Class 5 Exam > Class 5 Notes > EVS Class 5 > Worksheet: Blow Hot, Blow Cold - 1
Blow Hot, Blow Cold - 1 Class 5 Worksheet EVS Chapter 15
Q1: Fill in the Blanks.
(i) __________ air is light and rises up.
(ii) __________ air is heavy and comes down.
(iii) Our breath is __________ than hot tea and hence we blow air to cool tea.
(iv) We __________ our hands in winter by blowing on them when they are cold.
(v) The air blown from our mouth is __________ in cold winter.
(vi) The air we breathe out contains __________ which turns into drops of water when comes in contact with a cold surface.
(vii) The woodcutter kept blowing into his hands while cutting the wood because to __________ them.
(viii) A popcorn seller fans the burning coal to increase the __________ supply.
(ix) We use a __________ to listen to the sound of a heartbeat.
(x) Whenever the air flows __________ the paper snake will move in a clockwise direction.
Q2: Tick (✔) or Choose the Correct Answer.
(i) Suppose you are given hot khichdi to eat. How will cool down without blowing air from your mouth?
(a) By mixing cold water into it.
(b) By spreading it over the plate.
(c) By putting ice cubes into it.
(d) By spreading it over our palm.
(ii) Suppose you bang your head while playing and your forehead is swollen, a warmed handkerchief if put over it gives relief. Why is it so?
(a) Warm air kills germs on the injury.
(b) Handkerchief has medicine on it.
(c) Warm air soothes the skin giving relief.
(d) It is done to please children.
Q3: Short Answer Questions
(i) How does your breath help to warm your cold hands in winter?
(ii) Why do we blow at a burning fire?
(iii) Name any two musical instruments we blow air into produce sound.
(iv) Why do we blow on hot potatoes?
Q4: Long Answer Questions
(i) Why do people blow air on their spectacles before cleaning them?
(ii) Why do we see drops of water on your bathroom mirror, when you take a hot shower in winter?
You can find Worksheets Solutions here: Worksheet Solutions: Blow Hot, Blow Cold - 1
The document Blow Hot, Blow Cold - 1 Class 5 Worksheet EVS Chapter 15 is a part of the Class 5 Course EVS Class 5.
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FAQs on Blow Hot, Blow Cold - 1 Class 5 Worksheet EVS Chapter 15
| 1. What is the concept of "Blow Hot, Blow Cold"? |  |
Ans. "Blow Hot, Blow Cold" is a concept used to describe the behavior of air when it is heated or cooled. It refers to the movement of air particles and how they expand or contract depending on the temperature.
| 2. How does heating affect the movement of air particles? | |
Ans. When air is heated, the air particles gain energy and move faster. This causes the air to expand and become less dense. As a result, the heated air rises and creates a convection current.
| 3. What happens to air when it is cooled? | |
Ans. When air is cooled, the air particles lose energy and move slower. This causes the air to contract and become more dense. The cooled air then sinks, creating a convection current in the opposite direction of the heated air.
| 4. How does the concept of "Blow Hot, Blow Cold" relate to weather patterns? | |
Ans. The concept of "Blow Hot, Blow Cold" is closely related to weather patterns. It explains how the uneven heating of the Earth's surface leads to the formation of high and low-pressure systems, which in turn influence wind patterns and weather conditions.
| 5. Can you provide an example of "Blow Hot, Blow Cold" in everyday life? | |
Ans. Yes, a simple example of "Blow Hot, Blow Cold" in everyday life is the movement of air around a radiator or heater. When the heater is turned on, the air around it is heated and rises, creating a flow of warm air. Conversely, when the heater is turned off, the air cools down and sinks, creating a flow of cool air.
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