MCQOPTIONS
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				| 1. | 
                                    Assertion (A): Secondary instruments require calibration at frequent intervals.Reason (R): Secondary instruments have many errors. | 
                            
| A. | Both A and R are true and R is correct explanation of A | 
| B. | Both A and R are true but R is not correct explanation of A | 
| C. | A is true R is false | 
| D. | A is false R is true | 
| Answer» B. Both A and R are true but R is not correct explanation of A | |