National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 9

Ans 1: (Master Answer)

Class : Class 1
Alpha, Beta, Gamma in ascending order.

Alpha particles leaves the nucleus of an unstable atom at a speed of 16,000 kilometres per second, around a tenth the speed of light.
Beta particles travel at a speed of 270,000 kilometres per second, around 98% of speed of light.
Gamma particles travel at the speed of light.

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 6
Options are wrong. Molecular distance should be less.

Ans 2:

Class : Class 5
wrong wrong wrong wrong wrong wrong

Ans 3:

Class : Class 4
all options are wrong

Ans 4:

Class : Class 4
Qtn. agreed but main point is which is column X and which is column is Y??????

Ans 5:

Class : Class 5
ALL OPTIONS ARE WRONG

Ans 6:

Class : Class 6
I think all options are wrong

Ans 7:

Class : Class 5
I have by mistake typed it Co sorry it will be C. I have a solution we can report error.

Ans 8:

Class : Class 4
all are wrong

Ans 9:

Class : Class 7
The correct answer is C

Ans 10:

Class : Class 5
4wrong question

Ans 11:

Class : Class 6

Ans 12:

Class : Class 5
wrong options

Ans 13:

Class : Class 4
all options are wrong

Ans 14:

Class : Class 5
the options are wrong

Ans 15:

Class : Class 6
There is no specific details about which one is X or Y.So by common sense I think that it would be D.But B

Ans 16:

Class : Class 6
The options given are wrong / confusing. Please clarify.

Ans 17:

Class : Class 4
ansAll answers oposite

Ans 18:

Class : Class 2
SOF IS MAD

Ans 19:

Class : Class 4
All options are WRONG

Ans 20:

Class : Class 4
is there a correction in the options given?if not please clarify with explanation

Ans 21:

Class : Class 4
all Q are wrong

Ans 22:

Class : Class 4
All options are wrong.

Ans 23:

Class : Class 5
The question is wrong... and so the answer is also misleading.

Ans 24:

Class : Class 4

Ans 25:

Class : Class 5
B and Co are same. Intermolecular space is not decreasing in any of the situations. It is wrong.

Ans 26:

Class : Class 6

Ans 27:

Class : Class 6
question, answer and solution is wrongall the options are showing the difference on heating

Ans 28:

Class : Class 5
b and c are all the same

Ans 29:

Class : Class 6
None of the options are correct according to my doubt.

Ans 30:

Class : Class 6
Please please please please please please please please change the question

Ans 31:

Class : Class 3
I agree with Harry , 1 B AND C ARE NOT THE SAME. 2 When liquid is cooled down it forms solid, SO THE ONLY ANSWER IS CCCC

Ans 32:

Class : Class 4
All are wrong. At least number of atoms should be same. So answer should be D

Ans 33:

Class : Class 4
Are B, C, D correct.

Ans 34:

Class : Class 5
all options are wrong

Ans 35:

Class : Class 5
SHOULD HAVE BEEN SPECIFIC WITH RESPECT TO X AND Y MARKING

Ans 36:

Class : Class 6
I also think that.Questions ,options, colums and answers didn't mentioned.

Ans 37:

Class : Class 6
All the options are totally wrong, please change them

Ans 38:

Class : Class 6
ALL ARE WRONG

Ans 39:

Class : Class 7
The question , answer and the solution are all correct … Vrishank don't say that the SOF is mad ( I think you are mad ) you are a FOOL

Ans 40:

Class : Class 5
THE ANSWER IS WRONG.

Ans 41:

Class : Class 4
Please explain the answer. I also support Baibhab that the choices given are wrong.

Ans 42:

Class : Class 7
please change the question.

Ans 43:

Class : Class 4
Option b, c are the same. Pls give me a proper explanation as to why one option is correct

Ans 44:

Class : Class 6
All the answer is wrong. In the NSO book, it is right.

Ans 45:

Class : Class 5
it is wrong

Ans 46:

Class : Class 7
I think al options are wrong . Please tell the correct answer

Ans 47:

Class : Class 4
When a substance is cooled the molecules come closer. But there is no picture showing that the molecules are coming closer there is no correct answer. Also option B and C are the same. Can you please change it?

Ans 48:

Class : Class 4
how can liquid turn into gas by freezing ? Option A does the same thing so the correct option should be D

Ans 49:

Class : Class 5

Ans 50:

Class : Class 5
HARRY CAN YOU PLEASE EXPLAIN ME

Ans 51:

Class : Class 7
you are right vaibhav all are wrong

Ans 52:

Class : Class 5
Can somebody pls answer this question with explanation

Ans 53:

Class : Class 4
Please change it. It is correct in NSO book like Harish Divakar said

Ans 54:

Class : Class 5
Options are wrong. Molecular distance should be less. first fix which column is X and Y.

Ans 55:

Class : Class 6
if an object is cooled down the molecule structure changes from loosely packed to tightly packed. therefore none of the options is correct

Ans 56:

Class : Class 6
option d maybe

Ans 57:

Class : Class 6
PLS. CORRECT

Ans 58:

Class : Class 6

Post Your Answer

Subject :NSO    Class : Class 4

Achin conducted an experiment to find out the amount of light that can pass through three different materials, a clear plastic sheet, a cardboard and a piece of tracing paper. All the materials have the same thickness. He shone a torch on the three materials and used a light sensor to measure how much light has passed through each of them. Which of the following graphs most likely shows the amount of light that has passed through each material?

A
B
C
D


Ans 1:

Class : Class 4
Very Very Good

Ans 2:

Class : Class 5
c

Ans 3:

Class : Class 4
C IS THE CORRECT ANS AS BOTH CLEAR PLASTIC SHEET AND TRACING PAPER ARE BOTH TRANSLUCENT AND HENCE ALLOWING EQUAL AMOUNT OF LIGHT TO PASS THROUGH.

Ans 4:

Class : Class 7
The answer is C .

Ans 5:

Class : Class 5
a

Ans 6:

Class : Class 7
I think the ‘A’ is the right answer

Ans 7:

Class : Class 4
C is right and correct ,and if isnt tell me hhhhhhhhhhhhhhhooooooooooooooooooooowwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwHOW?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????/

Ans 8:

Class : Class 5
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC is correct

Ans 9:

Class : Class 4
AAAAAAAAA IS RIGHT

Ans 10:

Class : Class 1
A is correct

Ans 11:

Class : Class 4
YES , C IS CORRECT @RAJVEER

Ans 12:

Class : Class 7

Ans 13:

Class : Class 5

Post Your Answer

Subject :NSO    Class : Class 2

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5

Ans 2:

Class : Class 7
4 km

Ans 3:

Class : Class 7
4km

Ans 4:

Class : Class 1
answer will be d 4 kilo meters

Post Your Answer

Subject :NSO    Class : Class 9

Ans 1:

Class : Class 10
force=change in momentum/time interval(del t) impulse=change in momentum=force * time interval(del t) SI unit of impulse is newton second or Ns. CGS unit of impulse is dyne second .

Ans 2:

Class : Class 9
SI unit of impluse is Newton

Post Your Answer

Subject :NSO    Class : Class 9

Post Your Answer

Subject :NSO    Class : Class 6

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7
I think option d is correct

Post Your Answer

Subject :NSO    Class : Class 6

Post Your Answer