MHT CET 2025 Physics question
A thermometer bulb has volume m and cross-section of the stem is 0.002 cm. The bulb is filled with mercury at 0C. If the thermometer reads temperature as 100C, then the length of mercury column is (coefficient of cubical expansion of mercury = 18 10 /C)
Answer: (B)
Solution
The mercury expands on heating and the extra volume goes into the stem: (using ). The stem cross-section is cm, so the
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