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Rio Choudhury from South Point High School, Kolkata
Subject :NSO    Class : Class 7

Ans 1:

Rishik Bose from Vibgyor High, Airoli, Mumbai
Class : Class 8

Ans 2:

Rithvik from BVM Global, Chennai
Class : Class 9
ummm........... its very tough to identify them....

Ans 3: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
Molars and Premolars are mainly used to chew the food.

Ans 4:

Pari Shiddam from PIS Powai, MUMBAI
Class : Class 8
D can also be the ans

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vaibhav from , Faridabad
Subject :NSO    Class : Class 7

Ans 1:

Maanasa from Billabong high, Chennai
Class : Class 7

Ans 2:

Aksh Swarnkar from National Center for Excellence CVR, Bangalore
Class : Class 7

Ans 3:

aryan vir from lotusvalley international school gurugram, Gurgaon
Class : Class 7

Ans 4:

aryan vir from lotusvalley international school gurugram, Gurgaon
Class : Class 7

Ans 5:

Anand Agarwal from stems, kuchinda
Class : Class 7

Ans 6:

shweta garg from Apeejay School, Ghaziabad
Class : Class 7

Ans 7:

Arush from Anandi Public School, Udgir
Class : Class 3
such questions r always confusing.................

Ans 8:

aryan vir from lotusvalley international school gurugram, Gurgaon
Class : Class 7

Ans 9:

Areyouseriousrn from SBOA Global, Chennai
Class : Class 9
Is D. ✔

Ans 10:

Arush from Anandi Public School, Udgir
Class : Class 3

Ans 11:

Areyouseriousrn from SBOA Global, Chennai
Class : Class 9
The solution: Enzyme X works best and increases the rate of reaction at an acidic pH (less than 7) of about two2️⃣ ! Enzyme Y is very very very very very very very very very very very very very very very very very efficient @ slightly acidic pH i.e., slightly less than seven!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Enzyme Z is most efficient at an alkaline pH (more than 7!!!). And alkali means a base which is soluble in water. In humans, gastric juice of stomach (a J-shaped bag with thick inner walls. Meh.) has pH in the range of 1.5-2.5, where enzymes such as pepsin, rennin etc. carry out the digestion of food. Thus, enzyme X can be found in stomach. Similarly, the saliva in the mouth of humans has sliiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiightly acidic pH of 6.8, where salivary amylase enzyme is moooooooooooooooooooooooooooooooooooooooost effective! Thus, enzyme Y can be found in the buccal cavity. Small intestine has slightly alkaline pH of 7.8, where enzymes such as trypsin help in digestion of food. So, enzyme Z can be found in duodenum. Morus Alba is the scientific name of mulberry.

Ans 12:

Soumyajit Roy from Delhi Public School Jamnagar, Jamnagar
Class : Class 9

Ans 13:

Tanushree from Asian International School, Colombo
Class : Class 7
Can someone pls send the explanation of why it's D🙏

Ans 14:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 10

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ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Refer to the given paragraph and table and answer the following questions.
Neha took 100 gm each of three types of soil, X, Y and Z, in three separate pots with hole at the bottom. The amount of water that was poured in the soil pot, just before it started dripping from the bottom hole, is tabulated here.

The soil that is mixture of clay, sand, humus and is usually very good for growth of most plants is __________.

A X
B Y
C Z
D Cannot be determined


Ans shd be D (Cannot be determined)

Ans 1:

ABHAY AGARWAL from ,
Class : Class 3

Ans 2:

ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur
Class : Class 9
B IS THE ANSWER ANURADHA NAIR 4C

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ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Ans 1:

Mohammad Shahid from Dayawati Modi International Maple Bear, Modipuram, Meerut 250110, Meerut
Class : Class 4
how the released gas from refrigerator is CO2

Ans 2:

Nishchita from Gems Modern Academy , Dubai
Class : Class 8
The answer is B as when we use electricity fuel gets burnt and so it produces carbon dioxide.

