Fuel

Q.

What are the products obtained after the combustion of methane called?

Q.

How come coal a biotic resource?

Q.

Why CNG is considered a better fuel than diesel for automobiles?

Q. Can fossil fuel be prepared in the laboratory? Justify your answer.

Q.

Write some important uses of the various constituents of petroleum.

Q. Of the two which one is better - coke or coal ? why ?

Q. People usually keep Angethi/burning coal in their closed rooms during the winter season. Why is it advised to keep the door open?​

Q. The substance which is expected to have the highest ignition temperature out of the following is​

1. coal​
2. kerosene
3. petrol
4. alcohol

Q.

Is Gasoline an Intermediate Good?

Q. More care is needed to store kerosene than coal.why?

Q.

Give two examples each of : (a) solid fuels (b) liquid fuels, and (c) gaseous fuels.

Q. The table below shows the ignition temperatures of four solid fuels.
$$\begin{array}{cc}\text{Fuels}& \text{Temperature (}{}^{\circ }\text{C)}\\ \text{P}& \text{300}\\ \text{Q}& \text{55}\\ \text{R}& \text{130}\\ \text{S}& \text{500}\end{array}$$

Based on the given information, identify the solid fuel that will catch fire easily.

1. P
2. Q
3. R
4. S

Q.

(a) What are fuels ? Name any two common fuels.

(b) State any four characteristics of an ideal fuel (or good fuel).

Q.

Heat energy obtained from the earth is called ________.

Q.

Explain briefly :

Gaseous fuels are preferred to solid and liquid fuels.

Q.

Why are all combustible substances not considered fuels?

Q.

We say fossil fuels will last only for a few hundred years. Comment.

Q.

The principal source of volatile organics (hydrocarbons) is

1. transportation

2. industrial processes

3. stationary fuel combustion

4. volcanoes

Q.

In which of the following cases gas is used in compressed form?

1. LPG as cooking gas

2. Oxygen cylinders used in hospitals

3. CNG used in vehicles

4. All of these

Q.

Give examples for liquid fuels. Why are liquid fuels better than solid fuels? [3 MARKS]

Q.

The energy available due to the difference in the temperature of water at the surface of the ocean and deeper level is called

1. Tidal energy

2. Ocean thermal energy ($OTE$)

3. Geothermal energy

4. None of these

Q. What is the unburnt material that is present in a fuel, e.g. wood?

1. Ash
2. Coal
3. Coke
4. Carbon

Q. The combustion efficiency increases with increased excess air - State true or false

1. True
2. False

Q. Question 5 (a)
State the following statement is True or False:
Fossil fuels can be made in the laboratory.

Q. Higher efficiency in the combustion of solid fuel cannot be achieved by

1. proper fuel preparation.
2. adopting efficient-fuel firing technique & equipment.
3. keeping the fuel gas exhaust temperature very high.
4. supplying correct quantity of combustion air.

Q. The ignition temperature of the petrol is ______${}^o\text{C}$.

1. 220

Q. Smoke is a result of complete combustion of a fuel.

1. True
2. False

Q.

Which of the following options can be correctly associated with fuels?

1. Fuel is the substance that undergoes combustion.

2. Fuel produces energy to be used for work.

3. Fuel may be solid, liquid or gas.

4. The substance which is highly infammable.

Q. Question 4 (a)
Fossil fuels are ___, ___ and ___.

Q. What is coke?