 
			 
			MCQOPTIONS
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				| 1. | What do the birds do when they see some enemy? | 
| A. | Keep silence | 
| B. | Start chirping all together | 
| C. | Mass number =atomic number \[\times \] number of neutrons | 
| D. | None of these | 
| Answer» C. Mass number =atomic number \[\times \] number of neutrons | |