National Science Olympiad Forum By SOF Olympiad Trainer - Page 504

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8
a

Ans 2:

Class : Class 10
A

Ans 3:

Class : Class 7

Ans 4:

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 5:

Class : Class 8

Ans 6:

Class : Class 6
A

Ans 7:

Class : Class 6

Ans 8:

Class : Class 1

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
A

Ans 11:

Class : Class 9

Ans 12:

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 13:

Class : Class 3
A

Ans 14:

Class : Class 9

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
yes ,you are rightans is c

Ans 2:

Class : Class 10

Ans 3:

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

Ans 4:

Class : Class 5

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 4
How is it C

Ans 2:

Class : Class 4
how about B

Ans 3:

Class : Class 7
B is not correct as it is gravity that causes objects to fall on the ground

Ans 4:

Class : Class 7
B is not correct as it is gravity that causes objects to fall on the ground

Ans 5:

Class : Class 5
Yes how it can be C ?

Ans 6:

Class : Class 8

Ans 7:

Class : Class 9

Ans 8:

Class : Class 7
frictional force is answer prevents from slipping

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Subject :NSO    Class : Class 4

Ans 1:

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

Ans 2:

Class : Class 5

Ans 3:

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 4:

Class : Class 4
But no spider species have 6 legs

Ans 5:

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

Ans 6:

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 7:

Class : Class 4
But no spider species have 6 legs

Ans 8:

Class : Class 5
questio is wrong

Ans 9:

Class : Class 5

Ans 10:

Class : Class 5

Ans 11:

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

Ans 12:

Class : Class 4
Thank you for the explanation

Ans 13:

Class : Class 5
confusing question

Ans 14:

Class : Class 4
Most off your questions are wrong

Ans 15:

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

Ans 16:

Class : Class 4
Keanna you are a copycat

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Subject :NSO    Class : Class 4

Ans 1:

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

Ans 2:

Class : Class 5

Ans 3:

Class : Class 5
kn

Ans 4:

Class : Class 5
kn

Ans 5:

Class : Class 4
ans is b

Ans 6:

Class : Class 5
wth

Ans 7:

Class : Class 5
kn

Ans 8:

Class : Class 5
kn

Ans 9:

Class : Class 5
kn

Ans 10:

Class : Class 2
please explain the reasoning

Ans 11:

Class : Class 4

Ans 12:

Class : Class 5
I did it with a guess and got it right somehow!

Ans 13:

Class : Class 4
The ans is A

Ans 14:

Class : Class 4

Ans 15:

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 16:

Class : Class 5
kn

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
D

Ans 2:

Class : Class 3
is it option C ?

Ans 3:

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.

Ans 4:

Class : Class 9
d

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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 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 2:

Class : Class 3

Ans 3:

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

Ans 4:

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

Ans 5:

Class : Class 6

Ans 6:

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

Ans 7:

Class : Class 8

Ans 8:

Class : Class 5
SOF, Isnt the answer C?

Ans 9:

Class : Class 5

Ans 10:

Class : Class 5
isn't the answer c

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
D

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