National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
ans is c

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
Plug key is also a type of switch.

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 8
Yes, but in the given figure it is sedimentation

Ans 2:

Class : Class 5
Ya, filtration can also remove insoluble impurities but in this case sedimentation and decanation is more appropriate answer.

Ans 3:

Class : Class 9
it needs to be sedimentation and decantation because the insoluble material present in the liquid is quite heavy you only perform filtration when the particles float over the surface of the water

Ans 4:

Class : Class 8
sedimentation and decantation is the answer . but filtration can not come because we can see in the picture itself that the particles are big ,that's why sedimentation and decantation . if the particles are small but yet insoluble , then only it is filtration . I hope that you understood.

Ans 5:

Class : Class 8
c

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
correct option is c

Ans 2:

Class : Class 9
every single sound has its own secondary waves, so the correct option must be option C.

Post Your Answer

Subject :NSO    Class : Class 8

Read the given statements and select the correct option.
Statement 1 : Phosphorus burns in air at room temperature.
Statement 2 : It is an example of spontaneous combustion.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true and statement 2 is false.
D Both statements 1 and 2 are false.


I say it is option a but they say it is b....But isn’t this definitely due to spontaneous combustion?

Ans 1:

Class : Class 9

Ans 2:

Class : Class 8

Ans 3:

Class : Class 4

Ans 4:

Class : Class 8
Hi, the statement 2 is true but just tells about the type type combustion to which the reaction given in statement belong. it does not tell about actual cause of burning of phosphorus in air at room temperature. the reason for statement 1 is that phosphorus is a highly reactive element that's why burns in air at room temperature.

Post Your Answer

Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
Think in the way of leguminous crops

Ans 2:

Class : Class 8
Why so? In both the cases soybean is present.

Ans 3:

Class : Class 3
yeah right Triguna!!! in both cases soybean is present? why so?

Ans 4:

Class : Class 9
Supposed to be only ABecause mustard is a non leguminous plantEven it can be rotated with soyabean

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
they didnt give the options

Ans 2:

Class : Class 6
They're not even giving me options

Ans 3:

Class : Class 8
my laptop din't provide the options

Ans 4:

Class : Class 7
They didn't give options

Ans 5:

Class : Class 8
NO OPYIONS!

Ans 6:

Class : Class 6

Ans 7:

Class : Class 7
Want option!

Ans 8:

Class : Class 6
options are missing

Ans 9:

Class : Class 6
they should be more careful

Ans 10:

Class : Class 6
No options

Ans 11:

Class : Class 6
The shadow will be whole black as the book is an opaque object and will not allow any light to pass through it so on the screen it will form a shadow. And the rest that is the ring, no light will reach it thus how can its shadow be formed?

Ans 12:

Class : Class 7
I typed in c. What is this?

Ans 13:

Class : Class 7
they did not give options

Ans 14:

Class : Class 8

Ans 15:

Class : Class 9
they didn't given on question page so all my friends and I missed that question

Ans 16:

Class : Class 8
no options

Ans 17:

Class : Class 6
they MUST and SHOULD be more CAREFUL. No options??? Then, how should we answer their question??? they take no actions! look:-a person has commented a year ago but?NO RESPONSE

Ans 18:

Class : Class 9
They did not give the options on my iPad so I couldn't see which was the correct ans. something needs to be done about this problem.

Ans 19:

Class : Class 6
They did not provide options on my laptop but option C is correct.

Ans 20:

Class : Class 6
They did not give options on my ipad .

Ans 21:

Class : Class 8
They did not give options so that is why it went wrong. these kind of incidents happen very frequently in SOF

Ans 22:

Class : Class 8
iT IS NOT LAPTOP'S MISTAKE IT IS THE WEBSITE'S MISTAKE ITSELF.

Ans 23:

Class : Class 8
they didn't give the options to my computer

Ans 24:

Class : Class 7
I got the question with the options in my laptop. For those who did not get the options : it is the website's fault

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 6
correct ans is C

Ans 2:

Class : Class 7
d

Ans 3:

Class : Class 4
Correct answer is C

Ans 4:

Class : Class 4

Ans 5:

Class : Class 4
THE CORRECT ANSWER IS D BECAUSE THEY NEED TO OVERCOME DEFICIENCY OF NITROGEN

Ans 6:

Class : Class 4
D is correct

Ans 7:

Class : Class 4
B,Care correct as they can not do photosynthesis , uses his leaves to catch food

Ans 8:

Class : Class 4
Correct answer is, C

Ans 9:

Class : Class 4
c

Ans 10:

Class : Class 4
I think Dalso

Ans 11:

Class : Class 4

Ans 12:

Class : Class 5
Correct answer is D.Because insectivores plants can photosynthesise.

Ans 13:

Class : Class 4
B C D is the answers

Ans 14:

Class : Class 2
the correct answer should be C

Post Your Answer

Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
U

Ans 2:

Class : Class 3
U

Post Your Answer

Subject :NSO    Class : Class 5

One afternoon Ravi and Mohit were playing in park.All of a sudden, Ravi felt uneasy and started to bleed through nose. What should Mohit do immediately to handle the situation?

AHe should blow some warm air on a handkerchief and put it over Ravi’s mouth.
BHe should make Ravi sit on a bench or chair with his head held back.
CHe should block Ravi’s nose with a piece of cloth to stop the bleeding.
DHe should apply some antiseptic within Ravi’s nose using some cotton.


Ans 1:

Class : Class 7

Ans 2:

Class : Class 7
Option C is correct

Ans 3:

Class : Class 6
Answer B is right because if you refer to the 4th grade book, the first point written is to tilt your your head back

Ans 4:

Class : Class 8
yes. Gauri Singh is right . option c is right .

Ans 5:

Class : Class 8
Option C is right

Ans 6:

Class : Class 6
i agree with Gauri Singh and Kashvi Sharma

Ans 7:

Class : Class 5
On page 75 of "Learning Science for Smarter Life" for class V it is mentioned that person should sit down and lean forward. It also says to pinch the nose.All answer choices of this question are therefore incorrect.

Ans 8:

Class : Class 7
option c is correct

Ans 9:

Class : Class 8
Yes,In the book it is said that the patient should be made sit and lean forward not backward and patient should be told to pinch the sides of the nose together. So the answer should be C.

Ans 10:

Class : Class 5
option c is correct

Ans 11:

Class : Class 6
option b is correct because by sitting with his head facing up wards would take the blood flow downside

Post Your Answer