National Science Olympiad Forum By SOF Olympiad Trainer - Page 557

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
cccccccccccc

Ans 2:

Class : Class 10
GIVEN ANSWER IS NOT CORRECT AS A IS THE CORRECT ANSWER

Ans 3:

Class : Class 10

Ans 4:

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

Ans 5:

Class : Class 8
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 6:

Class : Class 6

Ans 7:

Class : Class 7
I agree with Aritroray the answer should be C

Ans 8:

Class : Class 8

Ans 9:

Class : Class 7
i think its C

Ans 10:

Class : Class 3
No guys. Human eye can't focus simultaneously on two points. To avoid parallax error , eye should be on the point of measurement to be taken.Hence given answer is correct in my view. You may comment.

Ans 11:

Class : Class 6
it is simple that while measuring, at first you eye must be vertically above 0

Ans 12:

Class : Class 6
the answer will be both a and b

Ans 13:

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 14:

Class : Class 6
this is basic 6th grade physics, you cannot always be measuring 0cm, so as to avoid parallax error your eye must be placed right above the scale, if you do not beleive me ask your science/physics teacher. Hence it is A.

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8

Ans 2:

Class : Class 3
A

Ans 3:

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 4:

Class : Class 1
A

Ans 5:

Class : Class 9

Ans 6:

Class : Class 9

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 6
A

Ans 9:

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 10:

Class : Class 1

Ans 11:

Class : Class 6

Ans 12:

Class : Class 10
A

Ans 13:

Class : Class 7

Ans 14:

Class : Class 8
a

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
yes ,you are rightans is c

Ans 2:

Class : Class 5
Ans is C potato is stem and sugar cane also stem

Ans 3:

Class : Class 10

Ans 4:

Class : Class 5

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 9

Ans 2:

Class : Class 8
frictional force is answer prevents from slipping

Ans 3:

Class : Class 8
B is not correct as it is gravity that causes objects to fall on the ground

Ans 4:

Class : Class 8

Ans 5:

Class : Class 4
how about B

Ans 6:

Class : Class 4
How is it C

Ans 7:

Class : Class 5
Yes how it can be C ?

Ans 8:

Class : Class 8
B is not correct as it is gravity that causes objects to fall on the ground

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5

Ans 2:

Class : Class 5

Ans 3:

Class : Class 6
But no spider species have 6 legs

Ans 4:

Class : Class 6
Please explain more nicely and Keanna thank you for explaining

Ans 5:

Class : Class 4
Thank you for the explanation

Ans 6:

Class : Class 4
Oh my! thanks for solving my problem .

Ans 7:

Class : Class 6
But no spider species have 6 legs

Ans 8:

Class : Class 5
confusing question

Ans 9:

Class : Class 5
questio is wrong

Ans 10:

Class : Class 5
There is written on option D that Q could have three pair of wing but the question is wrong.There should be written two pair instead of three pair.Two pair is written on solution.

Ans 11:

Class : Class 7
A. P could be cold-blooded animal whereas R could be warm-blooded animal. ----- Frog has backbone, lays eggs and is a cold-blooded animal. So, P can be a Frog. Humans have backbone and hair, and they are warm-blooded. So, R can be a Human Being. So, this statement is Correct.B. Q could be six-legged animal whereas R could be four-legged animal. ----- Spiders have six legs and they lay eggs. So, Q can be a Spider. Horses are four-legged animals. They have backbone and hair. So, R can be a Horse. So, this statement is Correct.C. R could breathe through lungs whereas S could breathe through spiracles. ----- Dogs breathe through lungs, they have backbone and hair. So, R could be a Dog. Cockroaches breathe through spiracles. They have backbone and lay eggs, but they have no hair. So, S can be a Cockroach. So, this statement is Incorrect.D. P could have a pair of wings whereas Q could have two pairs of wings. ----- Birds have a pair of wings. They have backbone and they lay eggs. So, P could be a Bird. Most insects have two pair of wings, and they lay eggs. So, Q could be an Insect. So, this statement is Correct.Hence, the right answer is Option C.

Ans 12:

Class : Class 4
The option D. is wrong. It mentions 3 pairs of wings whereas it should be 2 pairs of wings.

Ans 13:

Class : Class 4
Hey, some spider species have six legs, usually out of India. And the whole explanation is wrong.

Ans 14:

Class : Class 4
Keanna you are a copycat

Ans 15:

Class : Class 4
Most off your questions are wrong

Ans 16:

Class : Class 5

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 2
please explain the reasoning

Ans 2:

Class : Class 10
kn

Ans 3:

Class : Class 4

Ans 4:

Class : Class 10
kn

Ans 5:

Class : Class 5
ans is b

Ans 6:

Class : Class 5

Ans 7:

Class : Class 4
The ans is A

Ans 8:

Class : Class 10
kn

Ans 9:

Class : Class 4
Let’s study the given food-web carefully:The food-web is starting from P. So, P are plants (Producers). Q, T and U are eating these plants, so they are Herbivores (Primary Consumers). R are eating Q, and V are eating U, so they are Carnivores (Secondary Consumers). S are eating T as well as R

Ans 10:

Class : Class 10
kn

Ans 11:

Class : Class 10
wth

Ans 12:

Class : Class 7
OMG!How confusing!How did the others do it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 13:

Class : Class 10
kn

Ans 14:

Class : Class 6
I did it with a guess and got it right somehow!

Ans 15:

Class : Class 4

Ans 16:

Class : Class 10
kn

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 9
d

Ans 2:

Class : Class 3
is it option C ?

Ans 3:

Class : Class 3
how can answer by c? I think it should be d

Ans 4:

Class : Class 3
D

Ans 5:

Class : Class 3
Answer can be A also as Q can be duck and P can be penguin and both of them have webbed feet and penguins live in places like Antartica.

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 9
B

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 3

Ans 2:

Class : Class 8

Ans 3:

Class : Class 5
isn't the answer c

Ans 4:

Class : Class 6
Ans is C because like humans, plants also sweat. This is called transpiration.

Ans 5:

Class : Class 7
Why D?It should be option C .

Ans 6:

Class : Class 5
SOF, Isnt the answer C?

Ans 7:

Class : Class 7
C is the answer to this question because the leaves are uncovered

Ans 8:

Class : Class 6
Why will it be D? It should be C, because the Vaseline blocks the stomata of the leaves, and thus blocks the surface for transpiration, so water droplets will not appear on those leaves, but the uncovered leaves were not stained or covered with anything, so the transpiration process in those leaves should stay normal.

Ans 9:

Class : Class 5

Ans 10:

Class : Class 6

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