National Science Olympiad Forum By SOF Olympiad Trainer - Page 647
  1. Home
  2. /  Forum

User Forum

Ask Your Question
Adithi Keshava from National Center For Excellence , Bangalore
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

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

Ans 2:

Kriti Bhonsale from Delhi Public School, Bengaluru
Class : Class 5

Ans 3:

Ankush Dey from Sri Chaitanya Techno School Newtown, Kolkata
Class : Class 6
My Answer is DPollination is when pollen of a plant travels from one plant to another by something (i.e.Insect and water). Pollens are used to grow seeds in the plant

Ans 4:

Emma Miriam George from Sophia High School, Bangalore
Class : Class 3

Ans 5:

Aditya N K from Bharathiya Vidya Bhavan, Calicut
Class : Class 4
what is pollination

Ans 6:

Yatindra G from SBOA, Chennai
Class : Class 4
Guys!! Date palm grows in deserts. they are asking about a plant in hilly ares.

Ans 7:

sanjana from NARAYANA E TECHNO , Chennai
Class : Class 8

Ans 8:

Sashrik S Bhalerao from NHP school, Airoli
Class : Class 1
D.

Ans 9:

sanjana from NARAYANA E TECHNO , Chennai
Class : Class 8

Ans 10:

Jasnoor from DAV public school, Ludhiana
Class : Class 4
A

Ans 11:

Harsh Sobti from the samhita academy, BLR
Class : Class 5
I go with Jasnoor's option. A

Ans 12:

Advaita sinha from NPSI, Singapore
Class : Class 5

Ans 13:

Shreyansh Saha from Dps Megacity, Kolkata
Class : Class 5
Option D

Post Your Answer

param ahuja from m.p.s, Ajmer
Subject :NSO    Class : Class 7

Ans 1:

Shravan from Harvest International School , Bangalore
Class : Class 9
@sjash the question is trying to say that E is second to the right of a, not c

Ans 2:

ADWIKA from DAV, FARIDABAD
Class : Class 10

Ans 3:

sjash from tagore international, New Delhi
Class : Class 9
but the ques is wrong........if a is sitting between g and c, how is c second to the right of a ???????

Ans 4:

Gouse Jani from Aditya talent school, Kakinada
Class : Class 7
DB

Ans 5: (Master Answer)

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

Post Your Answer

param ahuja from m.p.s, Ajmer
Subject :NSO    Class : Class 7

Ans 1:

Rithvik from BVM Global, Chennai
Class : Class 9
c and d

Ans 2:

Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee
Class : Class 10
not c i think

Ans 3:

RAHUL S ROY from ST.XAVIERS HIGH SCHOOL,VAPI, VAPI,GUJARAT
Class : Class 7
option c is correct

Ans 4:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Both C and D are correct

Ans 5:

Atharva Shrikhande from Euro School, Pune
Class : Class 9
both options "C" and "D" are correct in my opinion cause as the car is moving at a constant speed there is no acceleration and as the car is being ridden on a straight road direction of movement also does not change, Hence proving that both option "C" and "D" are correct. I hope my answer was helpful. A very Happy New Year to all

Ans 6:

Venya Vikas from Chirec International , Hyderabad
Class : Class 7
Both option C and option D are correct as since it is moving in constant speed, it's acceleration will be zero and the direction will not change as it was not mentioned and the particle is travelling on a straight road

Ans 7:

govindkrishnan p from KENDRIYA VIDYLAYA PAYYANUR, PAYYANUR
Class : Class 7
Both 'C' and 'D' are correct

Ans 8:

RAHUL S ROY from ST.XAVIERS HIGH SCHOOL,VAPI, VAPI,GUJARAT
Class : Class 7
option c is correct as acceleration means change of speed

Ans 9:

Shuvangi Das from Vivekananda mission school, haldia
Class : Class 9
Both C and D I prefer. SOF pls check

Ans 10:

