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Question 20 of 32

Q.Two statements as Assertion (A) and Reason (R) are given below. Read them carefully and select the correct option : Assertion (A) : Harappan Civilization had developed a precise system of weights and measures. Reason (R) : Metal scale-pans have been found. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.

CBSECBSE Class XII Board 2023MCQ· 1mImportance★★★★★
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The Harappans did develop a precise weight system (cubical weights in binary ratios), but metal scale-pans alone don't prove precision—the weights themselves do. Both statements are true, but R doesn't explain A.

The question tests whether you understand what constitutes evidence for a precise measurement system versus merely having weighing equipment. A civilization can possess scales without having standardized, mathematically consistent weights.

Why the Assertion is true

The Harappan Civilization (c. 2600–1900 BCE) is renowned among ancient cultures for its standardization. Archaeological excavations at Mohenjo-daro, Harappa, Lothal, and other sites have unearthed hundreds of cubical stone weights made from chert, jasper, agate, and other materials. The remarkable feature: these weights follow a precise binary system.

The standard unit was approximately 13.713.7 grams (often called the Harappan ratti), and weights were manufactured in ratios of 1,2,4,8,16,32,641, 2, 4, 8, 16, 32, 64 up to 12,80012,800 times this unit. Smaller weights used a decimal subdivision (0.05,0.1,0.2,0.50.05, 0.1, 0.2, 0.5 of the unit). This dual system—binary for larger weights, decimal for fractions—demonstrates sophisticated mathematical planning and quality control across the civilization's vast geographic spread.

Important

Precision in a weight system means standardization (same unit across cities) and mathematical consistency (predictable ratios), not just the existence of weighing tools.

Why the Reason is true but insufficient

Metal scale-pans have indeed been discovered at Harappan sites. These copper or bronze pans, often with suspension holes, confirm that the Harappans used balance scales for weighing. This is direct evidence of weighing activity.

However, scale-pans by themselves tell us nothing about precision. Any civilization with metallurgy could hammer out a pan and suspend it. What makes the Harappan system precise is the uniformity and mathematical progression of the weights, not the pans that held the goods being weighed.

The logical relationship

  1. Assertion (A) is true: The cubical weights in standardized ratios across hundreds of kilometers prove a precise system. …

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