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Vivek Gulavani from Innisfree House School, Bengaluru
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:

Palash sachin patel from Kips, Patan
Class : Class 8
d is correct answer

Ans 2:

Dhairya Vinayak from Loyola High School, Patna
Class : Class 8

Ans 3:

aditya ranjan from gyan niketan , patna
Class : Class 7
i think amount of water also nedd

Ans 4:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 7
Water is also correct

Ans 5:

Mehaan Bhatt from Pawar Public School , Mumbai
Class : Class 6

Ans 6:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 8
The amount of water also matters right

Ans 7:

shreya from GIIS, KualaLumpur
Class : Class 5

Ans 8:

Kamal Manchenella from Delhi Public School, Hyderabad
Class : Class 7
I feel that it is D

Ans 9:

Shubham Ashish Kulkarni from APEEJAY PITAMPURA, DELHI
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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Aswath Krishna from DPS EAST, Bengaluru
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:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
A is the correct answer

Ans 2:

Tanishtha from DPS, Greater Noida
Class : Class 7
c is the correct answer

Ans 3:

Sohan Choudhury from Delhi Public School Electronic City Bengaluru, Bengaluru
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:

ridhima from mdps, faridabad
Class : Class 6

Ans 5:

Vidula Malkar from DPYA High school, Mumbai
Class : Class 6
a is the correct answer because chemical composition dose not change

Ans 6:

Anika Saha from New Town School, KOLKATA
Class : Class 6
The answer is A.

Ans 7:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 6
answer is a

Ans 8:

VIJAYA SREYAS B from NARAYANA OLYMPIAD SCHOOL KUKATPALLY, HYDERABAD
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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Vivek Gulavani from Innisfree House School, Bengaluru
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:

Medha Bhutani from Christ Academy, Bengaluru
Class : Class 9
ans is option C

Ans 2:

Aarnavi Mann from Scholars rosary Sr. Sec. School, Rohtak
Class : Class 7

Ans 3:

Praveen Rai from Lotus Valley International School, Noida
Class : Class 7

Ans 4:

Harshdeep roy from Bhavans School , Nagpur
Class : Class 7
answer is option c

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Pradhyumna from J S S Public School, Bengaluru
Subject :NSO    Class : Class 4

Ans 1:

Sandipta Bhattacharjee from Sri Ram Narayan Singh Memorial High School, Kolkata
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:

Sandipta Bhattacharjee from Sri Ram Narayan Singh Memorial High School, Kolkata
Class : Class 5
jk kj;

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SANAJY GOPAL BHARTARIYA from ST. FIDELIS COLLEGE, LUCKNOW
Subject :NSO    Class : Class 6

Ans 1:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
it will be maximum near the ground

Ans 2:

VIJAYA SREYAS B from NARAYANA OLYMPIAD SCHOOL KUKATPALLY, HYDERABAD
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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SANAJY GOPAL BHARTARIYA from ST. FIDELIS COLLEGE, LUCKNOW
Subject :NSO    Class : Class 6

Ans 1:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
it will be maximum near the ground

Post Your Answer

Prasuk Jain from Modern Delhi Public School, Faridabad
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:

from Sri Chaitanya Techno School, Bengaluru
Class : Class 9

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is C.

Ans 3:

Aksh singh from The asian school, Dehradun
Class : Class 7

Post Your Answer

Pulkit Gupta from Maxfort School, New Delhi
Subject :NSO    Class : Class 6

Ans 1:

pranavramesh from sri chaitanya techno school, Chennai
Class : Class 6
only dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd

Ans 2:

Mitra Maiti from Techno India Group Public School, Bolpur Prantik
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:

khushi Joshi from Svkm , Mumbai
Class : Class 9
Ans is D as air is all of the above

Ans 4:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 6
i agree with d

Ans 5:

kpks14 from RIMT World School, Chandigarh
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:

Devdarsh hero from HOLY GRACE, Mala
Class : Class 6
ans is D

Ans 7:

Anika Saha from New Town School, KOLKATA
Class : Class 6
ANS IS D

Ans 8:

