National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 5

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Class : Class 6
humus

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Subject :NSO    Class : Class 8

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Class : Class 8
Can anyone please explain this

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Subject :NSO    Class : Class 7

Rahul gets an assignment to make a list of fabrics made of different fibres. He takes piece of fabric X and Y and burns them to identify the fibre. Fibre X burns with smell of burning plastic and fibre Y with smell of burning hair. Identify the fabrics X and Y.

             X                Y
ANylon          Cotton
BCotton          Silk
CWool            Polyester
DPolyester      Silk


Silk burns with the smell of charred meat, not burning hair.

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Class : Class 7
tttt

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Class : Class 7
silk smells of charred meat . This was the answer given even in the chapterwise question bank

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

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Class : Class 8
Isn't it option a ?

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

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Class : Class 5
Current flows from positive terminal to negative terminal.... so the bulbs will glow simultaneously

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Class : Class 5
D is correct

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Subject :NSO    Class : Class 8

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Class : Class 8
Because option a is correct as reaction takes place in all three beakersOption b is also correct as Mg is more reactive than Zn.Option c is also correct as Zn is more reactive than Ag.Option c is also correct because

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Class : Class 8

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Class : Class 3
why??????????????

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
Correct answer is D

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Class : Class 8
speed= distance/time20=x/20so,x or distance is 400m

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Class : Class 3
why????????????????

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