National Science Olympiad Forum By SOF Olympiad Trainer

Amar from AJ School, Navi Mumbai, Mumbai

Subject :NSO Class : Class 6

A typical flower has a stalk called P. The uppermost part of stalk is wider and is known as Q. On the top of Q different whorls are present. The outermost whorl consists of green leaf-like structures called R. The inner whorl consists of S which are brightly coloured and scented.
What are P, Q, R and S ?
P-----Q-----R-----S
(a) Thalamus-----Pedicel-----Petals-----Sepals
(b) Pedicel-----Thalamus-----Petals-----Sepals
(c) Pedicel-----Thalamus-----Sepals-----Petals
(d) Thalamus-----Pedicel-----Sepals-----Petals

good

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Dhwani Bamo from BGS International Public School, New Delhi

Subject :NSO Class : Class 5

Manomay conducted an experiment where 4 identical metal balls were allowed to roll down 4 similar curves with surfaces of different texture. The time taken for the ball to come to a complete stop for each of the different surfaces was recorded in the table below.

Which curve has the roughest surface?

A P
B Q
C R
D S

How can the roughest surface allow lesser stopping time? Answer to this question should be R. Please advise

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Ans 1:

ritvik from VIDYA SHREE INTERNATIONAL SCHOOL rohtak, rohtak

Class : Class 6

s is the correct answer because it takes the shortest time to stop

Ans 2:

bijendra bidrohi from ,

Class : Class 5

S

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namay rohatgi from apeejay school,noida, New Delhi

Subject :NSO Class : Class 6

Arrange these as first, second and third class levers?

AA, B, C
BB, A, C
CC, B, A
DC, A, B

plzz explain

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Ans 1:

param ahuja from m.p.s, Ajmer

Class : Class 9

a

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ARCHIT PATIL from KASHINATH PALOD PUBLIC SCHOOL JALGAON, Jalgaon

Subject :NSO Class : Class 5

The young plant shown here was grown from a seed that most likely came from which of the following plants?

(A)

(B)

(C)

(D)

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huzaifa from kendriye vidayalaya sanghathan, New Delhi

Subject :NSO Class : Class 8

An equilibrium state of a body is considered if all the forces acting on it

A are in the same direction
B are equal in magnitude
C have zero resultant
D can be arranged in pairs.

please help me what is equilibrium

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Ans 1:

Ridhi Goyal from DAV Public School, Ludhiana

Class : Class 9

state of rest is equilibrium so answer is when resultant force is zero

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Ishana Dash from VIDYASAGAR SHISHU NIKETAN, Midnapore

Subject :NSO Class : Class 6

the question is incomplete

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Kush Malpani from Cathedral and John Connon Senior School, Mumbai

Subject :NSO Class : Class 6

Which pair shows correct match of organism with its breathing organs?

ADolphin-Blow holes
BSnake-Moist skin
CEarthworm-Spiracles
DWhale-Gills

how is it option adolphins don't have blowholes

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Dipam from Podar International School, Aurangabad

Subject :NSO Class : Class 5

Which of the following would NOT help in soil conservation?
(A) Building embankments

(B) Terrace farming

(C) Afforestation

(D) Overgrazing by cattle

Answer: (D) Over grazing by cattle will not help in soil conservation but will result in soil erosion. As plant roots hold the soil tightly thus they prevent its erosion. When plant over is removed by overgrazing, soil erodes away.

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Arin Weling from ,

Subject :NSO Class : Class 7

Which of the following statements is false regarding physical and chemical properties?

A The composition of matter need not be changed for observing a physical change.
B During a chemical reaction, molecules undergo a change and their concentration keeps decreasing along with time.
C Chemical property is the ability of matter to undergo some chemical change because of its composition.
D During a chemical reaction, same molecules are present throughout the change.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

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Arin Weling from ,

Subject :NSO Class : Class 7

Sakshi performs a chemical reaction in the laboratory. The change in the position of the molecules is represented in the given figure.

Which of the following chemical reactions was performed by Sakshi?

ACaO (aq) + CO₂ (g)--->CaCO₃ (aq)
B2H₂ (g) + O₂(g)--->2H₂O (l)
CNa (s) + O₂(g) ---> Na₂O (s)
DH₂(g) + Cl₂(g)---> 2HCl (g)