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