Ignition Temp

Q. Question 5 (c)
Give reason.
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Q. what is a spontaneous combustion?

Q.

Define ignition temperature of a substance.

Q.

What is the difference between rapid combustion , spontaneous combustion and explosion?

Q.

How is a spontaneous combustion different from a rapid combustion. Explain the difference in detail. [5 MARKS]

Q. The minimum temperature at which a substance catches fire is called its temperature.

1. maximum
2. minimum
3. ignition
4. lower

Q. Kerosene oil catches fire at room temperature.

1. True
2. False

Q. Assertion : We can boil water in a paper cup.
Reason : Ignition temperature of paper lowers due to water.

1. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2. Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3. Assertion is incorrect but Reason is correct.
4. Assertion is correct but Reason is incorrect.

Q.

The minimum temperature to which a substance should be heated so that it starts burning is:

1. Flash Point

2. Ignition Temperature

3. Burning Temperature

4. Boiling Point

Q. Which of the following types of combustion takes place in sodium at room temperature ?

1. Rapid
2. Spontaneous
3. Explosion
4. Both rapid and spontanous

Q.

Which of the two has a lower ignition temperature : petrol or kerosene ?

Q.

White phosphorus burns in air spontaneously.

1. True

2. False

Q.

Can you burn a piece of wood by bringing a lighted matchstick near it ? Explain.

Q. Can the process of rusting be called combustion? Discuss.

Q.

Which of the following substances has the lowest ignition temperature ?

(a) kerosene

(b) spirit

(c) diesel

(d) mustard oil

Q.

Name two substances having low ignition temperatures and two having high ignition temperatures.

Q.

When coal burns in the air then

Q.

Why do you have to use paper or kerosene oil to start fire in wood or coal ?

Q.

What is ignition temperature? [2 MARKS]

Q. What is spontaneous combustion?

Q. What is ignition temperature?

Q.

Give reason for the following :

Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not

Q. What is the difference between ignition temperature and burning temperature?

Q. LPG is a better domestic fuel as compared to wood.

1. True
2. False

Q.

Ignition temperature of __________ is lower than that of wood.

Q.

A cold liquid poured on burns caused by hot objects is:

1. water

2. alcohol

3. milk

4. honey

Q.

Ignition temperature is the temperature above which the material cannot catch fire.

1. True
2. False

Q.

Benzene is an inflammable substance.

1. True
2. False

Q. Which of the following has lowest ignition temperature ?

1. LPG
2. Petrol
3. Coal
4. Kerosene

Q.

What do we understand by spontaneous combustion?

1. Ignites once fuel is combusted

2. Ignites instantaneously without external source

3. Huge activation energy required

4. None of the choices