National Science Olympiad Forum By SOF Olympiad Trainer

Aliva Acharya from Jawahar navodaya vidyalaya, Balasore

Subject :NSO Class : Class 7

Which of the following options correctly identifies X and Y in the given Venn diagram that represents a plant structure?

(A) X - Root, Y - Root hair

(B) X - Leaf, Y - Leaf cell

(C) X - Stem, Y - Xylem

(D) X - Leaf, Y - Phloem

Ans 1:

A Kumar from SNSVM, East Singhbhum

Class : Class 8

B is correct answer

Ans 2:

tanmay pratap singh from DAV centenary public school, Jaipur

Class : Class 7

answer is b

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Aravinda Venkatesan from Gd Goenka school indrapuram, Ghaziabad

Subject :NSO Class : Class 9

Refer to the given figure showing a process and select the correct statement regarding it.

Which of the following events also involve this process?
(i) Exchange of respiratory gases
(ii) Opening and closing of stomata
(iii) Swelling of dried raisins when soaked in water
(iv) Spreading of aroma of flowers
(v) Seismonastic movements in plants

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

give description along with this question

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Aravinda Venkatesan from Gd Goenka school indrapuram, Ghaziabad

Subject :NSO Class : Class 9

Refer to the given diagram of a type of connective tissue and select the incorrect option regarding it.

A P acts as phagocyte whereas T plays an important role during allergic reactions.
B Q provide only elasticity whereas S provides only strength.
C R secretes extracellular matrix whereas T produces a substance that checks clotting of blood inside the blood vessels.
D Q is made up of collagen protein whereas S is made up of elastin protein.

pl explain this a bit

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Aravinda Venkatesan from Gd Goenka school indrapuram, Ghaziabad

Subject :NSO Class : Class 9

The given apparatus can be used to show the diffusion of gases. Which pair of gases X and Y would cause no movement of the water?

	X	Y
A	C₂H₄	C₂H₆
B	C₂H₄	N₂
C	CO₂	C₂H₆
D	CO	NO₂

pl explain

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Sanjeev Garg from Assumption Convent School, malout

Subject :NSO Class : Class 5

Is packages are a book or digital packages

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ADITYA KUMAR from CSDAV PUBLIC SCHOOL, MOTIHARI

Subject :NSO Class : Class 9

Elements X, Y and Z have valencies 1, 3 and 4 respectively. Formula unit masses of their oxides are 62, 102 and 64 respectively. If atomic mass of Z is divided by the difference in atomic masses of X and Y then value obtained is the atomic number of which of the following elements?

ACarbon
BNitrogen
COxygen
DFluorine

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Ans 1:

Manvi Singh from Kendriya Vidyalaya Picket, Secunderabad

Class : Class 10

z/(x-y) = 32/19 is not among the option of elements given.

Ans 2:

Aditi Agrawal from Sunbeam School Bhagwanpur, VARANASI

Class : Class 9

next time

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ADITYA KUMAR from CSDAV PUBLIC SCHOOL, MOTIHARI

Subject :NSO Class : Class 9

The polynomials (ax³ + 3x³- 3) and (2x³ - 5x + a) when divided by (x - 4) leave the same remainder. Find the value of a.

A1
B3
C2
D4

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is A.

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ADITYA KUMAR from CSDAV PUBLIC SCHOOL, MOTIHARI

Subject :NSO Class : Class 9

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Ans 1:

harnoor from cambridge international school, nawanshahr

Class : Class 9

pay attention to sum of their digits

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is B.

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ADITYA KUMAR from CSDAV PUBLIC SCHOOL, MOTIHARI

Subject :NSO Class : Class 9

In a circle of radius 5 cm, AB and AC are two equal chords such that AB = AC = 6 cm. Find the length of the chord BC.

A9.8 cm
B9.6 cm
C9.2 cm
D7.3 cm

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Ans 1:

Gireesha from innocent hearts school jalandhar, Jalandhar

Class : Class 10

Ans 2:

Rohan from kennedy high the global school, HYDERABAD

Class : Class 9

9.6

Ans 3:

Ridhi Maheshwari from NLDHS, Mumbai

Class : Class 9

Can u pls send the method

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ADITYA KUMAR from CSDAV PUBLIC SCHOOL, MOTIHARI

Subject :NSO Class : Class 9

A cylindrical tub of radius 16 cm contains water to a depth of 30 cm. A spherical iron ball is dropped into the tub and thus level of water is raised by 9 cm. What is the radius of the ball?

A14 cm
B18 cm
C12 cm
D20 cm

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Ans 1:

Nirmal joshi from New Beersheba, Pithoragarh

Class : Class 9

The answer is 12cm

Ans 2:

abhijeet mishra from bhubaneswar model public school, bhubaneswar

Class : Class 10

the answer is 12 cm

Ans 3:

Nirmal joshi from New Beersheba, Pithoragarh

Class : Class 9

The answer is 12cm

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