Sharmi Chowdhury from G.D Birla Centre For Education , Kolkata
Class : Class 7
Answer is d

Ans 9:

niuv from meridian, Hyderabad
Class : Class 6
ANS IS D

Ans 10:

arjun from the bishops school camp , pune
Class : Class 8

Ans 11:

Tanishtha from DPS, Greater Noida
Class : Class 7
ans is d

Ans 12:

satwik patnaik from DPS Rourkela, Rourkela
Class : Class 7
And is b

Ans 13:

HARSHAL KUTE from cambridge school buldhana, Buldhana
Class : Class 6
ans is d

Ans 14:

Ashwak from Cambridge International School, Saudi Al Dera
Class : Class 7
Answer is D

Ans 15:

Agrim Jai from Modern Bharakhamba, Delhi
Class : Class 7
D

Ans 16:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
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:

Utkarsh Chakravarty from Pinnacle High International School, Mumbai
Class : Class 6
i mean except Satwik

Ans 18:

Aarush Laddha from NCFE, bengaluru
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:

Utkarsh Chakravarty from Pinnacle High International School, Mumbai
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:

Videh Jain from Bluebells School International, Delhi
Class : Class 6
ddddddddddddddd

Ans 21:

Shruti Rajshree from NPS Indiranagar, Bengaluru
Class : Class 3
answer is B as given in the answers. there is a solution too

Ans 22:

Praneeth from Null, Null
Class : Class 7
Option D. All of the above.

Ans 23:

pranavramesh from sri chaitanya techno school, Chennai
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:

Naisha from Brilliant public school b, Bilaspur
Class : Class 6
D

Ans 25:

Karthik from Euro, Bengaluru
Class : Class 7
ans is d

Ans 26:

Tanishtha from DPS, Greater Noida
Class : Class 7
ans is d

Ans 27:

Videh Jain from Bluebells School International, Delhi
Class : Class 6
d is the ans

Ans 28:

Praneeth from Null, Null
Class : Class 7
Option D. All of the above.

Ans 29:

Hari Govind from Delhi Public School Chandigarh , Chandigarh
Class : Class 6
THE ANSWER IS D

Ans 30:

Parth Kaushish from MDPS, Faridabad
Class : Class 6
its D come on two total mistakes in one test

Ans 31:

AJAY LAHOTI from SPRINGDALES DUBAI, Dubai
Class : Class 6
I should be d

Ans 32:

Anshuman Mishra from kv no 3, Bhubaneswar
Class : Class 7

Ans 33:

tanmay chaudhry from BAL BHAVAN PUBLIC SCHOOL, New Delhi
Class : Class 4

Ans 34:

Bhabani Prasad from Narayan School, Kolkata
Class : Class 6
D is the ans as air is matter and is very transparent.

Ans 35:

Arsh from Lahs, Gwalior
Class : Class 8
ans is d sof !!!!!!!!!!!!! ans is d

Ans 36:

arnav santosh shinde from new english school , landewadi
Class : Class 4
ANS IS D

Ans 37:

sujata patel from Podar International, Pune
Class : Class 6
dddddddddddddddddddddddddddddddddddddddddd!!!!!!!!!!!!!

Ans 38:

Kanishk Mukherjee from BDM International, Kolkata
Class : Class 6

Ans 39:

ARAMINTA SAHA from VIBGYOR HIGH BALEWADI, PUNE
Class : Class 6
ans is d because it is transparent which allows light to pass, it doesn't observe light but transmits all light

Post Your Answer

Swati from Ryan, Bengaluru
Subject :NSO    Class : Class 8

Ans 1:

chepz from abc school, pandikkad
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)

Admin from revisewise, Noida
Class : Class 1
The correct answer is B.

Ans 3:

N Sankar Narahari from Madhavakripa English Nursery and Higher Primary School, Manipal
Class : Class 7
answer is b

Ans 4:

N Sankar Narahari from Madhavakripa English Nursery and Higher Primary School, Manipal
Class : Class 7
everybody just copy and paste it, can anyone explain in an easier way

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Mihir Arora from dpsg, ghaziabad
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is A.

Post Your Answer

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