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jayashimman from sboa, Chennai
Subject :NSO    Class : Class 9

Ans 1:

Pulkit from Aryaman Vikram Birla- Institute of Learning, Haldwani
Class : Class 9
permanent hardness of water means it cannot be converted again into its soft state without strong boiling as it contains Ca and Mg salts..

Ans 2:

Sarthak Praveen Modhe from St. Thomas Convent Sr. Sec. School, Bhopal
Class : Class 9
as hard water contains dissolved magnesium and calcium ions

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abhinav from fitjee world school, Hyderabad
Subject :NSO    Class : Class 6

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from ,
Subject :NSO    Class : Class 6

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hanish gowda from vidyaniketan public school, Bengaluru
Subject :NSO    Class : Class 7

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from ,
Class :
HNO3 = NITRIC ACID H2SO4 = SULFURIC ACID

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Ardhya Goyal from DPS Durg, Chattisgarh
Class : Class 7
HNO3 - NITRIC ACID H2S04- SULPHURIC ACID

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Nageswara Rao Rayala from new vison olmpiyad school, khammam,telangana
Class : Class 7
hno3=nitricacid or aquafortis,h2so4=sulphuric acid or oil of vitriol or king of chemical compounds

Ans 4:

from ,
Class :
hno3 i snitric acid a very strong acid indeed a monobasic acid h2so4 is sulphuric acid ph is 1.4 highly corrosive used in lead storage batteries hope u get

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from ,
Class :
HNO3 = Nitric Acid H2SO4 = Sulphuric acid

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from ,
Class :
HNO3 and H2SO4 are strong and artificially made acids called as Nitric acid and Sulphuric acid respectively. They are used in perfume making, cleansing of metal containers, etc. and they are also used in chemical reactions.

Ans 7:

from ,
Class :
HNO3=nitric acid H2SO4=sulphuric acid

Ans 8:

Ardhya Goyal from DPS Durg, Chattisgarh
Class : Class 7
HNO3 - NITRIC ACID H2S04- SULPHURIC ACID

Ans 9:

from ,
Class :
HNO3 is Nitric Acid H2SO4 is Sulphuric Acid

Ans 10:

from ,
Class :
HNO3 - NITRIC ACID , H2SO4 - SULPHURIC ACID

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from ,
Subject :NSO    Class : Class 3

Ans 1:

Adithya Bharath M from Manipal School, Mangalore
Class : Class 7
E-mail

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Shagun from MAXFORT DWARKA, New Delhi
Class : Class 5
telephone

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from ,
Class :
E-mail

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Shagun from MAXFORT DWARKA, New Delhi
Class : Class 5
Telephone

Ans 5:

Kirti Dwivedi from DR AMIN, Vadodara
Class : Class 5
A

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abhinav from fitjee world school, Hyderabad
Subject :NSO    Class : Class 6

Ans 1:

from ,
Class :
disulfuric acid

Ans 2:

abhinav from fitjee world school, Hyderabad
Class : Class 8
oleum=h2s2o7 or disulphuric acid or fuming sulphuric acid

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from ,
Subject :NSO    Class : Class 6

Ans 1:

A Andrew from Lalaji Memorial Omega International School, Chennai
Class : Class 8
The Juno mission to planet Jupiter .

Ans 2:

abhinav from fitjee world school, Hyderabad
Class : Class 8
JUNO mission to jupiter

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UVAIS ZUFAR from DON BOSCO SCHOOL OF EXCELLENCE, Chennai
Subject :NSO    Class : Class 5

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Soundharya from ISWK, Muscat
Class : Class 8
Trible people live in forests. Deforestation is the process of cutting down of trees in forests. This affects the survival of trible people as they get food from these trees and live in forests.

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from ,
Subject :NSO    Class : Class 3

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Adithya Bharath M from Manipal School, Mangalore
Class : Class 7
The Pole star

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Shubhra from Sandipani, Nagpur
Class : Class 3
Sun

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from ,
Class :
U Y Scoti

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Kirti Dwivedi from DR AMIN, Vadodara
Class : Class 5
Sun

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from ,
Subject :NSO    Class : Class 7

Ans 1:

from ,
Class :
The theory of relativity was proposed by Albert Einstein and determined that the laws of physics are the same for all non accelerating observers. He showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels.

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from ,
Class :
Theory of Relativity is a theory proposed by Albert Einstein relating mass, capacity and energy in the form of equation where E is energy, M is mass and C is capacity (E=MC^2).

Ans 3:

Gyanajyoti Mishra from J.N.V., Jajpur
Class : Class 10
Theory of relativity says us that E means energy and M where mass and C means velocity of light, in the equation E=MC^2

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