Ans 3:

Mohhika Sharma from Delhi Public School Greater Noida, Greater Noida
Class : Class 7
I think the answer should be CFC but it is not in the options only.But I also think that it is CO2.

Ans 4:

Adit Aggarwal from Vibgyor High, Bengaluru
Class : Class 5
The answer was supposed to be CFC .

Ans 5:

Aaditya Saxena from Ryan International School Pune, Pune
Class : Class 6
The Ans shud be B Carbon Dioxide. BBBBBBBBBBB

Ans 6:

Shaurya Veer from Army Public School ASC C and C , Bangalore
Class : Class 10
The correct answer should be CFC

Ans 7:

SRISANTH from Edify, Tirupathi
Class : Class 5
Actually it is b ,as a is CNG(compressed natural gas which is a energy source that is not a greenhouse gas

Ans 8:

BV Karthikeya from Sentia, Hyderabad
Class : Class 6

Ans 9:

Tanirika Bansal from DPS Faridabad, Faridabad
Class : Class 4
CFCS should be correct answer but I got it right

Ans 10:

somesh from Centre point katol road, Nagpur
Class : Class 6
It is CNG

Ans 11:

Rehaan Sejwal from Gyan Bharati school, Delhi
Class : Class 7

Ans 12:

SAURISH from R.N. Podar, Mumbai
Class : Class 10
THE OPTION SHOULD HAVE BEEN CFC OR WE CAN TAKE THE OPTION D [NITROGEN] BUT IT IS SHOWING WRONG

Ans 13:

BV Karthikeya from Sentia, Hyderabad
Class : Class 6
I GOT IT CORRECT

Ans 14:

Visakha Dhar from GD Goenka, jhajjar
Class : Class 3
the correct answer is CFCs .but is not mention in the option.

Ans 15:

Abhinav Kulkarni from National Centre For Excellence, Bengaluru
Class : Class 4
the ans should be CFC

Ans 16:

ABHAY AGARWAL from ,
Class : Class 3

Ans 17:

Anika S Kumar from Alphabets International school , Chennai
Class : Class 7
Chloro-fluro-carbon

Ans 18:

Mehvish Khursheed from DPSGV, ghaziabad
Class : Class 5
correct answer is CFC

Ans 19:

Deepika from Vibgyor high, Mumbai
Class : Class 1
It should be CFCS

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Jairaj Singh Basur from Vivek High School, Chandigarh
Subject :NSO    Class : Class 6

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shashwat pal from mnr school of excellence, navi mumbai
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

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

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shashwat pal from mnr school of excellence, navi mumbai
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

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

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Sahasra Shanker from KV IIT, Chennai
Subject :NSO    Class : Class 6

Ans 1:

SANJEEV VARSHNEY from Lotus valley international school, Noida
Class : Class 5
ans is D

Ans 2:

Shreyansh Gupta from MVN, faridabad
Class : Class 6
WHY DEOS THE COPY PASTE BOT WORK

Ans 3:

Advik from DPS Patna, Patna
Class : Class 4
answer ddd

Ans 4:

ansh rai from delhi public school, Bhilai
Class : Class 4

Ans 5:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
the answer is d

Ans 6:

Dushyant Singh from Shree Ram Centenial School, Indore
Class : Class 9
a

Ans 7:

Ritvik Bansal from K R Mangalam World School, Gurgaon
Class : Class 7
answer is clearly a

Ans 8:

arin chaitanya from the shri ram school, New Delhi
Class : Class 8
answer is a

Ans 9:

Rishit Garg from Bhavan s B P Vidya Mandir , Nagpur
Class : Class 9
dddddddanswer is D

Ans 10:

from , dhule
Class : Class 7
master answwer really

Ans 11:

Eashta Khodke from Elpro International School Chinchwad Pune, Pune
Class : Class 8
no,the ans is ' a 'as ,earthing aldready protetcts us ,so we do not need to get protection from earthing

