National Science Olympiad Forum By SOF Olympiad Trainer - Page 338

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Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Class : Class 1

C

Stone pebbles have spaces between them, which allow air and water to seep through and reach the roots. This will help the trees grow better.


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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 9
a and d are correct

Ans 2:

Class : Class 9
Firstly , ( Sugar and Water ) and Pebbles can be separated through Filtration Secondly , Sugar and Water can be separated by Evaporation So , the answer is Option (A)

Ans 3:

Class : Class 5
A and d are correct

Ans 4:

Class : Class 5
Sorry but for the explanation a and d are not correct because first we have to follow the filtration process to separate pebbles and then use evaporation process

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Subject :NSO    Class : Class 6

Ans 1: (Master Answer)

Class : Class 1

A


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Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Class : Class 1

B
Citrus fruits are excellent sources of vitamin C. They can prevent diseases like scurvy and also help in curing common cold.


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Subject :NSO    Class : Class 10

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 7

Ans 2: (Master Answer)

Class : Class 1

C

The animal shown here is polar bear. They have a fat layer under skin and a layer of fur over it to protect them from cold.


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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
The answer is Option C.. Because burning of candle is both physical and chemical change(melting of wax could be assumed as physical change and the burning of the thread can be assumed as chemical change.. Also, sublimation of wax also takes place and can be classified as physical change.)

Ans 2:

Class : Class 7
a

Ans 3:

Class : Class 9

Ans 4:

Class : Class 5
why isn't the answer a that cutting wood can be a physical change (dead tree) and a chemical change ( all chemical reactions have stopped )

Ans 5:

Class : Class 5

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 4

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