National Science Olympiad Forum By SOF Olympiad Trainer - Page 668

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8
you are fully mad ? 555

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 8
how is it mechanical ????????????

Ans 2:

Class : Class 7

Ans 3:

Class : Class 8
how is it mechanical?

Ans 4:

Class : Class 10
mechanical

Ans 5:

Class : Class 9
how is it mechanical force?

Ans 6:

Class : Class 5

Ans 7:

Class : Class 5
how???????????????????????????????????????????????????????????????????????????is mechanical?????????????????????????????????????????????????????????????????

Ans 8:

Class : Class 7
how??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

Ans 9:

Class : Class 5

Ans 10:

Class : Class 10
Mechanical force

Ans 11:

Class : Class 5
how?

Ans 12:

Class : Class 8

Ans 13:

Class : Class 3
c is correct

Ans 14:

Class : Class 6
It is frictional force

Ans 15:

Class : Class 5
how???

Ans 16:

Class : Class 7
It is option C

Ans 17:

Class : Class 6
actually it is contact force .But SOF is mad so it said the wrong answer but the correct answer is CONTACT FORCE

Ans 18:

Class : Class 10
mechanical

Ans 19:

Class : Class 4
answer D

Ans 20:

Class : Class 1
I did C frictional force but SOF says it is D mechanical force. How is it mechanical force?

Ans 21:

Class : Class 7
push and pull are examples of mechanical force

Ans 22:

Class : Class 9

Ans 23:

Class : Class 2

Ans 24:

Class : Class 5

Ans 25:

Class : Class 7
Mechanical force is the only correct answer .

Ans 26:

Class : Class 9
How is it mechanical? Please explain

Ans 27:

Class : Class 10
Mechanical Force

Ans 28:

Class : Class 7
the corect answer is C

Ans 29:

Class : Class 5

Ans 30:

Class : Class 8
How the answer is D . Mechanical force

Ans 31:

Class : Class 9
The answer given by SOF is wrong so they have not given the solution to this question.

Ans 32:

Class : Class 3
Can somebody explain why it is mechanical force ????

Ans 33:

Class : Class 8

Ans 34:

Class : Class 5
It is mechanical

Ans 35: (Master Answer)

Class : Class 1
Mechanical Force.

Ans 36:

Class : Class 5
How it is d???Shouldn't it be c

Ans 37:

Class : Class 10
mechanical

Ans 38:

Class : Class 5
I was about to get 10/10 this 1 made me lose it.

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Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Class : Class 1
The correct answer is D.

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Subject :NSO    Class : Class 5

The given graph shows the changes in the population of an insect found on a Jackfruit tree after four different sprayings of the same insecticide.

What conclusion can you draw from the graph?

A The insecticide had no effect on the insects at all.
B The insect population had become resistant to the insecticide.
C The insect population increased as the wrong type of insecticide was used.
D The insecticide helped to reduce the number of insects permanently.


Ans 1:

Class : Class 8
The pesticide is partially effective because there is a drop in population after each spraying. Hence, B CANNOT BE THE CORRECT ANSWER.

Ans 2:

Class : Class 7
it should be 'D' but SOF shows the graph is decreasing and increasing which is not possible. it is the wrong graph as this can't happen.

Ans 3: (Master Answer)

Class : Class 1

Ans 4:

Class : Class 9
Answer is B akenis withis ve

Ans 5:

Class : Class 8
C

Ans 6:

Class : Class 6
D

Ans 7:

Class : Class 8
it is d.sof posted wrong answer

Ans 8:

Class : Class 9
If b is the answer then why is the bar graph increasing day by day.😠

Ans 9:

Class : Class 5
IF B IS ANSWER THAN GRAPH SHOULD BE ALMOST UNIFORM.. THE GROWTH IS INCREASING AFTER 3RD-4TH SPRAYING

Ans 10:

Class : Class 5
wrong

Ans 11:

Class : Class 5
it is supposed to be D. the graph should be going down slowly and not increasing if the answer was B.

Ans 12:

Class : Class 4
b

Ans 13:

Class : Class 10
It is C because after the guy used the 3rd and 4th pesticide the insects started increasing

Ans 14:

Class : Class 8
D cannot be correct because it increased after 3rd and 4th spray

Ans 15:

Class : Class 5

Ans 16:

Class : Class 4
answer is b only because it is decreasing also

Ans 17:

Class : Class 4

Ans 18:

Class : Class 7
I think the right answer should be C as when the 3rd spray was conducted the pest started to increase hence right answer answer is CThank you for appreciating me

Ans 19:

Class : Class 7
B is answer because when it decreases it is their natural death, otherwise they have become resistant thats why it is decreasing then increasing and not uniform.

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 8

Ans 2:

Class : Class 3

Ans 3:

Class : Class 5
ANS B!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 4:

Class : Class 5

Ans 5:

Class : Class 10
A

Ans 6:

Class : Class 5

Ans 7:

Class : Class 8
(B) or (C)?

Ans 8:

Class : Class 5
A

Ans 9:

Class : Class 6

Ans 10:

Class : Class 4

Ans 11:

Class : Class 5

Ans 12:

Class : Class 8

Ans 13:

Class : Class 5

Ans 14:

Class : Class 7

Ans 15:

Class : Class 7

Ans 16:

Class : Class 7
B is the answer to this question

Ans 17:

Class : Class 7
It is "B". People who put "a" mixed up x

Ans 18:

Class : Class 8

Ans 19:

Class : Class 7

Ans 20:

Class : Class 6
Confusion between (B) and (C)

Ans 21:

Class : Class 9

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Subject :NSO    Class : Class 1

Ans 1:

Class : Class 10
C

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
I got the answer ........Its option (C) SPLEEN

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Subject :NSO    Class : Class 1

Ans 1:

Class : Class 8
manit d is the answer

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Options B and D are correct

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 10
D

Ans 2:

Class : Class 6
It is Xanthium which is dispersed by animals.

Ans 3:

Class : Class 5
The image looks nothing like cocklebur. It has to be a bit more clear,

Ans 4:

Class : Class 9
Its B

Ans 5:

Class : Class 9
it has hair like structure

Ans 6:

Class : Class 6
The correct answer should be B because it has a hairy structure and it can be dispersed by wind .nor its written that this is Xanthium

Ans 7:

Class : Class 8
it is dandelion isn't it??? i think it is wind because hair and size

Ans 8:

Class : Class 8
The correct option is (C) or (B)?

Ans 9:

Class : Class 5
Correct answer is A !!! As it is having hair like structure so, it is carried by wind

Ans 10:

Class : Class 9
I think that laksmi is saying correct because we cannot diffrentiate them as it is not clear that they are spines like in xanthium or feather like in dandelion

Ans 11:

Class : Class 8
Can't understand

Ans 12:

Class : Class 9
even I went with B

Ans 13:

Class : Class 8
The Xanthium IS dispersed by animals

Ans 14:

Class : Class 6
the damn picture needs to be clear

Ans 15:

Class : Class 4
The picture is not clear and it cannot be said that it is a xanthium neither can it be said it is a dandelion. I went with B. Please show better qualities pictures sof.

Ans 16:

Class : Class 8

Ans 17:

Class : Class 5
how is this possible

Ans 18:

Class : Class 5
it is C as it is a Xanthium

Ans 19:

Class : Class 5

Ans 20:

Class : Class 6
The picture given did not look like xanthium neither dandelion ,so it looked like dandelion to me so I went with (B)Please give better images

Ans 21:

Class : Class 10
You are correct ans. is B wind because it seems to be light in weight and also hairs that acts like feathers and also wind can carry only light weight seeds.

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