National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 7
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 2:

Class : Class 7
Yes, but in the given figure it is sedimentation

Ans 3:

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

Ans 4:

Class : Class 8
c

Ans 5:

Class : Class 8
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

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

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

Ans 2:

Class : Class 7
correct option is 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 9

Ans 3:

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
Why so? In both the cases soybean is present.

Ans 2:

Class : Class 8
Supposed to be only ABecause mustard is a non leguminous plantEven it can be rotated with soyabean

Ans 3:

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

Ans 4:

Class : Class 8
Think in the way of leguminous crops

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8
NO OPYIONS!

Ans 2:

Class : Class 7
no options

Ans 3:

Class : Class 6
I typed in c. What is this?

Ans 4:

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 5:

Class : Class 7
they did not give options

Ans 6:

Class : Class 6
I got the question with the options in my laptop. For those who did not get the options : it is the website's fault

Ans 7:

Class : Class 7
They didn't give options

Ans 8:

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

Ans 9:

Class : Class 6
they should be more careful

Ans 10:

Class : Class 6

Ans 11:

Class : Class 8
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 12:

Class : Class 6
No options

Ans 13:

Class : Class 8

Ans 14:

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

Ans 15:

Class : Class 6
options are missing

Ans 16:

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

Ans 17:

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

Ans 18:

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

Ans 19:

Class : Class 7
Want option!

Ans 20:

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 21:

Class : Class 6
they didnt give the options

Ans 22:

Class : Class 7
they didn't given on question page so all my friends and I missed that question

Ans 23:

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

Ans 24:

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

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
Correct answer is, C

Ans 2:

Class : Class 4
c

Ans 3:

Class : Class 2
the correct answer should be C

Ans 4:

Class : Class 4
Correct answer is C

Ans 5:

Class : Class 5
correct ans is C

Ans 6:

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

Ans 7:

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

Ans 8:

Class : Class 4

Ans 9:

Class : Class 7
d

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 5
option c is correct

Ans 2:

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

Ans 3:

Class : Class 5
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 4:

Class : Class 7
yes. Gauri Singh is right . option c is right .

Ans 5:

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

Ans 6:

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 7:

Class : Class 6

Ans 8:

Class : Class 5
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 9:

Class : Class 6
option c is correct

Ans 10:

Class : Class 7
Option C is correct

Ans 11:

Class : Class 7
Option C is right

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
The answer is A. You should Read the book twice again. But even then also you think that the answer is B than the book is a spam. Adaptation is the permanent feature of an organism which helps it to survive in its habitat, while acclimatisation is a temprory feature or change in feature of an organism which helps it to survive in any other place rather than its habitat......................................................................

Ans 2:

Class : Class 8
the answer should "a" as acclimatisation not adaptation

Ans 3:

Class : Class 8
the answer should "a" as acclimatisation not adaptation

Ans 4:

Class : Class 8
the answer should "a" as acclimatisation not adaptation

Ans 5:

Class : Class 8
the answer should "a" as acclimatisation not adaptation

Ans 6:

Class : Class 7
Acclimatization and adaptation mean two totally different things. Adaptation means permanent adjustment to our habitat whereas acclimatization means temporary adjustment to a place where we temporarily stay for some time and get used to. In my opinion, option A is the right answer.

Ans 7:

Class : Class 8
the answer should "a" as acclimatisation not adaptation

Ans 8:

Class : Class 8
the answer should "a" as acclimatisation not adaptation

Ans 9:

Class : Class 8
the answer should "a" as acclimatisation not adaptation

Ans 10:

Class : Class 8
the answer should "a" as acclimatisation not adaptation

Ans 11:

Class : Class 7

Post Your Answer

Subject :NSO    Class : Class 5

Post Your Answer