National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 3
The correct answer is c

Ans 2:

Class : Class 4
In the given food chain, tadpole feeds on water insect and in turn is eaten by small fish. If population of tadpole will decline with time then small fish population will also decrease as former is the food of later. On the other hand, water insect population will be positively affected because in the absence of predator prey population reproduces and flourishes.

Ans 3:

Class : Class 4

Ans 4:

Class : Class 6
The correct answer is C because if organism X wipes out all tadpoles in the community, then water insects' population grows with nothing to eat them. The small fish die because they have nothing to eat, and soon the big fish die too.

Ans 5:

Class : Class 4
C

Ans 6:

Class : Class 4
the correct answer is C

Ans 7:

Class : Class 4
correct answer is C

Ans 8:

Class : Class 7
Aarush , there will be not enough plants to feed so many water insects . So, at a particular time all plants will finish . So , there will be nothing left for the water insects so they will also die !

Ans 9: (Master Answer)

Class : Class 1
The correct answer is C.

Ans 10:

Class : Class 4

Post Your Answer

Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
A

Ans 2:

Class : Class 3
We Don't know that plants breath oxygen in night

Ans 3:

Class : Class 4
Sorry ,answer is A .I gave wrong explanation why .You have told arerespectively, so gas 1 is carbon dioxide and gas 2 is oxygen.You have given the order as 1 and 2 i.e. carbon dioxide and oxygen.So ,we will say it as 2 and 1 i.e oxygen and carbon dioxide .Hence answer is A.

Ans 4:

Class : Class 3
Answer is D because at night plants take in oxygen and give out carbon-di-oxide whereas we humans always take in oxygen and give out carbon-di-oxide.

Ans 5:

Class : Class 5
A

Ans 6:

Class : Class 4
ans is A as the order of gases will not change

Ans 7:

Class : Class 5

Post Your Answer

Subject :NSO    Class : Class 3

Ans 1:

Class : Class 5
The images given in Options A, B and D are symmetrical images. That means all three have at least one line of symmetry. Line of symmetry is any line drawn through the image which divides the image into two exactly equal parts, and these parts are mirror images of each other. A.The part above the red line (line of symmetry) and the 7part below the red line are mirror images of each other.7410`1 B.The parts on both sides of the red line (line of symmetry) are mirror images of each other. C.There can be no line of symmetry that can divide this image into two equal parts which are mirror images of each other. D.The part on the left side of the red line (line of symmetry) and the part on the right side of the red line are mirror images of each other. Hence, Option C is the odd one out.

Ans 2:

Class : Class 5
ANS should be a

Ans 3:

Class : Class 6
why?

Ans 4:

Class : Class 5
why

Ans 5:

Class : Class 8

Ans 6:

Class : Class 3
i cant understand the second question c] or b]?

Ans 7:

Class : Class 5

Ans 8:

Class : Class 3

Ans 9:

Class : Class 3
understood

Ans 10:

Class : Class 3

Ans 11:

Class : Class 3
nonsense question

Ans 12:

Class : Class 3
Answer is asymmetrical figure, because all the other figures are symmetrical.

Ans 13:

Class : Class 4
Figure A can be folded horizontally, figure B can be folded diagonally, figure D can be folded vertically to get their mirror images whereas figure C is asymmetric, so the odd one out is figure C

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
C

Ans 2:

Class : Class 4

Ans 3:

Class : Class 5
DDDDDDDDDDDDDD

Ans 4:

Class : Class 4
correct answer is C

Ans 5:

Class : Class 4
d

Ans 6:

Class : Class 5
C

Ans 7:

Class : Class 5
C

Ans 8:

Class : Class 7
The answer is C

Ans 9: (Master Answer)

Class : Class 1
The correct answer is C.

Ans 10:

Class : Class 5
how do you all know the correct answer is 'C' when everything seems correct.

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
correct answer is supposed to be C. But according to SOF it is A.