Manu Dagur from Rukmani Birla Modern High School, Jaipur, JAIPUR
Class : Class 10
D as it is mentioned that the particle is travelling at a constant speed

Ans 11:

Maanasa from Billabong high, Chennai
Class : Class 7
agoogle says a

Post Your Answer

param ahuja from m.p.s, Ajmer
Subject :NSO    Class : Class 7

Ans 1:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7
Here the properties of lines and angles will be applied.Then the laws of reflection

Ans 2:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7
The correct is C

Ans 3: (Master Answer)

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

Ans 4:

Anshuman D from MVM, Hyderabad
Class : Class 9
I actually don't get the logic behind it

Ans 5:

Anshuman D from MVM, Hyderabad
Class : Class 9
I am not able to understand it

Ans 6:

Ridhima Sahu from Bal Bharati Public School , Navi Mumbai
Class : Class 7
Answer is (a). This is observed due to this reasonThere's a line which is making an angle 55° and is a linear pair. Hence the angle of line (mirror) p is 180°. But 55° is not the angle of incidence. To get the sum of angle of incidence and reflection, we multiply 55° by 2 and get 70°. Since angle of incidence =angle of reflection, 70°÷2=35°. The angle of incident ray and the reflected ray of P and Q are same thus the sum of the angle of incidence and angle of reflection would be the same (70°). We know, angle of incidence=angle of reflection, hence 70°÷2=35°. Or A=35°

Post Your Answer

param ahuja from m.p.s, Ajmer
Subject :NSO    Class : Class 7

Ans 1:

Md.ZEESHAN ali from St. Agness branch school, Kharagpur
Class : Class 4
yes according to me also the answer is c but in nso practice papers it is written as d

Ans 2:

Miheet parikh from Jamnabai narsee school, Mumbai
Class : Class 2
A

Ans 3:

Om Goel from Ryan International School, New Delhi
Class : Class 10
the answer should be B because cocave lens is a diverging lens which will diverge the light to all parts of the room

Ans 4:

Sanjay Kumar from Vellammal Vidyashram, Chennai
Class : Class 5
Ans c

Ans 5:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7
0hi hi hih h hi hi hi hii

Ans 6:

Jai kumar Bohara from Dps, Udaipur
Class : Class 9
yes ans c

Ans 7:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7
The correct answer is D.

Ans 8:

siddarth from DPS Ecity, Bengaluru
Class : Class 8
ans= c

Ans 9:

arvin from KC INTERNATIONAL SCHOOL JAMMU, Jammu
Class : Class 7
The answer is B

Ans 10:

Tanush Rao from Delhi Public School Vasant Kunj, Delhi
Class : Class 8

Ans 11:

ALICE from Delhi Public School, UDAIPUR
Class : Class 9

Post Your Answer

priyanshi gupta from opg world school , delhi
Subject :NSO    Class : Class 4

Ans 1:

LAVANYA DADHWAL from BLOOM PUBLIC SCHOOL, South West Delhi
Class : Class 8
D is correct

Ans 2:

Vihaan Nair from Ambassador School, DUBAI
Class : Class 8
I think B and D is correct.

Ans 3:

Ridhan from SFS janakpuri, New Delhi
Class : Class 5
the answer is d

Ans 4:

Jithisha Barapati from Dimensions, Hyderabad
Class : Class 4
D is correct

Ans 5:

PARTH PANCHAL from NEW HORIZON SCHOLARS SCHOOL, THANE
Class : Class 7
yes you are right

Ans 6:

Pankaj Rajput from RBK GLOBAL SCHOOL, THANE
Class : Class 4

Ans 7:

Arnav kaul from Chirec, Hyderabad
Class : Class 2

Ans 8:

Bhavinkumar Gosai from The New Tulip International School, Ahmedabad
Class : Class 4
NONE of these is the correct answer

Post Your Answer

SHAURYA RAJ from LITERA VALLEY SCHOOL, PATNA
Subject :NSO    Class : Class 3

Post Your Answer

ADVAITH KRISHNAN from SHISHUKUNJ INTERNATIONAL SCHOOL, INDORE
Subject :NSO    Class : Class 7

Ans 1:

Anu Elizabeth Alexander from Sishya, Chennai
Class : Class 7

Ans 2:

Ahan Biswas from National Public School, Bangalore
Class : Class 8
Hydrochloric acid reacts with metals and corrodes them and is therefore stored in glass bottles... This question is wrong and so is the explanation.

Ans 3:

Tejas Agarwal from Amity International School , Noida
Class : Class 7
Q is wrong since option 1 is false, rest all are true

Ans 4:

dhairya mittal from vidyashram international school jodhpur, Jodhpur
Class : Class 5
You all are correct

Ans 5:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Hydrocloric acid is very corrosive and reacts with metals . So HCL is stored in glass bottles because it dont causes damage to it . ..........SO 3 statement should be true and their explanation is wrong .

Ans 6:

Akshara from NPS, Bengaluru
Class : Class 8
I completely agree... The HCl reacts with metals , which is major reason of why HCl is stored in glass bottles..

Ans 7:

Akshay Jha from DPS NERUL, Navi Mumbai
Class : Class 7
Yes, I also agree. HCl is a strong acid and reacts with metals almost exactly like H2S04, it is also stored in glass for this reason, question is wrong.

Ans 8:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 10
Hcl doesen't react with metals......Sulphuric acid does

Ans 9:

Aarnavi Mann from Scholars rosary Sr. Sec. School, Rohtak
Class : Class 8
Inorganic acids such as minerals acid like HCL , H2SO4 etc . Are. Not always made in factories . HCL is produced in our stomach.

Ans 10:

Deeksha Mittal from JAYPEE PUBLIC SCHOOL, NOIDA, NOIDA
Class : Class 6
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Ans 11:

Antareep Mukherjee from New Horizon Public School, Bangalore
Class : Class 8

Ans 12:

Ankush Ghosh from DPS, Doha
Class : Class 10
Hcl doesnt react with glass. The explanation is wrong

Ans 13:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
Hcl reacts with metals also

Ans 14:

Chaitanya L K from SKCHEC, bangalore
Class : Class 8
hcl reacts with metals too

Post Your Answer

Anhiti Mandal from Shri Ram School, Gurgaon
Subject :NSO    Class : Class 7

Ans 1:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7

Ans 2:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
i gave the correct answer but in the result they are showing that it is wrong.it is the same case with some other questions too.Please make a note that you correct it,thank you.

Post Your Answer

A Ramakrishna Rao from D A V Public School. Unit 8. Bhubaneswar , Bhubaneswar
Subject :NSO    Class : Class 5

Ans 1:

D Murari from Indian School of Excellence, Bangalore
Class : Class 9

Ans 2:

Risha Jakhotiya from Sanskriti School , Pune
Class : Class 3
D

Ans 3:

Kavin Karthick M from DPS bangalore east, Bengaluru
Class : Class 6
option D is correct because stapler is 3rd class lever

Ans 4:

Shruthi from VIBGYOR, Mumbai
Class : Class 6
What is type of Option A?

Ans 5:

SARVESH RAMESH from DPS MIS, QATAR
Class : Class 9

Ans 6:

Advik Wakchoure from The Shriram Universal School, Dombivli
Class : Class 5
Yes option d is correct

Ans 7:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5

Ans 8:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 9:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5
yes because the stapler is a third class lever

Ans 10:

siri from Vibgyor, Bangalore
Class : Class 6
according to Google stapler is a third-class lever

Ans 11:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
Stapler ( option D ) is the odd one out as it is a third class lever i.e. effort is between the load and fulcrum .

Ans 12:

Rohan David from Oakridge International school, Hyderabad
Class : Class 7
The answer is D because the stapler is the odd one out

Post Your Answer