___________ is a mammal who fly?

A). Ostrich
B). Bat
C). Peacock
D). None of these


Optical fibers are mainly used in —

A). Communication

B). Weaving

C). Musical Instruments

D). Food Industry


The first synthetic fiber made by man was

A). Rayon

B). Nylon

C). Polyester

D). Terycott


Polythene is industrially prepared by the polymerization of—

A). Methane

B). Styrene

C). Acetylene

D). Ethylene


Which of the following is the lightest substance?

A). Uranium
B.  Hydrogen
C.  Oxygen
D.  Nitrogen


For galvanizing of iron which of the following metals is used?

A). Aluminum
B). Copper
C). Zinc
D). Lead


A mixture of water and alcohol can be separated by—

A). Filtration

B). Evaporation

C). Distillation

D). Decantation


A substance which changes readily into vapor without heating is called

A). Efflorescent

B). Synthetic

C). Volatile

D). Effervescent


German biochemist, Emil Fischer—

A). Gave operon model

B). Compared the fit between enzyme substrate to lock and key

C). Proposed the theory of competitive inhibition

D). Proposed the feedback inhibition theory


Enzymes generally have—

A). Same PH and temperature optima

B). Same PH but different temperature

C). Different PH but same temperature

D). Different PH and temperature optima

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