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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
Solid

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Class : Class 2
Vacuum

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Class : Class 7
Sound cannot travel through VACUUM 'cause there are no air particles to transfer the vibrations. it can travel through SOLIDS,LIQUIDS and GASES. It travels the fastest in SOLIDS

Ans 4:

Class : Class 7
Vacuum

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Class : Class 7
Vacuum

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Class : Class 2
Water

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Class : Class 7
vacuum

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Class : Class 8
Hydrogen and Oxygen

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Class : Class 8
Vaccum

Ans 10:

Class : Class 7
Sound travels 4times faster in water than in air. So, air travels fastest in liquids

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 2
The distance travelled by light in one year

Ans 2:

Class : Class 7
A light-year is a unit of distance. It is the distance that light can travel in one year.

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
To avoid the chemical reaction with metal

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Class : Class 7
Because most acids will corrode the metal container

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Class : Class 2
because metals reacts with the acid and stored in them

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Class : Class 7
they are not stored in metallic containers as metallic containers react with acids

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Class : Class 7
Because acids corrode the surface of the metals but not of glass

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Class : Class 8
acid Croce metal only one acid is there which stored in plastic it is hydrofluoric acid

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
Looking

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Class : Class 5
touch hearing and looking.

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 4
Sunglasses protect us from the sun's rays.

Ans 2:

Class : Class 6
24 hours

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Class : Class 9
24 hours

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Class : Class 4
8

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Class : Class 6
8

Ans 6:

Class : Class 6
It protects us from the harmful rays of uv light from the sun

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