Quiz

Question: Kerosene oil catches fire at room temperature.
Options:
A.True
B.False
Answer: Option B
: B

The lowest temperature at which a substance catches fire is its ignition temperature. The ignition temperature of kerosene is about 600C. Hence, it does not catch fire by itself at room temperature.

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Question 1. Identify the appropriate category in which combustion can be categorised.
  1.    Physical process
  2.    Chemical process
  3.    Cyclic process
  4.    Biological process
Answer: Option B
: B

Combustion refers to the process where a substance burns in the presence of oxygen, giving off heat and light in the process.
The way to recognize a chemical change is to check whether a new substance is being created or not. During combustion, the fuel reacts with oxygen to form some new gases. So, a new substance is definitely formed. So, combustion is a chemical change.
Question 2. White phosphorus burns in air spontaneously.
  1.    True
  2.    False
  3.    it has a higher calorific value than wood.
  4.    it is a cleaner fuel than wood.
Answer: Option A
: A

White phosphorusis highly reactive and has a very low ignition temperature. It spontaneouslyignites at about 30 °C in air. So if the room temperature is more than30 °C, then it would catch fire.

It burns with awhiteflame producing clouds ofwhitesmoke.It is usually stored under water to prevent exposure to air.
Question 3. The picture below shows two cases in which a person is trying to burn the paper cup. In case 1, the cup has water in it and in case 2, it is empty and dry. Identify in which of the cases the paper will burn.

  1.    Case 1
  2.    Case 2
  3.    Both case 1 and case 2 
  4.    The paper doesn't burn in both the cases.
Answer: Option B
: B

In case 2, the empty paper cup reaches its ignition temperature and catches fire. In case 1, the heat supplied to the paper cup is transferred to water in it. So, in the presence of water, the ignition temperature of the paper is not reached. So, the paper would not burn in case 1.
Question 4. The suspended particles released by combustion of coal in air may lead to a health disease. Select the correct option.
  1.    Night Blindness
  2.    Asthma
  3.    Arthritis
  4.    Goitre
Answer: Option B
: B

Suspended particulate matter (SPM) refers tomicroscopic solid or liquid matter suspended in the Earth's atmosphere.Air pollutants consist of gaseous pollutants, odours, and SPM, (suspended particulate matter) such as dust, fumes, mist, and smoke. The high concentration of these in and nearurban areas causes severe pollution to the surroundings.High amount of SPM in airleads to respiratory problems andlung related diseases like asthma.
Question 5. Smoke in a flame is due to the presence of carbon content in the fuel.
  1.    True
  2.    False
  3.    High calorific value
  4.    Fire extinguisher
Answer: Option B
: B

Whenever there is some unburnt residue in the product gases, the particles diffuse light passing through them and we see it as smoke.

If oxygen supply is limited, it will result in unburnt suspended particles in product gases which do not get oxygen to react with. And when there are non-inflammable impurities, they too will not burn and will result in ash or suspended particles.
Question 6. Given below is a sign that is seen on a box at a petrol filling station. What does this sign indicate?


 
  1.    Non-combustible substance
  2.    Inflammable substance
  3.    High calorific value
  4.    Fire extinguisher
Answer: Option B
: B

The given picture is a warning signal indicating that the substance kept inside thebox is a inflammable substance. Substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, diesel, LPG, etc.

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