MCQOPTIONS
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				| 1. | 
                                    What is normal radiation? | 
                            
| A. | Direct radiation | 
| B. | Sun s radiation and striking surface are perpendicular to each other | 
| C. | Incident solar radiation and striking surface are perpendicular to each other | 
| D. | Global insolation direct radiation | 
| Answer» C. Incident solar radiation and striking surface are perpendicular to each other | |