Combustion and Flame Test

Result

Combustion and Flame Test - 20

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

A material when burnt gives out flame because of _________.

A
vaporization

B
Melting

C
Combustibility

D
Conductivity

Solution
Question 2
1 / -0

The colour of the flame in luminous zone is:

A
Blue

B
Red

C
Yellow

D
Black

Solution
Question 3
1 / -0

A circular blackish ring on the glass plate kept over the candle flame indicates ___________.

A
Complete combustion

B
Dark zone of the flame

C
Non-luminous zone

D
Luminous zone

Solution

A circular blackish ring on the glass plate kept over the candle flame indicates the luminous zone. The candle flame consists of mainly 3 zones depending on the temperature i.e the outer zone ( hottest among all, blue in colour, complete combustion occurs here and is the non-luminous part of the flame), middle zone ( moderately hot, yellow in colour, partial combution), inner zone (least hot and black in colour, and is the luminous part).
Question 4
1 / -0

Fire is extinguished by __________.

A
removing all combustible substances

B
cutting off the supply of air

C
cooling the burning substance

D
all of the above

Solution

Fire is extinguished by :
(A) Removing all combustible substances.
Fuel is one of the requirements for producing fire. In the absence of fuel, combustion will not occur.
(B) Cutting off the supply of air.
Air (oxygen) is essential for combustion. In the absence of air, combustion will not occur.
(C) Cooling the burning substance.
This reduces the temperature below its ignition temperature. So, the fire will not spread.
Question 5
1 / -0

The blue zone in a LPG flame indicates _________.

A
unburnt vapours

B
partial decomposition

C
moderately hot

D
hottest and complete combustion

Solution

Flame color determines the rate of combustion and thus the temperature difference producing a different color flame. In LPG the blue zone is the zone of complete combustion of fuel. So, the amount of soot decreases, and the temperature is highest as high heat is released.
Question 6
1 / -0

Choose the correct statement among the following.

A
The substances which vapourise during burning, do not give flames.

B
The substances which have very high ignition temperature are called inflammable substances.

C
When the matchstick is struck against the rubbing surface, some red phosphorous gets converted into white phosphorous.

D
The job of a fire extinguisher is to cut off the supply of carbon dioxide, and hence the fire is controlled.
Question 7
1 / -0

Which is the hottest part of Bunsen flame?

A
In the blue zone

B
Just above the tip of the primary flame

C
At the top of the outer core

D
Just above the inner core

Solution

The hottest part of the bunsen flame is just above the tip of the primary flame. It reaches about $$1500^oC$$.
This is the blue part of the bunsen flame, where the flame has the most oxygen.
Option $$B$$ is correct.
Question 8
1 / -0

Coal, petroleum, natural gas and propane are fossil fuels. They are called fossil fuels because ________.

A
they are burnt to release energy and they cause air pollution.

B
they were formed from the buried remains of plants and tiny animals that lived hundreds of millions of years ago.

C
they are non renewable and will run out.

D
they are mixed with fossils to provide energy.

Solution

Fossil fuels were formed from the buried remains of plants and tiny animals that lived hundereds of millions of years ago. Coal, petroleum, natural gas and propane all are formed by same process and hence known as fossil fuels.

Question 9

1 / -0

Match Column I with Column II and select the correct option from the codes given below.

	Column I		Column II
(a)	Hottest zone of a candle flame	(i)	Zone of unburnt wax vapours
(b)	Yellow zone of a candle flame	(ii)	Non-luminous zone
(c)	Black innermost zone of the candle flame	(iii)	Incomplete combustion zone

(a) - (i), (b) - (ii), (c) - (iii)

(a) - (ii), (b) - (i), (c) - (iii)

(a) - (i), (b) - (iii), (c) - (ii)

(a) - (ii), (b) - (iii), (c) - (i)

Solution

Candle flame has three zones as shown in figure.

The first zone is called an outer zone, the second zone is called the middle zone and the third is called the inner zone.

Due to complete combustion, the outer zone is blue in colour and therefore hottest zone.
The middle part is the partial combustion zone and is yellow in colour and this part is moderately hot.
Whereas the inner zone is called a dark zone which has the least unburnt vapours and thus is black in colour.

Depending upon the above explanation

The correct match is:- (a) - (ii), (b) - (iii), (c) - (i)
Hottest zone of candle flame $$ \rightarrow $$ Non-luminous zone.
Yellow zone of candle flame $$ \rightarrow $$ Incomplete combustion zone.
Black innermost zone of the candle flame $$ \rightarrow $$ Zone of unburnt wax vapours.

Question 10
1 / -0

The combustion in which a material bursts into flames without the application of heat is known as :

A
complete combustion

B
spontaneous combustion

C
slow combustion

D
none of these

Solution

The type of combustion in which a material suddenly bursts into flames, without the application of heat or any apparent cause is called spontaneous combustion.
Option $$B$$ is correct.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 20

Result

Combustion and Flame Test - 20

Score

-

Rank

-

SHARING IS CARING

Question 1

vaporization

Melting

Combustibility

Conductivity

Solution

Question 2

Blue

Red

Yellow

Black

Solution

Question 3

Complete combustion

Dark zone of the flame

Non-luminous zone

Luminous zone

Solution

Question 4

removing all combustible substances

cutting off the supply of air

cooling the burning substance

all of the above

Solution

Question 5

unburnt vapours

partial decomposition

moderately hot

hottest and complete combustion

Solution

Question 6

The substances which vapourise during burning, do not give flames.

The substances which have very high ignition temperature are called inflammable substances.

When the matchstick is struck against the rubbing surface, some red phosphorous gets converted into white phosphorous.

The job of a fire extinguisher is to cut off the supply of carbon dioxide, and hence the fire is controlled.

Question 7

In the blue zone

Just above the tip of the primary flame

At the top of the outer core

Just above the inner core

Solution

Question 8

they are burnt to release energy and they cause air pollution.

they were formed from the buried remains of plants and tiny animals that lived hundreds of millions of years ago.

they are non renewable and will run out.

they are mixed with fossils to provide energy.

Solution

Question 9

(a) - (i), (b) - (ii), (c) - (iii)

(a) - (ii), (b) - (i), (c) - (iii)

(a) - (i), (b) - (iii), (c) - (ii)

(a) - (ii), (b) - (iii), (c) - (i)

Solution

Question 10

complete combustion

spontaneous combustion

slow combustion

none of these

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.