National Science Olympiad Forum By SOF Olympiad Trainer - Page 518

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Subject :NSO    Class : Class 3

Beena, Shalu and Navpreet wanted to find out who among them had the biggest lung capacity. They decided to blow into a balloon with one breath and see how big it will become. Which of the following factors they must keep the same to make the test a fair one?
1. Colour and design pattern of the balloon
2. Size and shape of the balloon
3. When to breathe in forcibly before blowing
4. Material, balloon is made of

A 1 and 2 only
B 2 and 3 only
C 1, 3 and 4 only
D 2, 3 and 4 only


The answer is D

Ans 1:

Class : Class 5
The answer is D

Ans 2:

Class : Class 4
d

Ans 3:

Class : Class 5

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 5
The answer is C

Ans 2:

Class : Class 5

Ans 3:

Class : Class 3
the answer is c}

Ans 4:

Class : Class 3
c

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
Thanks for the answer

Ans 2:

Class : Class 8
It is polyester and not polythene. Therefore B is the right answer. Rayon IS regenerated from wood pulp.

Ans 3:

Class : Class 10

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 7
B is wrong, as protons cannot move from their positions in an atom.

Ans 2:

Class : Class 8

Ans 3:

Class : Class 7
B should be the correct answer

Ans 4:

Class : Class 10
B is correct answer because,as we know protons are heavy and dont move but due to the movement of electrons protons are pushed towards the opposite direction

Ans 5:

Class : Class 9
Option (D), electrons move from left to right & the protons are stable in the nucleus and they never move.

Ans 6:

Class : Class 6

Ans 7:

Class : Class 5
B is the Wrong Answer. Protons do not move as they are fixed to their nuclei.

Ans 8:

Class : Class 8
B is the correct answer, as the protons might be a part of the nucleus, but the nucleus as a whole is a positively charged particle as well, therefore, it moves to right

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
Ans is A because of this relationship: Sedimentary : Metamorphic : Igneous

Ans 2:

Class : Class 6
Ans is A because of this relationship: Sedimentary : Metamorphic : Igneous

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
Option A

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
Explanation in the solution is not matching any options. According to explanation option one and three are correct.

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 7
Coffee powder

Ans 2:

Class : Class 5
coffee powder

Ans 3:

Class : Class 3

Ans 4:

Class : Class 5
my actual answer is salt

Ans 5:

Class : Class 9
The correct answer is C . It will be coffee power.

Ans 6:

Class : Class 6

Ans 7:

Class : Class 4
The answer is D because D cant desolve in water while others can.So the answer is D.

Ans 8:

Class : Class 5
salt

Ans 9:

Class : Class 6
It's C coffee powder.

Ans 10:

Class : Class 7
It's chalk powder

Ans 11:

Class : Class 5
why is chalk powder the correct answer?

Ans 12:

Class : Class 7
It's chalk powder

Ans 13:

Class : Class 6
The correct answer is d chalk powder because it is insoluble in water while the rest are not.

Ans 14:

Class : Class 7
Coffee Coffee Coffee Coffee Calls out Calls out the answer is C in the answer it is me it is me it is me

Ans 15:

Class : Class 5
coffee powder

Ans 16:

Class : Class 8
chalk powder is insoluble in water while others are soluble, chalk powder can be separated from water by sedimentation and decantation or filtration but others need evaporation...… Now I think Harsh you understood why the answer is D!!

Ans 17:

Class : Class 3
Ans-d

Ans 18:

Class : Class 8
salt for the way

Ans 19:

Class : Class 5

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 7
the answer can even be 'B' as semi-circle is there ,made by square

Ans 2:

Class : Class 4
4 IS THE CORRECT ANSWER

Ans 3:

Class : Class 4
55555555555555555555555555555555555555555 is the ans

Ans 4:

Class : Class 6
all listen it should be 5 as i think because the rectangle is dividing the circle into two halves which is forminig a semi circle and if sof has to 4 which means that it should be a whole shape like circle triangle etc.so if it is wholes shape SOF is right or elseNiteen Jit Sahu and all others who say semi circle are right

Ans 5:

Class : Class 7
Can you tell the answer of this question

Ans 6:

Class : Class 4
5

Ans 7:

Class : Class 8
its d

Ans 8:

Class : Class 7
There is no semicircle.Answer is 4.

Ans 9:

Class : Class 7
b as there is a semi-circle

Ans 10:

Class : Class 7
semicircle is there but made by square so the answer is 4

Ans 11:

Class : Class 7
SEMICIRCLE5B

Ans 12:

Class : Class 5

Ans 13:

Class : Class 7
How 5? answer is 4The shapes are:circle,triangle,rectangle and square

Ans 14:

Class : Class 6

Ans 15:

Class : Class 4
How are we supposed to know it’s a rectangle when hidden by the circle ,bonne nuit

Ans 16:

Class : Class 5
5

Ans 17:

Class : Class 8
The answer is D) 4

Ans 18:

Class : Class 3
ayurda 4 d 4

Ans 19:

Class : Class 5
why semicircle not be counted

Ans 20:

Class : Class 7
5 is the answer because there is even semi circle there with rectangle,square and triangle.

Ans 21:

Class : Class 6
IT SHOULD BE 5 AS THERE IS SQUARE TRIANGLE SEMECIRCLE RECTANGLE AND DIAMOND

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
I think that option "D" is the correct answer as friction is always opposite to direction of motion of the object

Ans 2:

Class : Class 10

Ans 3:

Class : Class 9
The correct answer is d as friction acts opposite to the direction of the applied force

Ans 4:

Class : Class 9

Ans 5:

Class : Class 8
Answer is D

Ans 6:

Class : Class 8
D

Ans 7:

Class : Class 7
Answer is d

Ans 8:

Class : Class 9
see guys, i think u all are mistaken. We dont consider in what direction the car is going, but in which direction the wheel is turning. for the car to go forwards, the wheel must roll clockwise. so for the car to go east, wheel must roll in the clockwise direction. Now consider a very small part of the wheel which is touching the ground. to wheel to roll in clockwise direction , that small part must slide backward, and that must continously happen in order for wheel to turn clockwise and car to go in east direction. And u know, friction is b/w the surface in contact, i.e the rolling part of the wheel, not with the car. so friction should oppose the backward-going part of the wheel, and thus in the ame direction with the motion of the car. if friction were to be in west, the car would never go in east direction, because the wheel would'nt have any force to oppose, to make it go in that direction, and thus the car would never be able to go towards the east direction!

Ans 9:

Class : Class 8

Ans 10:

Class : Class 8
the answer is D but is given wrong in this question .

Ans 11:

Class : Class 8
Yes answer is D

Ans 12:

Class : Class 9
The answer is A.

Ans 13:

Class : Class 8
How can the direction of friction be towards east? It should always act in the direction opposite to that of the direction of the moving body, i.e., friction should act towards the west irrespective of whether the vehicle is accelerating or retarding. So the correct answer should be D!

Ans 14:

Class : Class 8
The answer should be D

Ans 15:

Class : Class 9
I'm confused about the same thing...friction opposes relative motion, so it will obviously be towards west??

Ans 16:

Class : Class 8

Ans 17:

Class : Class 9
I ALSO THINK THE ANSWER IS D

Ans 18:

Class : Class 8
the answer has to be d because friction always oppose the relative motion of an object no matter if it accelerates or not.

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