National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 2

Ans 1: (Master Answer)

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

Subject :NSO    Class : Class 3

Ans 1:

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)

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

Subject :NSO    Class : Class 5

Ans 1: (Master Answer)

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:

Class : Class 5
but in some plants ther is no flower then also they can reproduce in a different manner

Ans 3:

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:

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

Ans 5:

Class : Class 5
Flower attract the insects for pollination,so the answer is C

Post Your Answer

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:

Class : Class 7
ACCORDING TO ME THE CORRECT ANSWER IS B , FIRST WE HAVE TO UNDERSTAND THE PICTURE AND THEN ANSWER

Ans 2:

Class : Class 6
I too agree with you .It's B and not A

Post Your Answer

Subject :NSO    Class : Class 1

Post Your Answer

Subject :NSO    Class : Class 8

Ans 1:

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)

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

Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

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:

Class : Class 7

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

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

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
It cools towards room temperature so it does not freeze

Ans 2:

Class : Class 7
Also freezing and melting point of water is 0 degrees celsius

Ans 3:

Class : Class 6
b is the correct answer

Ans 4:

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:

Class : Class 7
i think b is the correct answer

Ans 6:

Class : Class 7
B is the correct answer

Post Your Answer

Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
The answer is gibbous moon.

Ans 2:

Class : Class 3
b

Ans 3:

Class : Class 4

Post Your Answer