Page 44 - Genius Kidz Prudence Learning Sc-8

+
substances

of
suppor
+
Combustion
ignition
temperature
presence
the
requires
! ! Combustion requires the presence of combustible substances + ignition temperature + supporter
! Combustion requires the presence of combustible substances + ignition temperature + supporter
combustible
ter

of combustion. combustion.
of of combustion.

and
g
dio
ater
w
,
combustion
Complete
enerates
xide
carbon
whereas
incomplete
combustion
! Complete combustion generates carbon dioxide, water and energy whereas incomplete combustion
y
! ! Complete combustion generates carbon dioxide, water and energy whereas incomplete combustion
energ
and
y
carbon
xide
,
monoxide, water and energy.
w
produces carbon mono
produces carbon monoxide, water and energy. .
energ
produces
ater
w
can
slo
be
! Combustion can be slow, rapid or spontaneous.
Combustion
rapid
spontaneous
,
! ! Combustion can be slow, rapid or spontaneous.
or
.
substance
produces
that
bur
on
light
! ! Fuel is the combustible substance that produces heat and light on burning. .
! Fuel is the combustible substance that produces heat and light on burning.
ning
Fuel
is
the
combustible
heat
and
of
ter
substance
v
suppor
alongwith
aporizes
aseous
g
is
produced
Flame
! Flame is produced when the combustible substance vaporizes alongwith gaseous supporter of
the
combustible
when
! ! Flame is produced when the combustible substance vaporizes alongwith gaseous supporter of
combustion.
combustion.
combustion.
EXERCISE
EXERCISE
1. Multiple choice questions.
(a) Hydrogen has :
(i) Maximum calorific value (ii) Minimum calorific value
(iii) No calorific value (iv) All of these
(b) Biogas is an example of :

(i) Natural fuel (ii) Gaseous fuel
(iii) Liquid fuel (iv) Both (i) and (iii)
(c) Flame is the zone of combustion of :
(i) Gaseous fuel (ii) Solid fuel (iii) Liquid fuel (iv) None of these
(d) Acid rain can be caused by the burning of :
(i) Petrol (ii) CNG (iii) Coal (iv) Diesel
2. Fill in the blanks.
(a) _____________ zone is the non-luminous zone.
(b) Incomplete combustion products include _____________ .
(c) kJ/kg is the unit of _____________ .
(d) Most fuels are made of _____________ and _____________ .
3. Match the columns.
Column A Column B
(a) Good fuel (i) Supporter of combustion
(b) Oxygen (ii) White phosphorus
(c) Rapid combustion (iii) Cracker explosion
(d) Spontaneous combustion (iv) Cellular respiration
(e) Slow combustion (v) Low ignition temperature.
44