National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Light is a form of energy which helps us to see

Ans 2:

Class : Class 8
Light is a form of energy which makes the things visible from which it is emitted or reflected or refracted. It travels at a speed of about 3*10^8 m/sec.

Ans 3:

Class : Class 9
Light is a form of energy.

Ans 4:

Class : Class 7
The natural phenomenon which makes things visible

Ans 5:

Class : Class 7
light is light

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Subject :NSO    Class : Class 9

Ans 1:

Class : Class 10
Potassium Ammonium Nitrate.

Ans 2:

Class : Class 10
PERMANENT ACCOUNT NUMBER --PAN

Ans 3:

Class : Class 9
Personal Area NETWORK- PAN

Ans 4:

Class : Class 9
public area network

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
When we mix vinegar with baking soda CO2 will be released

Ans 2:

Class : Class 9
CH3COOH+NaHCO3=CH#COONa+H20+CO2

Ans 3:

Class : Class 8
CH3COOH(acetic acid) + HCO3(hydrogen carbonate) ---------- NaC2H3O2(sodium acetate) +CO2

Ans 4:

Class : Class 8
if you mix acetic acid.....that is vinegar in hydrogen carbonate that is [again...;)] ....baking soda it releases carbon dioxide. It is used in mostly in flour doughs to give a rise as a substitute to yeast..............................................please like........

Ans 5:

Class : Class 9
DO IT PRACTICALLY U WILL GET

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
Mercury is used in thermometers becuase it expands easily and does not stick to the sides of the thermometer. Difference between clinical and lab thermometer- The range of clinical thermo.is between 35 degree celsius to 42degree celsius whereas the range of lab. thermo. is between -10degree celsius to 110degree celsius. CT are used to measure temp. of human body whereas LT is used to measure the temp. of objects other than the human body.

Ans 2:

Class : Class 10
Mercury is used in thermometers with a higher range, as its freezing and boiling points are -39c and 360c while alcohol is used in those needing to measure a lower range with -114c and 78c respectively.

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
ingestion : the process of taking in food through mouth opening digestion: is the process of breakdown of food into simple form with the help of digestive juices made in the body absorption: is the process by which food in the simple form passes into body fluids such as blood assimilation: is the process of using absorbed nutrients by the body cells for producing energy and for the growth of the body egestion: is the process of removing waste matter from the body.

Ans 2:

Class : Class 7
The four basic processes are- Ingestion Digestion Assimilation Excretion

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
Quantity of water in tank A= 5x Quantity of water in tank B= x Total quantity of water= 6x 6x=(45+45) litres 6x= 90 litres x=15 litres A=5X=75 LITRES, B=15 LITRES Quantity of water transfered from A to B=30

Ans 2:

Class : Class 8
The answer is 30 litres(a). Tank A: 45+30=75 Tank B:75/5=15 so the water transferred from Tank A to tank B so that each tank contains 45lit of water should be 30 litres [Tank A: 75-30=45; Tank B: 15+30=45]

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Subject :NSO    Class : Class 9

Ans 1:

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:

Class : Class 9
as hard water contains dissolved magnesium and calcium ions

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
HNO3 = NITRIC ACID H2SO4 = SULFURIC ACID

Ans 2:

Class : Class 7
HNO3 - NITRIC ACID H2S04- SULPHURIC ACID

Ans 3:

Class : Class 8
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 4:

Class : Class 9
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

Ans 5:

Class : Class 8
HNO3 is Nitric Acid H2SO4 is Sulphuric Acid

Ans 6:

Class : Class 9
HNO3 = Nitric Acid H2SO4 = Sulphuric acid

Ans 7:

Class : Class 7
hno3=nitricacid or aquafortis,h2so4=sulphuric acid or oil of vitriol or king of chemical compounds

Ans 8:

Class : Class 7
HNO3 - NITRIC ACID H2S04- SULPHURIC ACID

Ans 9:

Class : Class 9
HNO3=nitric acid H2SO4=sulphuric acid

Ans 10:

Class : Class 8
HNO3 - NITRIC ACID , H2SO4 - SULPHURIC ACID

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