Ans 2:

Class : Class 2
Answer a

Ans 3:

Class : Class 4
iojkbn

Ans 4:

Class : Class 5
but read the question... you have to select the incorrect ans

Ans 5:

Class : Class 5
its a

Ans 6:

Class : Class 7
I did it c but according to SOF, it is a.

Ans 7:

Class : Class 6
c

Ans 8:

Class : Class 5
The question is asking to select the incorrect question, but option C is correct and option A is wrong so A is the correct answer

Ans 9:

Class : Class 4
cool question

Ans 10:

Class : Class 5
OH mene to d kiya tab laga ki sab wrong the.oh my god now acinfusing yar

Ans 11:

Class : Class 7
But a is the answer .

Ans 12:

Class : Class 7

Ans 13:

Class : Class 4
D

Ans 14:

Class : Class 7

Ans 15:

Class : Class 5
Yes, it is true, we can compare the movement to the joint mentioned as "P" with that of a joystick. It is a ball-socket joint, and it is found in the shoulders and the hips.

Ans 16:

Class : Class 6
SOF is wrong . The answer should be C as Ball and socket joint is only found in arms and legs . It cannot come in the skull . Smita De is also absolutely right .

Ans 17:

Class : Class 5
actually the picture P is wrong . they want to express it as pivot joint.

Ans 18:

Class : Class 1
The correct ans is A.

Ans 19:

Class : Class 5
Soumya raj is correct answer should be c as ball and socket joint is only found in legs and arms and it is definitely not found in the skull .

Ans 20:

Class : Class 5
The correct answer is A) according to SOF

Ans 21:

Class : Class 7
I think the answer is A

Ans 22:

Class : Class 6

Ans 23:

Class : Class 7
It's simple

Ans 24:

Class : Class 8
The correct answer is a but i did it wrong... (i did ans C)

Ans 25:

Class : Class 6
All of them are incorrect so the answer is D

Ans 26:

Class : Class 5
the answer is a but i did it c

Ans 27:

Class : Class 4
good question sligjhtly tricky

Ans 28:

Class : Class 6
Soumya raj is correct

Ans 29:

Class : Class 4
p is not pivot joint but a ball and socket joint but according to me c is the correct ans

Ans 30:

Class : Class 5

Ans 31:

Class : Class 6
EASY. It is a). FOund it very quickly. I wonder why many of you put c)

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 7
It would be conducted on either 9th or 23rd November. Ask your school Olympiad Coordinator.

Ans 2:

Class : Class 7
It would be conducted on either 9th or 23rd November. Ask your school Olympiad Coordinator.

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
base turns yellow with methyl orange.

Ans 2:

Class : Class 9
I think the answer is C. If it contains H+ ions less than OH- ions, the substance is a base.

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
d

Ans 2:

Class : Class 5
ANSWER IS D

Ans 3:

Class : Class 5
C

Ans 4:

Class : Class 5
answer is C

Ans 5:

Class : Class 6
Option DThe film of soapy water will burst as the water will get evaporated........

Ans 6:

Class : Class 5
a b c d e f g h i j k l m n o p q r s t u v w x y z.......... Confusing .......... z y x w v u t s r q p o n m l k j i h g f e d c b a

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

Ans 2:

Class : Class 4

Ans 3:

Class : Class 4

Ans 4:

Class : Class 5

Ans 5:

Class : Class 7

Ans 6:

Class : Class 6
They were trying to show the mirror image but OptionA is not shown correctly as the mirror image. Hence the confusion. between A and D.

Ans 7:

Class : Class 4
A IS NOT A MIRROR IMAGE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 8:

Class : Class 4
a

Ans 9:

Class : Class 4

Ans 10:

Class : Class 5
A is almost a symmetrical figure

Ans 11:

Class : Class 4
aa

Ans 12:

Class : Class 3

Ans 13:

Class : Class 5
answer can be b

Ans 14: