Class-5 EVS, Chapter-15, Blow Hot, Blow Cold, Additional Exercises with Solutions / NCERT


Chapter- 15
Blow Hot, Blow Cold

State True or False:
1-    Seeing the tiny person, the woodcutter was amazed and amused.    True
2-    Woodcutter was blowing his hands to freeze them.                               False
3-    Woodcutter blew on the fire to help it burn.                                            True
4-    Woodcutter blew- foo foo to burn potatoes.                                            False
5-    A doctor uses a stethoscope to listen to your chest.                             True

Fill in the blanks:
1-    Our heart beats faster after a run.
2-    When we blow air out, our chest comes in.
3-    Cold air is heavy and comes down.
4-    Taking and releasing air in through nose is called breathing.

Match the column:
Column A
Column B
Breathing rate increases with
air
Flute and Been are
cooler than hot tea.
Popcorn seller fans the burning coal
musical instruments in which we blow to produce sound
Our breath is
physical activity
We breath in
to increase air supply

Ans
Column A
Column B
Breathing rate increases with
physical activity
Flute and Been are
musical instruments in which we blow to produce sound
Popcorn seller fans the burning coal
to increase air supply
Our breath is
cooler than hot tea.
We breath in
air

Answer these questions:  Click here for Grade-6 Science
1-    How do you cool some food, when it is too hot?
Ans- When a food is too hot, we cool it in following ways:
a-    Blowing air with mouth.
b-    Pouring it in broader vessel
c-    Leaving it under the fan for sometime.

2-    If you were to cool these three hot things- dal, roti, rice- In which ways would you do so?
Ans- We will cool dal, roti and rice in following ways:
a-    Dal- Pouring in broader plate or bowl.
b-    Roti- Blowing the bytes with mouth.
c-    Rice- Spreading in plate.

Click for Hindi (रिमझिम )-5 

Click here for English (Marigold)-5 

3-    Mini tried to cool her tea by blowing on it. Which do you think will be hotter- Mini’s tea or the air she blew from her mouth.
Ans- Mini tried to cool her tea by blowing on it. Tea will be hotter than the air she blew from her mouth.

4-    Sonu was feeling very cold. He kept blowing on to his hands. Now think and write, which will be cooler- Sonu’s hands or his breadth?
Ans- Sonu was feeling very cold. He kept blowing on to his hands as his hands were cooler than his breadth.

5-    You must have seen someone blowing on their spectacles to wipe them clean. How does the air from mouth help in cleaning the spectacles?
Ans- Some people blow on their spectacles to wipe them clean. Air we blow from mouth is wet and helps in cleaning the glass.

6-    Why does a mirror become hazy on blowing air from mouth?
Ans- Air from our mouth is wet and tiny water droplets in it make the mirror hazy on blowing air from mouth.

Collect the pictures of musical instruments in which wind is blown:






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