National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 8
Plants use sunlight, chlorophyll, carbondioxide and water to produce oxygen.When plants put them together a chemical reaction causes and oxygen is produced.

Ans 2:

Class : Class 7
Carbon Dioxide +Water (using sunlight and chlorophyll present in leaves)= starch+water vapour+ Oxygen =

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
Light is a form of energy.

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 7
The natural phenomenon which makes things visible

Ans 4:

Class : Class 7
light is light

Ans 5:

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

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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 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 3:

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

Ans 4:

Class : Class 9
DO IT PRACTICALLY U WILL GET

Ans 5:

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

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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 9
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
The four basic processes are- Ingestion Digestion Assimilation Excretion

Ans 2:

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.

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Subject :NSO    Class : Class 6

Ans 1:

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]

Ans 2:

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

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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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