Types of Combustion

Q. Bursting of firecrackers is an example of an explosion.

1. True
2. False

Q.

When sufficient oxygen is not available, combustion of methane produces ______ gas and water.

1. carbon dioxide

2. carbon monoxide

3. hydrogen

4. nitrogen

Q. Observe the figure showing a kerosene lamp.

Which of the following is not formed during the combustion of kerosene?

1. Carbon dioxide
2. Heat energy
3. Hydrogen gas
4. Water vapour

Q.

Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?

Q. <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Describe the different types of combustion.

Q.

What do you mean by a flame?

Q. Match the column
Directions: Match Column – I with Column – II and select the correct answer using the codes given below the columns

$\begin{array}{cc}Column-I& Column-II\\ \text{A. Hottest zone of candle flame}& \text{P. No combustion zone}\\ \text{B. Dark zone of candle flame}& \text{Q. Zone of unburnt wax vapours}\\ \text{C. Yellow zone of candle flame}& \text{R. Non-luminious zone}\\ \text{D. Black innermost zone of candle flame}& \text{S. Incomplete combustion zone}\end{array}$

1. $A\to P,B\to Q,C\to R,D\to S$
2. $A\to S,B\to R,C\to Q,D\to P$
3. $A\to R,B\to P,C\to S,D\to Q$
4. $A\to Q,B\to P,C\to R,D\to S$

Q.

What do you mean by a flame?

Q. The explosion of fireworks is an example of __________ change.

1. reversible
2. natural
3. temporary
4. irreversible