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

Free step-by-step NCERT solutions for Class 11 Physics chapter "Units and Measurements" — 8 important questions with detailed answers for CBSE board exam preparation.

TL;DR: Free step-by-step NCERT solutions for Class 11 Physics chapter "Units and Measurements" — 8 important questions with detailed answers for CBSE board e…

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Key Questions Covered:

  1. Define the SI unit of length and explain how the metre is defined.
  2. A student measures the thickness of a single sheet of paper using a screw gau…
  3. Express the following in scientific notation with appropriate significant fig…
  4. + 5 more questions in the full chapter

Solutions Summary:

Question Status
Define the SI unit of length and explain how the metre is… ✓ Solved
A student measures the thickness of a single sheet of pap… ✓ Solved
Express the following in scientific notation with appropr… ✓ Solved

Showing 3 of 8 questions

Q1: Define the SI unit of length and explain how the metre is defined.

The SI unit of length is the metre (m). Definition: The metre is defined as the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second. This definition was adopted at the 17th General Conference on Weights and Measures (CGPM) in 1983. It is based on the...

Q2: A student measures the thickness of a single sheet of paper using a screw gauge. If the main scale reading is 0 mm and the circular scale reading is 45 divisions (least count = 0.01 mm), calculate the thickness of the paper.

Given: Main scale reading (MSR) = 0 mm Circular scale reading (CSR) = 45 divisions Least count (LC) = 0.01 mm Formula: Reading = MSR + (CSR × LC) Step 1: Identify the main scale reading MSR = 0 mm Step 2: Calculate the circular scale contribution CSR contribution = 45 × 0.01 mm = 0.45 mm Step 3:...

Q3: Express the following in scientific notation with appropriate significant figures: (a) 0.000456 kg (b) 45000 m (c) 0.0050 A

Step 1: Identify significant figures and convert to scientific notation (a) 0.000456 kg - Significant figures: 3 (the zeros before 4 are not significant) - Scientific notation: 4.56 × 10⁻⁴ kg (b) 45000 m - Significant figures: 2 (assuming only 4 and 5 are significant; trailing zeros without decima...

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