National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 2

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Subject :NSO    Class : Class 2

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Subject :NSO    Class : Class 2

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Class : Class 1
hi

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 5

Which property of air make drinking through straw possible?

AAir has mass.
BAir occupies space.
CAir exerts pressure.
DAir can be compressed.


The straw is not empty; there is air inside the straw.When we dip the straw in any liquid and suck on one end of the straw, we are sucking the air out of the straw (it goes into our mouth). Now the atmosphere is pushing down on the liquid in the glass, so the liquid rises into the straw from the other end, and goes into our mouth.If we do not suck on the straw, the liquid will not rise in the straw. That means the air inside the straw is applying pressure on the liquid and not letting it rise.That means Option C is the right answer – Air exerts pressure.

Ans 1:

Class : Class 5
The straw is not empty; there is air inside the straw.When we dip the straw in any liquid and suck on one end of the straw, we are sucking the air out of the straw (it goes into our mouth). Now the atmosphere is pushing down on the liquid in the glass, so the liquid rises into the straw from the other end, and goes into our mouth.If we do not suck on the straw, the liquid will not rise in the straw. That means the air inside the straw is applying pressure on the liquid and not letting it rise.That means Option C is the right answer – Air exerts pressure.

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Subject :NSO    Class : Class 2

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 6

Kanika noticed that her potted plant was not growing healthily. She put few earthworms into the pot. After a few weeks, she noticed that her plants looked healthier. What could be the possible reason for this?

A The earthworms ate up the pests in the soil.
B The earthworms helped the plant to take in water.
C The earthworms allowed the plant to make food faster.
D The earthworms increased the air and nutrient content of the soil.


both option A and D are correct as earthworms also eat the pests and increase the air and nutrient content of the soil as these are some of the main reasons why the earthworm is called the farmer's friend.

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Subject :NSO    Class : Class 2

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Subject :NSO    Class : Class 6

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