 
			 
			MCQOPTIONS
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				| 1. | Mark the incorrect statement. | 
| A. | Melting of wax is a physical change while burning of wax in a candle is a chemical change. | 
| B. | Metals expand on heating while contract on cooling. Both are physical changes. | 
| C. | The device can be switched off easily if the switch is in the neutral lead. | 
| D. | High and low tides in sea are the examples of non-periodic changes while growth of a tree is a periodic change. | 
| Answer» E. | |