In which of these ammonia is an excretory substances is termed:
A.Hen
B.Rat
C.Mosquitoes
D.Fresh water fishes
Author: BILAL KHATTAK
The substance used as neutron moderator in nuclear reactors is
A.ordinary water
B.heavy water
C.liquid hydrogen
D.liquid ammonia
An equipotential line
A.Has no velocity component tangent to it
B.Has uniformly varying dynamic pressure
C.Has no velocity component normal to it
D.Exists in case of rotational flow
E.Exists in case of turbulent flow only
Of the following, which one light – gathering??
A. Antenna complex
B. Reaction centre
C. Photosystem
D. None of these
