CBSE Questions for Class 5 Evs Blow Hot Blow Cold Quiz 1 - MCQExams.com

When does our heartbeat become faster?
  • During sleeping
  • Running
  • Sitting
  • Eating
Name the instrument which is used to listen the heart beat.
  • Telescope
  • Stethoscope
  • Microscope
  • Barometer
Which gas is necessary for burning fire?
  • $$O_2$$
  • $$CO_2$$
  • $$NO_2$$
  • $$CO$$
In what direction paper snake move when air is hot?
  • Clockwise
  • Anti-clockwise
  • Up
  • Down
What will happen when air is blown on the mirror from the mouth?
  • The mirror will become yellow in colour
  • The mirror will become hazy
  • The mirror will look dirty with a lot of dust on it
  • None of the above
Name the instrument played by blowing air.
  • Been
  • Guitar
  • Sitar
  • All
The hot air we breathe out contains water vapours which turn into tiny droplets of water when it comes in contact with the colder glass of spectacles.
  • True
  • False
The air blown from the mouth is wet.
  • True
  • False
If the paper snake is moving in an anti-clockwise direction, in which direction is the air flowing?
  • Upwards
  • Downwards
  • Left
  • Right
What phenomenon is observed when air is blown into the cap of the pen?
  • Light is produced.
  • Sound is produced.
  • Heat is produced.
  • Chemical energy is produced.
How do you cool food when it is too hot to consume?
  • Put in refrigerator
  • Put it in a microwave
  • Keep it in a broad container and blow air over it
  • Add sugar to it
Mini tried to cool her tea by blowing on it. Which of the following do you think will be hotter ?
  • Mini's tea
  • The air she blew from her mouth
  • The atmospheric air
  • None of these
In what direction paper snake move when air is cold?
  • Clockwise
  • Anti-clockwise
  • Up
  • Down
If the paper snake is moving in clockwise direction, in which direction is the air flowing ?
  • Upwards
  • Downwards
  • Right
  • Left
Identify the instance when blowing air from the mouth helps to cool things up ?
  • Blowing over hands on a cold day
  • Blowing over leaves fallen on ground
  • Blowing over coffee
  • Blowing over sharpener fillings
Identify the instance when blowing air from the mouth helps to warm things up ?
  • Blowing over tea
  • Blowing over hands after rubbing them on a snowy day
  • Blowing over rubber particles after using an eraser
  • Blowing over spectacles
Sonu was feeling very cold. He kept blowing on to his hands. Why did he do that ?
  • Sonu's breath was hotter than his skin (particularly on a cold day). By blowing, he transfer energy from inside his body to hands by convection.
  • Sonu's breath was cooler than his skin . By blowing out this cooler air out, Sonu felt warmer inside
  • Sonu's exhales out cool air and breathes in the air in the atmosphere which is relatively warmer and thus feels warm.
  • None of the above
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