Copper is used in the production of………..?
a) Brick kilns
b) Children toys
c) Kitchen utilities
d) Electric wires
Copper and aluminum have effect on magnet of...
a) attract
b) repel
c) both attract and repel
d) no effect
Due to its high heat exchange rate, copper is used in……….
a) dispenser
b) refrigerator
c) AC
d) all of these
In the Composition of the earth, Aluminum is….%?
a) 27.5
b) 20.3
c) 14.5
d) 8.23
Formula of water is……..
a) H2O
b) Ho
c) H3o
d) Ho
Water is composed of one atom of oxygen and………….
a) one hydrogen
b) two hydrogen
c) three hydrogen
d) none of these
