National Science Olympiad Forum By SOF Olympiad Trainer - Page 483

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 8
After unscrambling the four jumbled words. We get, Sedimentation, Chlorination, Distillation and Filtration. Filtration and Sedimentation are methods of removing insoluble impurities. Distillation is the only option that is used to remove soluble impurities.

Ans 2:

Class : Class 4

Ans 3:

Class : Class 4

Ans 4:

Class : Class 6

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 10
option B

Ans 2:

Class : Class 8
i.e. 6 plus 7 = 13 and 9 plus 7 = 16 . SO, 8 plus 4 is 12.

Ans 3:

Class : Class 8
The pattern followed is 6 7=137 9=16So,8 4=12

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 9
i dont understand how ?

Ans 2:

Class : Class 7
Please explain

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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 10
C

Ans 2:

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

Ans 3:

Class : Class 4
A

Ans 4:

Class : Class 6
C

Ans 5:

Class : Class 9
A IS THE ANSWER

Ans 6:

Class : Class 6
C

Ans 7:

Class : Class 10
option A

Ans 8:

Class : Class 4
A

Ans 9:

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

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 9
The correct answer is A only.

Ans 2:

Class : Class 3
A

Ans 3:

Class : Class 9
The correct answer is A

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8

Ans 2:

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 3:

Class : Class 9

Ans 4:

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 5:

Class : Class 8

Ans 6:

Class : Class 8
should be a

Ans 7:

Class : Class 10
The answer is Option A

Ans 8:

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

Ans 9:

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

Ans 10:

Class : Class 8
It should be A...

Ans 11:

Class : Class 10

Ans 12:

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

Ans 13:

Class : Class 8

Ans 14:

Class : Class 9

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Subject :NSO    Class : Class 7

Ans 1:

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

Ans 2:

Class : Class 7
this q didnt come

Ans 3:

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

Ans 4:

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

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 7

Ans 2:

Class : Class 5
c

Ans 3:

Class : Class 4
Wrong

Ans 4:

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 5:

Class : Class 3
C

Ans 6:

Class : Class 3
D

Ans 7:

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

Ans 8:

Class : Class 5
class: 3 this doesent make sense

Ans 9:

Class : Class 8
answer is c

Ans 10:

Class : Class 6
B

Ans 11:

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 12:

Class : Class 3

Ans 13:

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

Ans 14:

Class : Class 4
nice question

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