Q. Which of the following applications does not involve thermal expansion?

निम्नलिखित में से किस अनुप्रयोग में थर्मल विस्तार शामिल नहीं है?

A
Railway tracks
रेलवे ट्रैक
B
Bimetallic thermostat
द्विधातु थर्मोस्टेट
C
Bridges with expansion joints
विस्तार जोड़ों वाले पुल
D
Pendulum clocks
पेंडुलम घड़ियाँ

Explanation

Railway tracks, bridges with expansion joints, and bimetallic thermostats all deal with changes in dimensions due to thermal expansion.

Pendulum clocks, however, are actually negatively affected by thermal expansion. The length of the pendulum can change with temperature, which alters timekeeping accuracy—but the design of a pendulum clock does not utilize thermal expansion as a functional principle.

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