Units and Measurements (Class 11 Physics)

Master the SI unit system, derived units, and measurement techniques essential for all physics studies.

Units and Measurements (Class 11 Physics)

Master the SI unit system, derived units, and measurement techniques essential for all physics studies.

✓ 100% Free ✓ No Login Needed ✓ NCERT / CBSE Aligned ✓ Download as PDF

TL;DR: Master the SI unit system, derived units, and measurement techniques essential for all physics studies.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated

🤖 Stuck on any question? Ask Syllab's free AI Tutor for a step-by-step explanation — instant, unlimited, no login.

Master the SI unit system, derived units, and measurement techniques essential for all physics studies.

Units and Measurements MCQs with Answers & Explanations

Q1. What are the fundamental SI base units for length, mass, and time?

  1. cm, gram, second
  2. foot, pound, second
  3. inch, ounce, minute
  4. meter, kilogram, second ✓ (correct)

Explanation: The SI base units are: meter (m) for length, kilogram (kg) for mass, and second (s) for time. These form the foundation of all measurements.

Q2. What is a derived unit?

  1. Unit obtained by combining base units ✓ (correct)
  2. Non-standard unit
  3. Temporary unit
  4. Base unit

Explanation: Derived units are formed by combining base units. Examples: m/s (velocity), m² (area), kg·m/s² (force or Newton).

Q3. What is the SI unit of force?

  1. Kilogram
  2. Newton ✓ (correct)
  3. Pascal
  4. Dyne

Explanation: The SI unit of force is Newton (N). 1 N = 1 kg·m/s². It is the force needed to accelerate 1 kg at 1 m/s².

Q4. How many meters are in 1 kilometer?

  1. 10 m
  2. 100 m
  3. 1000 m ✓ (correct)
  4. 10,000 m

Explanation: 1 kilometer = 1000 meters. The prefix kilo- means 1000.

Q5. What does the prefix milli- represent?

  1. 100
  2. 1000
  3. 0.01
  4. 0.001 ✓ (correct)

Explanation: Milli- represents 10^-3 or 0.001. 1 millimeter = 0.001 meter.

Q6. What is the SI unit of energy?

  1. Joule ✓ (correct)
  2. Watt
  3. Pascal
  4. Calorie

Explanation: The SI unit of energy is Joule (J). 1 J = 1 kg·m²/s². Calories are used in older measurements.

Q7. How many centimeters are in 1 inch?

  1. 10 cm
  2. 2.54 cm ✓ (correct)
  3. 25.4 cm
  4. 1 cm

Explanation: 1 inch = 2.54 centimeters. This conversion relates imperial and metric units.

Q8. What is the significance of significant figures?

  1. No importance
  2. Used only in chemistry
  3. Indicates precision of measurement ✓ (correct)
  4. Always equal to 3

Explanation: Significant figures indicate the precision of a measurement. They include all certain digits plus one estimated digit.

Q9. What is the SI unit of temperature?

  1. Degree Fahrenheit
  2. Rankine
  3. Degree Celsius
  4. Kelvin ✓ (correct)

Explanation: The SI unit of temperature is Kelvin (K). Although Celsius is commonly used, Kelvin is the SI unit for thermodynamic temperature.

Q10. How do you convert Celsius to Kelvin?

  1. Add 273.15 ✓ (correct)
  2. Subtract 273.15
  3. Multiply by 273.15
  4. Divide by 273.15

Explanation: K = °C + 273.15. Example: 0°C = 273.15 K. This conversion accounts for absolute zero at -273.15°C.

Frequently Asked Questions

Why is the SI system preferred over other systems?

The SI system is universally accepted, systematic, and decimal-based. It simplifies calculations and enables international scientific communication.

What is the difference between accuracy and precision?

Accuracy measures how close a measurement is to the true value. Precision measures how consistent repeated measurements are. Both are important.

More Class 11 Physics MCQs

🤖 Stuck on any of these? Ask Syllab's free AI Tutor to explain step by step →

More free resources for this chapter