46. Pluronic F68 protects mammalian cells from damage stems as it is a/an

A. surface active agent which stabilizes foams
B. surface active agent which destabilizes foams
C. excellent source of vitamins
D. coagulant

47. Reynolds number for turbulent flow over a plate should be more than

A. 5 x 10^-5
B. 10⁶
C. 5 x 10⁵
D. 500