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from ,
Subject :NSO    Class : Class 7

Ans 1:

aryan from nand vidya niketan,
Class : Class 7
Vacuum

Ans 2:

Aavanthika.S.R from St Thomas Residential school (STRS) trivandrum kerala, Trivandrum
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 3:

Anu Sharma from DPS Noida, Noida
Class : Class 2
Vacuum

Ans 4:

Sambit Das from Calcutta Boys' School, Kolkata
Class : Class 7
Vacuum

Ans 5:

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

Ans 6:

from ,
Class :
Solid

Ans 7:

KRITHIGHA SHRI M P from KAMALA NIKETAN MONTESSORI SCHOOL, TRICHIRAPPALLI
Class : Class 8
Hydrogen and Oxygen

Ans 8:

Anu Sharma from DPS Noida, Noida
Class : Class 2
Water

Ans 9:

KRITHIGHA SHRI M P from KAMALA NIKETAN MONTESSORI SCHOOL, TRICHIRAPPALLI
Class : Class 8
Vaccum

Ans 10:

from ,
Class :
vacuum

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from ,
Subject :NSO    Class : Class 7

Ans 1:

Anu Sharma from DPS Noida, Noida
Class : Class 2
The distance travelled by light in one year

Ans 2:

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

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from ,
Subject :NSO    Class : Class 7

Ans 1:

KRITHIGHA SHRI M P from KAMALA NIKETAN MONTESSORI SCHOOL, TRICHIRAPPALLI
Class : Class 8
To avoid the chemical reaction with metal

Ans 2:

Anu Sharma from DPS Noida, Noida
Class : Class 2
because metals reacts with the acid and stored in them

Ans 3:

aryan from nand vidya niketan,
Class : Class 7
Because acids corrode the surface of the metals but not of glass

Ans 4:

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

Ans 5:

gaurang gupta from mount litra zee school, uttar pradesh
Class : Class 8
acid Croce metal only one acid is there which stored in plastic it is hydrofluoric acid

Ans 6:

from ,
Class :
Because most acids will corrode the metal container

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khushboo from DPS, New Delhi
Subject :NSO    Class : Class 3

Ans 1:

Sivanthili.sivaganesh from kamalaniketan , Trichy
Class : Class 3
Looking

Ans 2:

Shagun from MAXFORT DWARKA, New Delhi
Class : Class 5
touch hearing and looking.

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khushboo from DPS, New Delhi
Subject :NSO    Class : Class 6

Ans 1:

Vibha from DAV Public School New Panvel, Mumbai
Class : Class 6
8

Ans 2:

from ,
Class :
24 hours

Ans 3:

Aarya M Shah from Navrachana Vidyani Vidyalaya, Vadodara
Class : Class 4
Sunglasses protect us from the sun's rays.

Ans 4:

from ,
Class :
24 hours

Ans 5:

S.Mukunthan from D.A.V.Public School, Chennai
Class : Class 6
It protects us from the harmful rays of uv light from the sun

Ans 6:

Aarya M Shah from Navrachana Vidyani Vidyalaya, Vadodara
Class : Class 4
8

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khushboo from DPS, New Delhi
Subject :NSO    Class : Class 3

Ans 1:

Adithya Bharath M from Manipal School, Mangalore
Class : Class 7
there are 8 planets

Ans 2:

Sivanthili.sivaganesh from kamalaniketan , Trichy
Class : Class 3
Eight

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