National Science Olympiad Forum By SOF Olympiad Trainer - Page 340

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Subject :NSO    Class : Class 7

Ans 1:

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 2:

Class : Class 5

Ans 3:

Class : Class 7
a

Ans 4:

Class : Class 9

Ans 5:

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.)

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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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Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Class : Class 1

D

There two 'S' in the word 'COSMOS' so, 'COSMOS' cannot be made from the given word.


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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 7
I think that he/she is.

Ans 2:

Class : Class 5
SCISSORS ARE : WEDGE, SCREW

Ans 3:

Class : Class 8

Ans 4:

Class : Class 7
Well, why don't they teach all this stuff in the synopsis?!They should, but, Admin from revisewise is correct.

Ans 5:

Class : Class 2
The person called admin is correct

Ans 6:

Class : Class 7
What are first class levers and second class levers?

Ans 7:

Class : Class 7

Ans 8:

Class : Class 9
Admin is correct

Ans 9: (Master Answer)

Class : Class 1

B

Tweezers are third class lever whereas see-saw, crowbar and scissors are first class levers.


Ans 10:

Class : Class 5
snow white are you too selected this year 2020-2021

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Subject :NSO    Class : Class 5

Ans 1: (Master Answer)

Class : Class 1

B

 Embankment is built on the banks of the river. It stops the water of the river from flooding the fields.


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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 10
plastic is a bad conductor then it would be C

Ans 2:

Class : Class 9
I agree with Srijan Anand !!!

Ans 3:

Class : Class 7
Plastic is not a good conductor of heat. So how should the answer be A?

Ans 4:

Class : Class 9
True plastic is a BAD CONDUCTOR but it’s not an INSULATOR right? So possibly it would naturally take some time .

Ans 5:

Class : Class 10
I agree.

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

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