National Science Olympiad Forum By SOF Olympiad Trainer
  1. Home
  2. Forum

User Forum

Ask Your Question
Vedika from Lotus, Gurgaon
Subject :NSO    Class : Class 2

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is A.

Count the number of total balls = 21
Count the number of crossed balls = 6
So, the subtraction sentence will be 21 - 6.
Now make the subtraction sentences for all options:
(A) 2 tens 1 one - 6 ones = 21 - 6 
(B) 2 tens 2 ones - 6 ones = 22 - 6 
(C) 2 tens - 6 ones = 20 - 6
(D) 2 tens 3 tens - 6 ones = 23 - 6


Post Your Answer

Shiven Dinkar from DPS NOIDA Sector 30, Delhi
Subject :NSO    Class : Class 3

Ans 1:

Prajwal Thakur from South Point School, Kolkata
Class : Class 3
It will be 8/56,every answer is wrong because its a proper fraction so 8/56=8/56

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is B.

Total Smileys = 56
Green Smileys = 8
Fraction of Green Smileys = 8/56 = 1/7


Post Your Answer

ATUL SANJEEV from Indian school Ghubra, Muscat
Subject :NSO    Class : Class 5

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is C

Flower changes into fruits and fruit bears seeds. Seeds give rise to new plants when sown into soil.


Ans 2:

Sumit Singhal from Cambridge Court World School, JAIPUR
Class : Class 5
but in some plants ther is no flower then also they can reproduce in a different manner

Ans 3:

Nitya from PPSD, Dombivali
Class : Class 5
Think the correct ans'rs C Cause a flower changes into a fruit in the fruit then bears seads which give rise to new plants on being down in soil. That's what I think don't know if it is right!!!

Ans 4:

CrazyRIDZ from Samhita , Bengaluru
Class : Class 5
but seeds can reproduce through stem , leaves , and root too , can't they ???

Ans 5:

Piyush Kumar Pruseth from Sri Aurobindo Integral Education and Research Centre, Rajgangpur
Class : Class 5
Flower attract the insects for pollination,so the answer is C

Post Your Answer

Anshuman Mishra from kv no 3, Bhubaneswar
Subject :NSO    Class : Class 6

Four rods of equal length and thickness but of different materials are coated with wax in the same manner. They are fixed to a trough containing hot water. The given diagram illustrates what happens to the wax on each rod after five minutes.

What can you conclude from the given diagram?
(i) The aluminium rod conducts heat better than the brass rod.
(ii) The aluminium rod conducts heat better than the copper rod.
(iii) The glass rod conducts heat better than the copper rod.
(iv) The wax on the copper rod melts faster than the wax on the brass rod.

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


Ans 1:

Manvi Mundepi from Montfort School Roorkee, Roorkee
Class : Class 7
ACCORDING TO ME THE CORRECT ANSWER IS B , FIRST WE HAVE TO UNDERSTAND THE PICTURE AND THEN ANSWER

Ans 2:

BHAVYA JHA from GLOBAL CITY INTERNATIONAL SCHOOL, BANGALORE
Class : Class 6
I too agree with you .It's B and not A

Post Your Answer

from ,
Subject :NSO    Class : Class 1

Post Your Answer

vanshaj shah from tapti valley international school , surat
Subject :NSO    Class : Class 8

Ans 1:

Mani Gupta from Carmel Convent School, Faridabad
Class : Class 9
The correct answer is D. In a transverse wave the direction of the movement of the particle is perpendicular to direction of motion of the wave. So, over here, when we move the end Q from left and right , it will produce a transverse wave,. You can check it by observing it from the top.

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is D

In transverse wave, vibration of a wave is perpendicular to its direction of propagation of wave.


Post Your Answer

Sainavaneet from Global Indian , Bangalore
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is A.

Sugar syrup is neutral and hence the colour of blue litmus and red litmus remains unchanged. Tamarind juice is acidic, so blue litmus turns red but red litmus does not change its colour. Lime water and soap solution are basic in nature which turn red litmus blue whereas blue litmus remains unchanged.


Ans 2:

Aryan Ghatti from Mount saint mary school , Delhi
Class : Class 7

Post Your Answer

Lokesh Chhabra from Lilavatibai podar high school, Mumbai
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Fish Y will be least affected as it is camouflaging with the sea weeds. Fish Y can easily escape from the predator by blending with the surrounding environment.


Post Your Answer

VV Souri from LITTLE FLOWER SCHOOL , UPPAL HYDERABAD
Subject :NSO    Class : Class 7

Ans 1:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 7
It cools towards room temperature so it does not freeze

Ans 2:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 7
Also freezing and melting point of water is 0 degrees celsius

Ans 3:

pankaj srivastava from K R mangalam world school, vaishali
Class : Class 6
b is the correct answer

Ans 4:

kashvi from Amity, noida
Class : Class 7
Three states - gas , liquid & solid When hot water temp is going down it will be ultimate become solid ie ice But before becoming ice temp will stagnant for some time where in both states liquid & solid co-exist==> some part of liquid is in ice form. X is the same state where in solid and liquid will co-exist. Hence option 4 is correct(solidification& evaporation) Note: Could not attach gif .It would have made it more clear.

Ans 5:

Pisal Dhruv from Veer Bhagat Singh International School, Mumbai
Class : Class 7
i think b is the correct answer

Ans 6:

Mohinder singh from Sacred heart convent school, Ludhiana
Class : Class 7
B is the correct answer

Post Your Answer

AHANA BAG from DELHI PUBLIC SCHOOL JOKA SOUTH KOLKATA, KOLKATA
Subject :NSO    Class : Class 3

Ans 1:

suhas from vibgyor, bangalore
Class : Class 3
The answer is gibbous moon.

Ans 2:

kalra Shaleen from Jalandhar, Jalandhar
Class : Class 3
b

Ans 3:

AHANA BAG from DELHI PUBLIC SCHOOL JOKA SOUTH KOLKATA, KOLKATA
Class : Class 4

Post Your Answer