National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
baking powder is a type of powder used to make cakes,cookies and many more. vinegar is a type of liquid used to make cakes,cookies and other junk foods.they are also used to do experiment.

Ans 2:

Class : Class 7
CO 2 (Carbon dioxide)

Ans 3:

Class : Class 8
It gives softness to the food and too much in take is unhealthy.

Ans 4:

Class : Class 7
Baking Powder is a base.It is sodium hydroxide(NaOH). Vinegar is an acid.It is ascetic acid

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Acids are the chemicals which contain hydrogen ions and taste sour. They attain a pH value below 7 and are corrosive in nature. Bases are generally hydroxides, carbonates, bicarbonates or oxides of metals and bitter to taste. They attain a pH value above 7 and are soapy to touch.

Ans 2:

Class : Class 8
some materials like lemon and vinegar taste sour due to the presence of materials/ chemicals called acids. some materials like baking soda taste bitter due to the presence of chemicals / materials called bases.

Ans 3:

Class : Class 8
Acids are substance which are sour Bases are which are slippery/soapy to touch

Ans 4:

Class : Class 7
acid is a word which came from latin "acidus/acidum mean sour.bases are the substances which give bitter in taste.

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
MCB stands for Multiple Circuit Breaker

Ans 2:

Class : Class 6
miniature circuit breaker

Ans 3:

Class : Class 6
miniature circuit breaker

Ans 4:

Class : Class 6
MAIN COURSEBOOK,why?

Ans 5:

Class : Class 7
" Miniature Circuit Breaker " is the full form of MCB.

Ans 6:

Class : Class 8
Miniature Circuit Breaker

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 6
A COASTAL BREEZE WHICH BLOW FROM SEA TO THE LAND IS DURING THE DAY IS CALLED SEA BREEZE.A COASTAL BREEZE WHICH BLOWS FROM LAND TO SEA DURING THE NIGHT IS SES BREEZE.

Ans 2:

Class : Class 4
land gets heated faster than water does so when the hot air above the land rises up the cool air from the sea moves towards the land keeping that place cool is known as sea breeze. land breeze is mainly there at night.it keeps the sea cool.that wind comes from the land to the sea.

Ans 3:

Class : Class 4
land gets heated faster than water does so when the hot air above the land rises up the cool air from the sea moves towards the land keeping that place cool is known as sea breeze. land breeze is mainly there at night.it keeps the sea cool.that wind comes from the land to the sea.

Ans 4:

Class : Class 6
A COASTAL BREEZE WHICH BLOW FROM SEA TO THE LAND IS DURING THE DAY IS CALLED SEA BREEZE.A COASTAL BREEZE WHICH BLOWS FROM LAND TO SEA DURING THE NIGHT IS SES BREEZE.

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 7
During the day, land gets heated up much faster than the water in the sea .As the land becomes hot , it heats the air above it. this hot air rises up and the cool air from the sea blows towards the land to take its place . this wind that blows from the sea towards the land during the day is called the sea breeze . At night , the land cools down much faster than the sea which , in turn., cools the air above the land . The air above is still warmer . This warm air rises up and the cool air from the land rushes towards the sea to take its place .This wind that blows from the land towards the sea at night is called the land breeze .

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 3
neal river

Ans 2:

Class : Class 5
nile is the longest river in the world

Ans 3:

Class : Class 4
nile is the lonest river.

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
As an "ink remover" to remove ink off clothes.

Ans 2:

Class : Class 9
NH4OH is the chemical name of ammonium hydroxide.It is nitric acid.

Ans 3:

Class : Class 8
The uses of ammonium hydroxide are as follows - To manufacture fertilizers like ammonium sulphate To manufacture rayon, dyes, etc.

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
neutralisation is when an acid reacts with a base to form a salt and H2O and some heat is liberated galvanisation is when you add a layer of zinc upon iron so that it does not rust

Ans 2:

Class : Class 8
Neutralisation is the process of adding base to an acid whereas galvanisation is the process of coating a layer of zinc on iron.

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
the answer is - calcium carbonate

Ans 2:

Class : Class 8
caco3

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
potense of hydrogen or power of hydrogen is basically a test used to determine strengh of a acid or a base.

Ans 2:

Class : Class 8
It is the negative logarithm of H+ ions

Ans 3:

Class : Class 9
pH means power of hydrogen/ povouir hydrogen, means concentration of hydrogen ions in an aqueous solution.So it is used to identify whether a substance is acid,base or neutral.

Ans 4:

Class : Class 8
pavour hydrogine

Ans 5:

Class : Class 7
pH is a scale used to specify the acidity or basicity of an aqueous solution

Ans 6:

Class : Class 9
no full form available

Ans 7:

Class : Class 8
pH means power of hydrogen

Ans 8:

Class : Class 7
The full form is povouir hydrogene

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