National Science Olympiad Forum By SOF Olympiad Trainer - Page 484

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
option b

Ans 2:

Class : Class 8

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 6
C

Ans 2:

Class : Class 6
C

Ans 3:

Class : Class 9
A IS THE ANSWER

Ans 4:

Class : Class 4
A

Ans 5:

Class : Class 4
why it is A when a ice melts it gets hot but the water stays cool

Ans 6:

Class : Class 10
C

Ans 7:

Class : Class 5
answer is a because when the ice melts it becomes warmer and changes into liqiud

Ans 8:

Class : Class 4
A

Ans 9:

Class : Class 10
option A

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
A

Ans 2:

Class : Class 9
The correct answer is A

Ans 3:

Class : Class 9
The correct answer is A only.

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 7
I'm not sure what the answer is in this one, as the correct answer and the solution are mismatched.

Ans 2:

Class : Class 8

Ans 3:

Class : Class 8
It should be A...

Ans 4:

Class : Class 8

Ans 5:

Class : Class 9

Ans 6:

Class : Class 8
The *solution* and the *option* mismatch.

Ans 7:

Class : Class 8
According to Faraday's right hand rule, electricity flowing from point A to B generates a magnetic field around the wire moving from right to left (above the wire), and left to right (below the wire). Due to the compass being above the wire (according to the question), the compass needle must be influenced by the magnetic field, such that it points towards the right; i.e. the needle points in a direction from left to right. Thus, I opine that option (A) is the correct answer, not option (D). As there is an electric current, there must be a magnetic field, and thus there must be a deflection in the compass, which excludes option (D) entirely.

Ans 8:

Class : Class 9

Ans 9:

Class : Class 10
The answer is Option A

Ans 10:

Class : Class 10

Ans 11:

Class : Class 8
The solution says that the answer is supposed to be d but according to the explanation given the answer seems to be a. Please explain.

Ans 12:

Class : Class 8
should be a

Ans 13:

Class : Class 8
It’s A . The question uses Maxwell’s right thumb rule.

Ans 14:

Class : Class 8

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Answer is option a as decomposition of dead matter of plant and animal by animals which gives nutrients to plants

Ans 2:

Class : Class 9
this question did not come in the question paper,when i was solving

Ans 3:

Class : Class 7
this q didnt come

Ans 4:

Class : Class 7
this question did not come in the question paper,when i was solving

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
C

Ans 2:

Class : Class 3

Ans 3:

Class : Class 8
answer is c

Ans 4:

Class : Class 6
B

Ans 5:

Class : Class 3
D

Ans 6:

Class : Class 5
c

Ans 7:

Class : Class 4
nice question

Ans 8:

Class : Class 1
answer is c but it is saying b which is wrong

Ans 9:

Class : Class 4
answers to all the questions:::: 1 : B 2: B 3:A 4:D 5:B

Ans 10:

Class : Class 3
D - Because increase in plant also increases population of Caterpiler and Grasshopper, and decrease in snake may constant Bulbul population if plant did not increases.

Ans 11:

Class : Class 7
B first look which animals are connected to Bulbul with an arrow find their population then find population of other animals answer - B

Ans 12:

Class : Class 7

Ans 13:

Class : Class 4
Wrong

Ans 14:

Class : Class 5
class: 3 this doesent make sense

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
I agree with Ira not with Arnav because pulley does not lessen the effort.

Ans 2:

Class : Class 10
Single pulley does not provide any mechanical advantage, it only changes the direction of force while an inclined plane provides mechanical advantage. This means the efforts required to life the same amount of load on an inclined plane is lesser than that by a single pulley. (Pulley provides mechanical advantage only if we use more than one pulley).Lesser the inclination more is mechanical advantage and lesser the effort. That means the correct answer should be 'D'

Ans 3:

Class : Class 9
B

Ans 4:

Class : Class 6
d

Ans 5:

Class : Class 9
B

Ans 6:

Class : Class 5
B because if we use a rope to pull it will take a lot of effort, if we take a small or large inclined plane it will also take more effort because the load will slip down but in pulley we have to only pull the rope

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
The answer is option c

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