Ans 12:

Shreyansh Gupta from MVN, faridabad
Class : Class 6
OH NOOOOO i dint know that earthing do this argh i haveg ot 9/10 my only question that was wrong is this

Ans 13:

Eva jangra from GD Goinka Public school, Bahadurgarh
Class : Class 6
The answer is D)

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Sahasra Shanker from KV IIT, Chennai
Subject :NSO    Class : Class 6

Ans 1:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10

Ans 2:

Raghav from Shalom Hills International school, Gurgaon
Class : Class 6

Ans 3:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
*as if the one bulb was connected

Ans 4:

Irresh Vijay from NPSI Singapore, Singapore
Class : Class 8

Ans 5:

Parshti Bajpai from Modern Public School, ALWAR
Class : Class 7
I thought of B but after checking the solution I got it that it's A only, so the answer is A

Ans 6:

khushi Joshi from Svkm , Mumbai
Class : Class 10
I agree with Abhaid Goel.

Ans 7:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
I agree with omkar,maitri,abhid etc all who are saying option B because we can read that another bulb 'Z' is connected in "PARALLEL" and not in "SERIES" and as we know , if we connect many bulb with same battery in a parallel circuit , they will give same brightness if the one bulb was connected , but the consumption of battery will also increase.So, according to me , there will be no change in bulb y (NORMAL)ans should be : option "A"

Ans 8:

Ryan Geo from Birla Public School, DOHA
Class : Class 7

Ans 9:

Dushyant Singh from Shree Ram Centenial School, Indore
Class : Class 9
a is the correct answereverywhere

Ans 10:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Class : Class 10

Ans 11:

Parthvi Mishra from DPS Nacharam, Hyderabad
Class : Class 6

Ans 12:

Anudeepti Dutta from Delhi Public School-Bangalore East, Bangalore
Class : Class 9
i think it is b

Ans 13:

Mitra Maiti from Techno India Group Public School, Bolpur Prantik
Class : Class 6

Ans 14:

Abhishri Dwivedi from gems modern academy , Dubai
Class : Class 6
I think (A) is the answer because the explanation in the solution makes complete sense but technically it could also be (B)

Ans 15:

Abhaid Goel from Indian School , Muladha
Class : Class 10
correct answer should be option B because there is no change in the current passing through lamp Y.

Ans 16:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
I think B or C is correct. Master Answer explain this

Ans 17:

Agustya vaid from Somerville school vasundhara enclave, Delhi
Class : Class 7
i agree with him too

Ans 18:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
b is answer

Ans 19:

Sara Kapoor from Manav Rachna International School charmwood, Faridabad
Class : Class 7
it is b only not c pls report an error

Ans 20:

Omkar Deshmukh from phoenix greens international school, Hyderabad
Class : Class 7
It should be B as no change of current is there in Y.

Ans 21:

Arunima from dps, Bharuch
Class : Class 6
Shouldn't the answer be option B, because it makes the most sense. No electricity or amps or power is taken away from bulb Y. Why is it answer A?

Ans 22:

shreyash from amaatra, bangalore
Class : Class 3
yaa me 2 i think its b\

Ans 23:

Mitra Maiti from Techno India Group Public School, Bolpur Prantik
Class : Class 6
The correct answer is B as the bulb Y is in straight series and there is no change of current passing through it. And the curent gets equally divided among X and Y.

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Pranesh kannan from Dr g s k, Kumbakonam
Subject :NSO    Class : Class 7

Ans 1:

Sriyansh from Surabhi , Hosapete
Class : Class 9
The scientific name of WBC is leukocyte. There are 5 types of leukocytes namely: Basophils , Eosinophil, Neutrophil, Lymphocyte. The scientific name of red blood cells is erythrocytes. Maybe there is no scientific name for platelets or it may appear that I don't know it.

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