National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3

Ans 2:

Class : Class 3
all of these

Ans 3:

Class : Class 6
D

Ans 4:

Class : Class 3
A is not correct D is correct

Ans 5:

Class : Class 5
D

Ans 6:

Class : Class 5
A

Ans 7:

Class : Class 5
All of these

Ans 8:

Class : Class 3
all of these option(D)

Ans 9:

Class : Class 3
D is correct

Post Your Answer

Subject :NSO    Class : Class 7

Read the given data and select the correct option for the following questions.
Raman carried out an experiment to find out how fast water can pass through four different types of soil. He put each type of soil in four pots with equal sized holes at the base and placed separate dishes at their bottom to collect water. He poured water in them one by one, and used a stopwatch to record the time taken for water to reach the level he had marked same in each dish. His recording is given in the table as shown below.


What factors should Raman keep the same to ensure a fair test?
(i) The amount of soil
(ii) The size of the pot
(iii) The shape of the dish
(iv) The amount of water

A (iii) and (iv) only
B (i) and (ii) only
C (ii), (iii) and (iv) only
D (i), (ii), (iii) and (iv)


How can it be a fair test if the amount of water varies

Ans 1:

Class : Class 8
The amount of water also matters right

Ans 2:

Class : Class 8

Ans 3:

Class : Class 8

Ans 4:

Class : Class 7
All the given factors are required for a fair test ; So option D would be the correct answer

Ans 5:

Class : Class 8
d is correct answer

Ans 6:

Class : Class 5

Ans 7:

Class : Class 6

Ans 8:

Class : Class 7
Water is also correct

Ans 9:

Class : Class 7
I do agree it's D

Ans 10:

Class : Class 7
D

Ans 11:

Class : Class 7
I feel that it is D

Ans 12:

Class : Class 7

Ans 13:

Class : Class 8
shape of dish also should be included. Amount of water poured doesnt matter as long as you are collecting equal volume in all dishes. Hence similar dishes is important.

Ans 14:

Class : Class 7
i think amount of water also nedd

Post Your Answer

Subject :NSO    Class : Class 6

A potter shapes pots out of clay (Process 1). He then bakes the pots in an oven (Process 2). Which of the following statements is correct?

A Process 1 is a reversible, physical change while process 2 is an irreversible, physical change.
B Process 1 is an irreversible, physical change while process 2 is an irreversible, chemical change.
C Process 1 is a reversible, physical change while process 2 is an irreversible, chemical change.
D None of these.


Is it A or C?

Ans 1:

Class : Class 6
C because we can get clay back from a wet pot by smashing it,but once it heats up, it dries the clay and makes it stone hard.

Ans 2:

Class : Class 6
on heating, the clay pot doesn't turn into stone,right?it doesn't change composition once heated , it is still clay ! answer is "A"

Ans 3:

Class : Class 6
C,because- it is a chemical change. after baking we can break it into smaller particles but it won't form the same clay, with same properties again

Ans 4:

Class : Class 6
A is the correct answer

Ans 5:

Class : Class 6
A is correct because it just turns hard but it is still clay only.And also chemical change doesn't mean that it is irreversible,Chemical change means that the identity of the substance we started with is lost.Here the identity is not lost.So A is correct.

Ans 6:

Class : Class 6
The answer is A.

Ans 7:

Class : Class 6
answer is a

Ans 8:

Class : Class 6

Ans 9:

Class : Class 7
a is the correct answer because chemical composition dose not change

Ans 10:

Class : Class 7
c is the correct answer

Post Your Answer

Subject :NSO    Class : Class 7

A student took an iron rod and a wooden rod and wrapped each of them in a piece of paper. These were then heated as shown. It was found that the paper around the iron rod does not burn whereas the one around the wooden rod catches fire. It is because


A Candle, in case of iron rod, is nearer to the paper
B Wood being a bad conductor of heat, takes away all the heat
C Iron being a good conductor of heat, conducts away the heat given to the paper
D Paper, in first case, is thicker.


could someone please explain the answer

Ans 1:

Class : Class 7

Ans 2:

Class : Class 7

Ans 3:

Class : Class 7
answer is option c

Ans 4:

Class : Class 9
ans is option C

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
jk kj;

Ans 2:

Class : Class 5
Not kerwa its kewra. It is an extract that is distilled from the flower of the Pandanus plant. Kewra water is very similar to rosewater. It is used to flavour South Asian cuisine.

