Combustion cannot take place without………
a) Water
b)carbon
c) air
d) Zinc
On combustion, hydrocarbons produce:
NTS PST (2016/2017)
a) carbon dioxide and water
b) hydrogen and helium
c) oxygen and hydrogen
d) water and oxygen
e) water and helium
Breathing is a process that refers to inhaling and exhaling of…………
a) Gas
b) Molecule
c) Proton
d) air
Process of burning under presence of oxygen is known as ………………..
a) Combustion
b) reaction
c) Respiration
d) Production
In desert areas, water vapor content is………
a) Different
b) Higher
c) Low
d) Constant
When a gas is cooled or compressed it becomes a..
a) Solid
b) Liquid
c) Gas
d) Semi-solid
