National Science Olympiad Forum By SOF Olympiad Trainer

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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
d is correct answer

Ans 2:

Class : Class 8

Ans 3:

Class : Class 7
i think amount of water also nedd

Ans 4:

Class : Class 7
Water is also correct

Ans 5:

Class : Class 6

Ans 6:

Class : Class 8
The amount of water also matters right

Ans 7:

Class : Class 5

Ans 8:

Class : Class 7
I feel that it is D

Ans 9:

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.

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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
A is the correct answer

Ans 2:

Class : Class 7
c is the correct answer

Ans 3:

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 4:

Class : Class 6

Ans 5:

Class : Class 6
a is the correct answer because chemical composition dose not change

Ans 6:

Class : Class 6
The answer is A.

Ans 7:

Class : Class 6
answer is a

Ans 8:

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.

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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 9
ans is option C

Ans 2:

Class : Class 7

Ans 3:

Class : Class 7

Ans 4:

Class : Class 7
answer is option c

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Subject :NSO    Class : Class 4

Ans 1:

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.

Ans 2:

Class : Class 5
jk kj;

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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.

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
it will be maximum near the ground

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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: (Master Answer)

Class : Class 1
The correct answer is C.

Ans 3:

Class : Class 7

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
only dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd

Ans 2:

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 3:

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

Ans 4:

Class : Class 6
i agree with d

Ans 5:

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 6:

Class : Class 6
ans is D

Ans 7:

Class : Class 6
ANS IS D

Ans 8:

Class : Class 7
Answer is d

Ans 9:

Class : Class 6
ANS IS D

Ans 10:

Class : Class 8

Ans 11:

Class : Class 7
ans is d

Ans 12:

Class : Class 7
And is b

Ans 13:

Class : Class 6
ans is d

Ans 14:

Class : Class 7
Answer is D

Ans 15:

Class : Class 7
D

Ans 16:

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 17:

Class : Class 6
i mean except Satwik

Ans 18:

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

Ans 19:

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

Ans 20:

Class : Class 6
ddddddddddddddd

Ans 21:

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

Ans 22:

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

Ans 23:

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 24:

Class : Class 6
D

Ans 25:

Class : Class 7
ans is d

Ans 26:

Class : Class 7
ans is d

Ans 27:

Class : Class 6
d is the ans

Ans 28:

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

Ans 29:

Class : Class 6
THE ANSWER IS D

Ans 30:

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

Ans 31:

Class : Class 6
I should be d

Ans 32:

Class : Class 7

Ans 33:

Class : Class 4

Ans 34:

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

Ans 35:

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

Ans 36:

Class : Class 4
ANS IS D

Ans 37:

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

Ans 38:

Class : Class 6

Ans 39:

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

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Subject :NSO    Class : Class 8

Ans 1:

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 2: (Master Answer)

Class : Class 1
The correct answer is B.

Ans 3:

Class : Class 7
answer is b

Ans 4:

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

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Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Class : Class 1
The correct answer is A.

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