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
it will be maximum near the ground

Ans 2:

Class : Class 6
As it goes up,kinetic energy decreases due to gravity while potential energy increases with height. As it comes down, kinetic energy increases due to gravity while potential energy decreases.

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
it will be maximum near the ground

Post Your Answer

Subject :NSO    Class : Class 7

Saurabh burned two different fibres X and Y in order to identify them. X smelt like burning paper while Y smelt like burning hair. Which of the following options correctly identifies the two fibres?


Ans 1:

Class : Class 9

Ans 2:

Class : Class 7

Ans 3: (Master Answer)

Class : Class 1
The correct answer is C.

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
sof the answer is ddd so many times i am really fed up of your wrong answers and that is really very shamful on you.

Ans 2:

Class : Class 6
i mean except Satwik

Ans 3:

Class : Class 6
It is true that air is a perfectly transparent object. It neither absorbs nor reflects light. It transmits whole of light. So, all the options are correct and answer is D.

Ans 4:

Class : Class 7
ans is d

Ans 5:

Class : Class 8
ans is d sof !!!!!!!!!!!!! ans is d

Ans 6:

Class : Class 6
only dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd

Ans 7:

Class : Class 6
Answer is D as air it neither absorbs or reflects light,its almost transparent,it transmits the whole of light.

Ans 8:

Class : Class 7
ans is d

Ans 9:

Class : Class 6
these days sof olympiad trainer has gone mad. in one test, i got 4 perfectly wrong question . and now this . this adds up to fivei do not know what is the problemans should be ddddddddd!!!!!

Ans 10:

Class : Class 4

Ans 11:

Class : Class 6
its D come on two total mistakes in one test

Ans 12:

Class : Class 7

Ans 13:

Class : Class 6
i agree with d

Ans 14:

Class : Class 6
ANS IS D

Ans 15:

Class : Class 6
D is the ans as air is matter and is very transparent.

Ans 16:

Class : Class 7
d is the answer but the trainer is showing b as answer air reflects light that is why the sky is blue

Ans 17:

Class : Class 8

Ans 18:

Class : Class 6
THE ANSWER IS D

Ans 19:

Class : Class 6
ANS IS D

Ans 20:

Class : Class 9
Ans is D as air is all of the above

Ans 21:

Class : Class 3
answer is B as given in the answers. there is a solution too

Ans 22:

Class : Class 6
ans is D

Ans 23:

Class : Class 7
ans is d

Ans 24:

Class : Class 7
Option D. All of the above.

Ans 25:

Class : Class 6
ans is d

Ans 26:

Class : Class 7
D

Ans 27:

Class : Class 6
Answer is D

Ans 28:

Class : Class 6

Ans 29:

Class : Class 4
The correct answer should be option D, All of these

Ans 30:

Class : Class 6
D

Ans 31:

Class : Class 6
ans is d because it is transparent which allows light to pass, it doesn't observe light but transmits all light

Ans 32:

Class : Class 7
Option D. All of the above.

Ans 33:

Class : Class 7
And is b

Ans 34:

Class : Class 8
Answer is D

Ans 35:

Class : Class 6
I should be d

Ans 36:

Class : Class 6
ddddddddddddddd

Ans 37:

Class : Class 4
ANS IS D

Ans 38:

Class : Class 6
d is the ans

Ans 39:

Class : Class 7
Answer is d

Ans 40:

Class : Class 6
dddddddddddddddddddddddddddddddddddddddddd!!!!!!!!!!!!!

Ans 41:

Class : Class 6
I agree with everyone is Satwik because air trasparent it neither reflects nor absorbs light and trasmits whole of light So ans is D

Post Your Answer

Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8

Ans 2:

Class : Class 7
everybody just copy and paste it, can anyone explain in an easier way

Ans 3: (Master Answer)

Class : Class 1
The correct answer is B.

Ans 4:

Class : Class 10
The common error is to think that pressure at 0.4h above the surface of the reservoir of mercury is 0.4 times the atmospheric pressure. The pressure at p is caused by the weight of mercury above point P. Thus preesure at P is equal to : 0.6x 100000 = 60000 Pa

Ans 5:

Class : Class 7
answer is b

Post Your Answer

X Y
(A) Wool Silk
(B) Cotton Rayon
(C) Cotton Silk
(D) Silk Wool