National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 8

Read the given statements and select the correct option.
Statement 1 : While drawing a line on a paper, friction force acts on paper in the same direction along which line is drawn on the paper.
Statement 2 : Friction always opposes motion.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true and statement 2 is false.
D Both statements 1 and 2 are false.


I don't understand how statement 1 is true

Ans 1:

Class : Class 8
IT 'S ANSWER SHOULD BE D?

Ans 2:

Class : Class 9
But friction always opposes motion...then how are they saying that option c is true?

Ans 3:

Class : Class 8
All the options must be incorrect as friction always opposes motion and friction acts in direction opposite of force applied but there is no option saying this

Ans 4:

Class : Class 8
Yes , I also agree that friction always opposes motion and the following options are incorrect as *Statement 1* is incorrect and *Statement 2* is correct. There is surely some error.

Ans 5:

Class : Class 10
not in all cases friction opposes, this is proved from statement 1 as friction acts backward on the paper and it will act forward on the direction where the pencil is moved

Ans 6:

Class : Class 8
You

Ans 7:

Class : Class 5
all the options are incorrect as statement 1 is false and statement 2 is true.so the answer should look like:(iv)none of these

Ans 8:

Class : Class 9
Friction always opposes motion but while drawing a line on a paper, the frictional force acts in the opposite direction in which the tip of the pen acts / the line is drawn. I think all options are incorrect as 'statement 1' is wrong but 'statement 2' is right

Ans 9:

Class : Class 10
YES THERE IS A LOT OF ERROR IN THE OPTIONS

Ans 10:

Class : Class 5
In my opinion statement 2 is true and statement 1 is false as friction always opposes the motion of an object. Also the friction between the pencil and paper should be exerted in the opposite direction.

Ans 11:

Class : Class 8
It should be E first statement is incorrect while second statement is correct.

Ans 12:

Class : Class 9

Ans 13:

Class : Class 9
No statement 1 is correct where as statement 2 is also correct

Ans 14:

Class : Class 5
statement 1 is falsewhereas statement 2 should be true

Ans 15:

Class : Class 5

Post Your Answer

Subject :NSO    Class : Class 5

Post Your Answer

Subject :NSO    Class : Class 4

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Class : Class 1
The correct answer is D.

Post Your Answer

Subject :NSO    Class : Class 4

Mr Wadhera thought that his garden dried out most quickly when it was hot and windy. He decided to investigate. He watered his dry garden on four different mornings for 10 min at 8 am using the same amount of water.
What should be the weather conditions for four subsequent days to get a fair test?


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


explain

Ans 1:

Class : Class 4
they have not given the solution........ please explain

Ans 2:

Class : Class 1
Please explain. .....

Ans 3:

Class : Class 3
I agree with Harish Divakar and Ridhima . The ans is b

Ans 4:

Class : Class 4

Ans 5:

Class : Class 6
So, for an experiment you need multiple values for comparison. This question states that the experiment is to be carried out for four days, meaning that you need to compare four different scenarios. The first one is obviously hot and windy. The four scenarios- hot, windy, calm and cloudy must be paired with each other forming these- hot and windy, hot and calm, windy and cloudy, cloudy and calm- option B

Ans 6:

Class : Class 5

Ans 7:

Class : Class 5
dude i asked you to explain .Not give the answers because you have done it before.[i am talking to you only, Shaurya uniyal]

Ans 8:

Class : Class 3
I think it is B?.?.

Ans 9:

Class : Class 5
Please somebody explain.

Ans 10:

Class : Class 4

Ans 11:

Class : Class 5
The meaning of the symbols is not clear.

Ans 12:

Class : Class 6
C

Ans 13:

Class : Class 6
I don't understand the guestion. Can somebody explain.

Ans 14:

Class : Class 4

Ans 15:

Class : Class 8

Ans 16:

Class : Class 4

Ans 17:

Class : Class 5

Ans 18:

Class : Class 5
please somebody explain......They have not given the solution.............

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

Ans 2:

Class : Class 5
Hey ! I wrote B only ! They changed my answer !

Ans 3: (Master Answer)

Class : Class 1
The correct answer is B.

Ans 4:

Class : Class 6

Post Your Answer

Subject :NSO    Class : Class 5

A ship is made of iron but still it floats in water. This is because of its shape. A ship is hollow in the middle. When it is in water, the entire volume of the ship, including the hollow portion displaces water to make space for itself. The volume of water displaced is much more than the volume of iron in the ship. Therefore, the ship floats in water.
In the above passage, the floatation of ship is being described with ______ principle.

A Newton's
B Archimedes'
C G auss'
D Both A and B


Ans 1:

Class : Class 7
B is the answer

Ans 2:

Class : Class 5
What is the meaning of archimedes[']

Ans 3:

Class : Class 7
B is the answer

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
i

Post Your Answer

Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
c c c c c c c c c c c c c c c c c c c c c

Ans 2:

Class : Class 4
i Do Not KNOW North South East West

Ans 3:

Class : Class 5
The correct answer is C.

Ans 4:

Class : Class 3
D

Ans 5:

Class : Class 3
C is the right answer

Ans 6:

Class : Class 1
C

Ans 7:

Class : Class 5
ANS:C As the sunset in the west the shadow will fall in the east side. so the park would have most shade is Park R

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
OPTION D) IS CORRECT AS WATER IS INEXHAUSTIBLE,FOREST IS EXHAUSTIBLE,METAL IS RECYCLABLE. AND FOSSIL FUEL CANNOT BE RECYCLED AND IT TAKES MILLIONS OF YEARS TO FORM

Ans 2:

Class : Class 7
d

Ans 3:

Class : Class 9
OPTION B IS RIGHT

Ans 4:

Class : Class 7
B

Post Your Answer