486.When estimating working length using paralleling technique radiograph,how much enlargement of image is allowed

a.1mm
b.2mm
c.3mm
d.None

Ans-b.2mm

485. Thiamine deficiency causes decreased energy production because

 a) It is required for the process of transamination.
 b) It is co-factor in oxidative reduction .
c)It is co-enzyme for transketolase in pentose phosphate pathway .
d) It is co-enzyme for pyruvate dehydrogenase.

Ans-d) It is co-enzyme for pyruvate dehydrogenase.

484. Reactive arthritis is caused by

 a) Staph. aureus
b) H. influenza
c) N. gonnorhea
d)  E.coli

Ans-c) N. gonnorhea