National Science Olympiad Forum By SOF Olympiad Trainer

Paarth Vashistha from Kunskapsskolan Gurgaon , Gurgaon

Subject :NSO Class : Class 8

There are three long planks, each of length 5 meters.
Three identical balls are placed on the planks as shown in the figure.
Frictional force offered by planks I, II and III on the ball are f₁, f₂ and f₃ respectively.

If same force (push) is given to each ball then time taken to leave the planks I, II and III are 2 minutes, 1 minute and 4 minutes respectively.
Which of the following options is correct regarding the friction force offered by the planks on the ball?

Af₁ = f₂ = f₃
Bf₁ > f₂ = f₃
Cf₃ > f₁ > f₂
Df₃ < f₁ < f₂

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Shiven Sidharth from Delhi Public School Vasant Kunj, New Delhi

Subject :NSO Class : Class 3

In how many different ways can Manav reach to the Library?

A5
B7
C4
D6

There are 6 routes as per arrows given

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Ans 1:

Kashika Goel from DPS Noida, Noida

Class : Class 7

Ans 2:

Abhinha Ajay Ovhal from Podar International School, Latur

Class : Class 6

answer is d because the way can also be ABECD

Ans 3:

Aurinjay Mukhopadhyay from Future Foundation School, KOLKATA

Class : Class 5

it is b idiots

Ans 4:

Arya Shreshth from Home School, Bengaluru

Class : Class 2

it should be b

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Advait bhat from Kendriya Vidyalaya , Bangalore

Subject :NSO Class : Class 6

How many 9's are there which are preceded by 3 but not followed by 6 in the given number series?
6 9 3 9 3 6 6 3 9 5 9 3 9 6 8 9 3 9 7 3 9 6 3 9 5

A4
B8
C5
D7

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Ans 1:

Sreenidhii from Kendriya vidyalaya, DINDIGUL

Class : Class 6

4 3 9 3 3 9 5 3 9 7 69 5

Ans 2:

Lakshya from St Paul's High school , Hajipur

Class : Class 6

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Paarth Vashistha from Kunskapsskolan Gurgaon , Gurgaon

Subject :NSO Class : Class 8

Following statements are given by four students :
Rashmi : Sodium chloride is an acidic salt whereas washing soda is a basic salt.
Akshi : The aqueous solution of sugar does not change the colour of either red litmus solution or blue litmus solution.
Reema : Tamarind tastes sour whereas baking soda is bitter in taste.
Shristi : Apple juice does not change the colour of red litmus solution.
The incorrect statement(s) is/are given by

AReema and Shristi only
BRashmi only
CAkshi and Reema only
DAkshi and Shristi only.

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SAMARPAN DAS from Notre Dame Academy, Salakati Kokrajhar

Subject :NSO Class : Class 3

How many groups of 3 insects can be formed from the given insects?

A3
B4
C5
D6

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Joahanna Gabriel from Christwood school, Chennai

Subject :NSO Class : Class 8

Which of the following statement (s) is/are incorrect about Saturn ?
(i) It has 4 wide rings.
(ii) These rings are visible with the naked eyes.
(iii) Rings are made of ice and dust

A(i) only
B(ii) only
C(iii) only
D(i) and (ii)

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Siddharth Lakshmi Narayan from Greenwood High, Bangalore

Subject :NSO Class : Class 5

If 'cushion' is called 'pillow', 'pillow' is called 'mat', 'mat' is called 'mirror' and 'mirror' is called 'cover', which will be spread on the floor?

A cover
B mirror
C mat
D pillow

Pillow becomes Mat so how is the answer Mirror

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Ans 1:

Avika Goel from Delhi Public School, Navi Mumbai

Class : Class 6

No. 'Mat' becomes 'mirror' and we spread the mat over the floor so the answer is mirror.

Ans 2:

Nayanika Sadhish from CL Metha Sishya OMR, Chennai

Class : Class 8

we can put cover on anything but we definitely don't put on floor

Ans 3:

Bidyaghnya Banerjee from Vidyasagar Shishu Niketan, West Bengal

Class : Class 6

Actually, we spread cover on the floor and cover becomes mirror. . .

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Siddiqua Modi from gems modern academy, udaipur

Subject :NSO Class : Class 7

Read the given statements and select the correct option.
Statement 1 : Circular motion is the motion along a curve traced out by a moving object such that its distance from a fixed point is constant.
Statement 2 : The motion of a wheel of a moving bicycle is same as the motion of a mark on the blades of a moving electric fan.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DStatement 1 is false but statement 2 is true.

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Ans 1:

Avn lakshmi from Bvbarra, Hyderabad

Class : Class 4

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Trina from Ganges Valley School, Hyderabad

Subject :NSO Class : Class 6

If the code of COULD is BNTKC and the code of MARGIN is LZQFHM, then what is the code of MOULDING?

A CHMFINTK
B LNKTCHMF
C LNTKCHMF
D NITKHCMF

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Anamkhan Mulla from Navrachna Sama, Vadodara

Subject :NSO Class : Class 6

Shobha took two liquids (coconut oil and water) in a separating funnel as shown in the figure. What would she observe after some time?

A Layer ‘X’ is coconut oil, ‘Y’ is water and two distinct layers are formed.
B Layer ‘X’ is water, ‘Y’ is coconut oil and two distinct layers are formed.
C Layers ‘X’ and ‘Y’ are miscible to some extent, hence do not form distinct layers.
D Coconut oil is first collected in the beaker.

Easyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

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