जब लोहे के एक ठोस गोले को समान रूप से गर्म किया जाता है, तो निम्नलिखित में से किस पैरामीटर में सबसे अधिक प्रतिशत वृद्धि होगी?

Small gaps are deliberately left between consecutive steel rails on a railway track to:

Given below are two statements, one labeled as Assertion (A) and the other as Reason (R). Select the correct answer from the options below. Assertion (A): A very hot glass cracks when cold water is poured onto it. Reason (R): Glass expands when heated and contracts when cooled.