National Science Olympiad Forum By SOF Olympiad Trainer - Page 572

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 5

Ans 2:

Class : Class 5
The answer is D

Ans 3:

Class : Class 4
I but a but it tells I put b

Ans 4:

Class : Class 9
d

Ans 5:

Class : Class 3
Ans:A...But I put D

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 5

Ans 2:

Class : Class 3
c

Ans 3:

Class : Class 5
The answer is C

Ans 4:

Class : Class 7
the answer is c}

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Subject :NSO    Class : Class 8

Ans 1:

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

Ans 2:

Class : Class 8
Thanks for the answer

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 7

Ans 3:

Class : Class 7
B should be the correct answer

Ans 4:

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

Ans 5:

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

Ans 6:

Class : Class 8

Ans 7:

Class : Class 8
B is the Wrong Answer. Protons do not move as they are fixed to their nuclei.

Ans 8:

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

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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
Solution States that "correct" answer is wrong!

Ans 2:

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 6
It's C coffee powder.

Ans 2:

Class : Class 8

Ans 3:

Class : Class 7
It's chalk powder

Ans 4:

Class : Class 8
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 5:

Class : Class 5
coffee powder

Ans 6:

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

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
The correct answer is d

Ans 9:

Class : Class 8

Ans 10:

Class : Class 9
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 11:

Class : Class 5
my actual answer is salt

Ans 12:

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

Ans 13:

Class : Class 7
Coffee powder

Ans 14:

Class : Class 3

Ans 15:

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

Ans 16:

Class : Class 5
coffee powder

Ans 17:

Class : Class 5
salt

Ans 18:

Class : Class 8
salt for the way

Ans 19:

Class : Class 7
It's chalk powder

Ans 20:

Class : Class 3
Ans-d

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Subject :NSO    Class : Class 4

Ans 1:

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 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

Class : Class 7
SEMICIRCLE5B

Ans 6:

Class : Class 8
b as there is a semi-circle

Ans 7:

Class : Class 3
ayurda 4 d 4

Ans 8:

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

Ans 9:

Class : Class 8
IT SHOULD BE 5 AS THERE IS SQUARE TRIANGLE SEMECIRCLE RECTANGLE AND DIAMOND

Ans 10:

Class : Class 5
5

Ans 11:

Class : Class 9
The answer is D) 4

Ans 12:

Class : Class 8
semicircle is there but made by square so the answer is 4

Ans 13:

Class : Class 6

Ans 14:

Class : Class 4
4 IS THE CORRECT ANSWER

Ans 15:

Class : Class 8
How 5? answer is 4The shapes are:circle,triangle,rectangle and square

Ans 16:

Class : Class 5

Ans 17:

Class : Class 4
55555555555555555555555555555555555555555 is the ans

Ans 18:

Class : Class 8
How are we supposed to know it’s a rectangle when hidden by the circle ,bonne nuit

Ans 19:

Class : Class 5
why semicircle not be counted

Ans 20:

Class : Class 5
its d

Ans 21:

Class : Class 4
5

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 9
I ALSO THINK THE ANSWER IS D

Ans 2:

Class : Class 9
The answer is A.

Ans 3:

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 4:

Class : Class 8
D

Ans 5:

Class : Class 8
Answer is D

Ans 6:

Class : Class 10

Ans 7:

Class : Class 8

Ans 8:

Class : Class 7
Answer is d

Ans 9:

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

Ans 10:

Class : Class 10
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 11:

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.

Ans 12:

Class : Class 8
The answer should be D

Ans 13:

Class : Class 8
Yes answer is D

Ans 14:

Class : Class 8

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

Ans 17:

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 18:

Class : Class 9

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