NCERT Class 11 Physics Exemplar solutions helping students master concepts with clear problem-solving practice. Dr.Sanjaykumar Pawar Units And Measurements Units and Measurements MCQs with Solutions Units and Measurements - MCQs with Step-by-Step Solutions Q.1 The number of significant figures in 0.06900 is (a) 5 (b) 4 (c) 2 (d) 3 Thinking Process If the number is less than 1, the zeros before the first non-zero digit are not significant. Trailing zeros after a decimal point are significant. Number = 0.06900 0 → Not significant 0 → Not significant 6 → Significant 9 → Significant 0 → Significant 0 → Significant Total significant figures = 4 Answer: (b) 4 Q.2 The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figures is (a) 663.821 (b) 664 (c) 663.8 (d) 663.82 Step 1: Add the Numbers 436.32 + 227.2 + 0.301 = 663.821 Step 2: Apply Significant Figure Rule For addition and subtraction, the result should h...
Class XI Physics Summer Assignment - Subject Enrichment Activity I Class XI Physics Summer Assignment Subject Enrichment Activity – I Q.1 Define Significant Figure? Write down one example. Definition: Significant figures are the meaningful digits in a measured or calculated quantity which are known with certainty plus one final digit that is estimated or uncertain. They indicate the precision of a measurement. Example: In the measurement 2.308 cm , there are 4 significant figures (2, 3, 0 and 8). Q.2 List two commonly used practical units. How are these units related to S.I. units? Light Year (ly): Used for large astronomical distances. Relation with SI unit: 1 light year ≈ 9.46 × 10 15 m Horsepower (hp): Used for power. Relation with SI unit: 1 hp = 746 W Q.3 Define practical units of distance: Light Year and Parallactic Second (Parsec). Light Year (ly): It is the distance travelled by light in vacuum in one year. Parsec (pc): It...