National Science Olympiad Forum By SOF Olympiad Trainer - Page 338

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 6

Ans 2:

Class : Class 9
I did not understand

Ans 3:

Class : Class 9
But let's see for nowI am Kashish

Ans 4:

Class : Class 6
what is the unit of pressure

Ans 5:

Class : Class 8
Can anyone please explain this

Ans 6:

Class : Class 6

Ans 7:

Class : Class 9
I guess it is wrong

Ans 8:

Class : Class 10
Density of oil = 0.80 g/cc = 800 kg/m3Density of water = 1 g/cc = 1000 kg/m3Pressure of water = Height will be 1 m half filled⟹ hdg = 1m×1000kg/m3×10m/s2 = 10000 PaPressure by oil = hdg = 1 x 800 x 10 = 8000 PaTotal pressure = 8000Pa 10000Pa = 18000Pa = 1.8×104N/m2

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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.

Ans 1:

Class : Class 7
All options are wrong, it can't be A because cotton burns with smell of burning paper and similarly it can't be D because silk burns with an odour of charred meat.

Ans 2:

Class : Class 7

Ans 3:

Class : Class 7
tttt

Ans 4:

Class : Class 8
silk smells of charred meat . This was the answer given even in the chapterwise question bank

Ans 5:

Class : Class 9
It should be A

Ans 6:

Class : Class 7
Yes, The answer should be A and not D

Ans 7:

Class : Class 7
cotton-burning paperwool-burning hairsilk-charred meat

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
Isn't it option a ?

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 1

Ans 2:

Class : Class 6
can also be option B right?

Ans 3:

Class : Class 2
magnet y should attract towards magnet z cause they both have the same pole facing towards each other

Ans 4:

Class : Class 9
correct answer : D

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8
Current flows from positive terminal to negative terminal.... so the bulbs will glow simultaneously

Ans 2:

Class : Class 8

Ans 3:

Class : Class 8
D is correct

Ans 4:

Class : Class 7

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 6
why??????????????

Ans 2:

Class : Class 6

Ans 3:

Class : Class 6

Ans 4:

Class : Class 8

Ans 5:

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

Ans 6:

Class : Class 6

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 6

Ans 2:

Class : Class 6

Ans 3:

Class : Class 9
Correct answer is D

Ans 4:

Class : Class 8
No the answer is 200 as the car is having a uniform acceleration of 1m/s^2.So, according to the formula s=ut 1/2at^2, the distance covered (s) = 0 1/2at^2=1/2x1x400=200m.

Ans 5:

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

Ans 6:

Class : Class 8
No the answer is 200 as the car is having a uniform acceleration of 1m/s².So, according to the formula s=ut 1/2at², the distance covered (s) = 0 1/2at²=1/2x1x400=200m.

Ans 7:

Class : Class 6
why????????????????

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
I think it is none of these

Ans 2:

Class : Class 8
I think the answer is A

Ans 3:

Class : Class 7
the answer is b if you have a doubt check the synopsis of the chapter

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