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NCERT · Class 5 · EVS

Chapter 15: Blow Hot Blow Cold

Practice each question, then open the answer or worked solution.

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The clock inside you

2 questions
Q1Written answer

You have all heard the ‘tick tick’ of the clock. Have you seen a doctor using a stethoscope to listen to your chest? What do you think she hears? Where is the sound coming from? Is there a clock inside your chest that keeps ticking away?

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Worked solution

Answer: Yes, I have seen doctors using a stethoscope to listen to our chest. They hear the heartbeat. The sound of the heartbeat comes from the heart while it pumps blood to the other parts of the body. No, it’s not a clock to keep ticking away; it’s the heart which is beating.

Q2Written answer

Do you want to listen to your heartbeat? Take a rubber tube as long as the distance from your shoulder to your elbow. At one end of the tube, fix a funnel. Place the funnel on the left side of your chest. Put the other end of the tube to your ear. Listen carefully. Did you hear a dhak-dhak sound?

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Worked solution

Answer: Yes, I could hear the sound.