Sam was impressed by John's quick answer and asked him another question somewhat related to the previous question itself.
Sam: John, now that you know so much about air around us, can you tell us which components of air is harmful for living beings?
John: I am not exactly sure about this, Kenneth, please help me answer this.
Kenneth: Oh yes, I can surely help you answer this question.
What was Kenneth's answer?

Nitrogen and carbon dioxide

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Dust and smoke

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Dust and water vapour

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Smoke and water vapour

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Solution

The correct option is B
Dust and smoke

Dust and and smoke are the components of air that are harmful to living beings. Smoke and dust when inhaled with air causes respiratory problems. They are harmful to eyes and lungs. Some of the components of smoke are greenhouse gases such as carbon monoxide, which are one of the main reasons of global warming.

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Similar questions

John and Sam were soon joined by their common friend Kenneth. Kenneth got to know about the discussion John and Sam were having. He too wanted to share some of his knowledge about air and asked to join the conversation. Sam and John both welcomed him and started firing questions on him.

Sam: Kenneth, do you know about the composition of air?

Kenneth: Yes, I do! it is a mixture of gases, water vapour and dust particles.

Sam: Fine, can you tell us its composition?

Kenneth: Hmmm, I am not sure about that.

Sam: Okay, just tell us the major components of air.

So can you answer the last question that was asked to Kenneth?

Sam asked Kenneth 'Now that you know about the composition of air, can you tell us (Sam and John) why the composition of air varies from place to place?' Kenneth began to think as he had no answer for this question. But having developed a reasonable idea about air and its properties John was able to connect the dots and gave a quick and loud answer.

What was John's answer?

After Kenneth's reply, John came out confident and asked both of them (Sam and Kenneth)

John: Do you guys know about the most abundant gas in air?

Sam: Yes, I do!

Kenneth: Yes I do!

John: then tell me what the use of nitrogen is?

Sam: Nitrogen is used in protein synthesis.
Kenneth: Nitrogen is used in amino-acids that are used to manufacture proteins by living organisms.

Considering the two answers given by Sam and Kenneth, which one do you think is correct?

Now that they all knew so much about air, they shifted their discussion to a more specific topic; Oxygen. Sam being the eldest convinced both John and Kenneth that to talk about oxygen. Our life line!

Kenneth: Yes sure we should know more about oxygen.

John: Now I remember what Sam said, my teacher also said the same thing, that oxygen supports combustion.

Kenneth: That means oxygen supports burning.

Sam: Now this brings me to another question. Since we know that oxygen supports burning. There is so much oxygen present in air, why don't we all get burnt then?

Kenneth: Nitrogen is present in much larger quantity than oxygen in air around us and since nitrogen does not supports burning, it dilutes oxygen to an extent that it does not burn everything.

State whether Kenneth's answer is true or false.

After Kenneth's reply, John could remember that he had seen in movies that people cover themselves in blankets during fires. He asked Kenneth 'how would you explain this activity?' Is it true that blankets save us from fires? Can you give us a reason.

Kenneth: Yes blankets save us from fires. But I don't know the exact reason. Maybe Sam can help us.

John: Yes Sam you must be knowing this.

Sam: Yes, I know........................

Which of the following can be Sam's answer?

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