National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
You have to specify if waxing or waning crescent

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
X will light up... I think it's incorrect....

Ans 2:

Class : Class 9

Ans 3:

Class : Class 9
I too am confused as current will also flow through both the bulbs when circuit is closed. It will pass through the switch first and hence lighting up bulb Y.

Ans 4:

Class : Class 2
Option D is correct because current prefers the path that offers less resistance. The bulb provides resistance whereas the switch when closed does not. Hence correct answer is D

Ans 5:

Class : Class 8
The answer key says that X will not light up,but why?

Ans 6:

Class : Class 8
The answer is B

Ans 7:

Class : Class 8
answer should be B

Ans 8:

Class : Class 6
The answer should be B as it will be closed circuit

Ans 9:

Class : Class 8
Please explain it. I am also confused about the answer. I myself did B.

Ans 10:

Class : Class 9
Yess,my answer was B also

Ans 11:

Class : Class 8
logically it should be B but sof says otherwise. why ????

Ans 12:

Class : Class 9
yes i too did B

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
The answer is c

Ans 2:

Class : Class 4
Low High Many Many

Ans 3:

Class : Class 5

Ans 4:

Class : Class 5

Ans 5:

Class : Class 5
Sorry , my brother changed the C into D . It should be C only !

Ans 6:

Class : Class 5

Ans 7:

Class : Class 3
D

Ans 8:

Class : Class 4
d

Ans 9:

Class : Class 5
It is a very serious thing for us that we are getting wrong answers from SOF . It should be D only !

Ans 10:

Class : Class 6
The answer is d

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

Ans 2:

Class : Class 5

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 4

Which of the following is NOT hidden in the given word grid?


AStructure present in polar bear that protects it from cold and a structure present in Scoliodon that enables it to breathe underwater.
BBehavioural adaptation that helps Siberian cranes to escape cold winters of their homeland and structural adaptation that helps them to fly.
CPhenomenon wherein chameleon blends with its surrounding by changing its skin colour to remain unnoticed by its prey.
D Phenomenon wherein a leaf insect externally resembles a plant leaf to remain unnoticed by its predator.


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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7

Ans 2:

Class : Class 7

Ans 3:

Class : Class 6
The correct and is D as the magnetic field moves from North to south

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7
GIVEN ANSWER IS NOT CORRECT AS A IS THE CORRECT ANSWER

Ans 2:

Class : Class 7
no because what will u do of zero u have to

Ans 3:

Class : Class 7
I think it should be C because otherwise the zero end can shift slightly (in our viewpoint) and measurement will be wrong. So both statements a and b are correct and the answer is C.

Ans 4:

Class : Class 7
No as it causes a parallax error. It should be option A. If you don't believe me then try it yourself with a scale and measuring a line segment from different eye positions. You will see that, the measurement varies slightly every time. That's why option A is correct.

Ans 5:

Class : Class 7

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 1

Ans 2:

Class : Class 7

Ans 3:

Class : Class 7
A as image is as far behind the mirror as Object is in front of it. In this case Sachin is 3 m in front of the mirror and the object seems to be seven meters ahead. As Sachin is 3 m in front of the mirror that means object is (7-3) = 4 m behind the mirror. As image is as far behind the mirror as Object is in front of it, It means chart is 4 meters in front of the mirror. ( 4 - 3 ) = 1 m behind Sachin as Sachin is also in front of the mirror. Hope that answers your question !

Ans 4:

Class : Class 1
A

Ans 5:

Class : Class 3
A

Ans 6:

Class : Class 6
A

Ans 7:

Class : Class 6
Sachin is being tested for his eyesight by an optician.Now, let’s read the given information carefully, and find out the position of Sachin.Sachin sits 3 m in front of a plane mirror, and looks at the image of the chart of letters, which seems to be 7 m in front of him.This means the distance between the mirror and the image of the chart is (7 m – 3 m = 4 m). If the image of the chart is 4 m behind the mirror, then the actual chart is placed 4 m in front of mirror.Now the chart is placed 4 m in front of the mirror, and Sachin is sitting 3 m in front of the mirror. That means the chart is placed (4 m – 3 m = 1 m) behind Sachin. Hence, the right answer is Option A.

Ans 8:

Class : Class 7

Ans 9:

Class : Class 6
Sachin is being tested for his eyesight by an optician.Now, let’s read the given information carefully, and find out the position of Sachin.Sachin sits 3 m in front of a plane mirror, and looks at the image of the chart of letters, which seems to be 7 m in front of him.This means the distance between the mirror and the image of the chart is (7 m – 3 m = 4 m). If the image of the chart is 4 m behind the mirror, then the actual chart is placed 4 m in front of mirror.Now the chart is placed 4 m in front of the mirror, and Sachin is sitting 3 m in front of the mirror. That means the chart is placed (4 m – 3 m = 1 m) behind Sachin. Hence, the right answer is Option A.

Ans 10:

Class : Class 7

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