounding up last digit 4 to 5).

Showing 5 of 5 questions. Visit the full page for complete solutions.