When a object is heated, what physical changes are observed?

What type of defect can arise when a solid is heated? Which physical property is affected by it and in what way?

What type of defect can arise when a solid is heated ? Which physical property is affected by it and in what way ?

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

What is the physical change occurs when the source of sound is stationary but the observer moves?