WorksheetsScience Quiz
Total questions: 10
Worksheet time: 6mins
What does Dry powder form of chemicals release to extinguish fire?
Soot
Carbon monoxide
Carbon dioxide
Carbon trichloride
Why does the flame always point upwards?
Gases produced during combustion are lighter than air
Gases produces during combustion are heavier than air
The flame pointing upward does matter if gas released is lighter or heavier
Inflammable substances have __________ ignition temperature
high
moderate
Extremely high
low
In reverse osmosis water is forced out through a ____________
hard membrane
semi-permeable membrane
permeable membrane
Impermeable membrane
Charcoal helps in _____________ of impurities
Absorbtion
Absorption
Desorption
Adsorption
Chemical treatment is done by which of the following:
answer choices
chlorine
Potassium permanganate
charcoal
ozone
Bleaching powder
What principle does Maglev train work on?
Friction
Repulsion between magnets
Attraction between magnets
All of the above
A rocket has been fired up to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launch pad.
Muscular force
Gravitational force
Frictional Force
Magnetic force
Electromagnetic force
Name the lubricant which is used in machinery where oil cannot be applied
fatty alcohols
Graphite
Grease
water
only oil can be used
What is produced when there is a photochemical reaction of sunlight with hydrocarbons and nitrogen oxides?
fog
Dust and residue
smoke
Smog
