Unit II ( 2020-21 )
Std- VISubject- ChemistryM:M-20
Q1-Write
true or false against each statement:5m
i.
Nitrogen
gas makes up about71% of the air.
ii.
Soil
contains air.
iii.
Burning
of coal causes air pollution.
iv.
All
fuels burn in the presence of carbon dioxide.
v.
River
water is as saline as sea water.
Q2-Fill in the blanks with the suitable words- 5m
i.
The
thick layer of air surrounding the earth is called…………….
ii.
……………….gas
present in the air is used to make fertilizers.
iii.
The
oxygen present in the air is used
for……………..
iv.
Plant
lose water from their leaves by the process of………….
v.
The
water that is fit for drinking is called ………………..
Q3-Choose
the correct option- 5m
i.
Which
gas present in air is used by plants for making food throughphotosynthesis?
a.
Carbon
dioxide b. Oxygen
ii.
Which
gas present in the air do not support burning?
a.
oxygen
b. Nitrogen
iii.
Which
of these is not a waterborne disease?
a.
Diarrhoea b. Malaria
iv.
Flood
causes great damage to
a.
Humans
only. b. Human and animals
both
v.
The
process of seeping water into the ground is called-
a.
Aquiferb.
Infiltration
Q4- Give
one word for the following-
5m
i.
The
percentage of this gas in the air is 21% .__________
ii.
The
process by which oxygen gas is released in the air.________
iii.
A
substance which burns in the presence of air to give out heat and
light.________
iv.
Rain
with acid dissolved in it._____________
v.
Unwanted
and harmful substances that contaminate water._______
