National Science Olympiad Forum By SOF Olympiad Trainer

Mahadevan from KV Rubber Board Kottayam, Kottayam

Subject :NSO Class : Class 5

Which of the following numbers will replace the (?) to continue the pattern given below?

A130
B238
C230
D300

what is the explantion of this

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Aarnav Grover from Anand Niketan Shilaj, Ahmedabad

Subject :NSO Class : Class 4

Refer to the given figure and select the correct statement regarding P, Q, R and S.

AQ is the layer in which we live whereas P is the layer of molten iron and magnesium.
BR is iron rich inner core whereas S is nickel-iron rich outer core.
CR is in liquid state whereas S is in solid state.
DP is made up of gases whereas R is made up of rocks.

c is the answer

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

C

In the given figure P, Q, R and S represent different layers of Earth, i.e., crust, upper mantle, lower mantle, outer core and inner core respectively.

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Sanaya Singh from Hiranandani Foundation, Mumbai

Subject :NSO Class : Class 2

Match column I with column II and select the correct option.

A (A)-3, (B)-2, (C)-1, (D)-4
B (A)-2, (B)-1, (C)-4, (D)-3
C (A)-3, (B)-4, (C)-1, (D)-2
D (A)-2, (B)-4, (C)-1, (D)-3

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Ans 1:

Rudranksh Chiranjib Guha from Sri Sri Ravishankar Vidya Mandir, Mulund, Mumbai

Class : Class 4

ddddddddddddddddddddddddddddddddddddddddddddddddddddddddDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

Ans 2:

Arjyayan Sarkar from Garden High School, Kolkata

Class : Class 2

D

Ans 3:

Abhiraj from St. Xavier's School, Burdwan

Class : Class 7

D

Ans 4:

Sanaya Singh from Hiranandani Foundation, Mumbai

Class : Class 2

Ans 5:

Aashi Adwita from Delhi Public School , Secunderabad

Class : Class 4

D

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Adhithi from ISG, Muscat

Subject :NSO Class : Class 8

Natasha put a plant cell and an animal cell of similar size in two similar dishes containing the same amount of water overnight. The next day, she observed the cells under the microscope and noticed that the animal cell has burst and the plant cell looked more bloated. She drew the following conclusions:
(i) The animal cell has only a thin layer of cell membrane. When too much water enters it, it bursts.
(ii) Plant cell has cell wall made up of cellulose which is very strong material and prevents the cell from bursting.
(iii) The plant cell contains vacuole and therefore can absorb more water.
(iv) The animal cell does not possess vacuole.
Which of the above given conclusions are correct?

A(i) and (ii)
B(iii) and (iv)
C(i), (ii) and (iii)
DAll of these

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

A

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Tay Wen Xuan from Inspiros International School, SHAH ALAM

Subject :NSO Class : Class 9

Find the number of triangles formed in the given figure.

A33
B37
C35
DNone of these

I think the solution missed 4 triangles, so the answer should be (A) instead of (D).

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Chirag Khandelwal from D.A.V International School, Ahmedabad

Class : Class 10

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ARYAN PANDHI from AHMEDABAD INTERNATIONAL SCHOOL, AHMEDABAD

Subject :NSO Class : Class 5

Rajendra is standing at a point X in the given figure. He is facing the School. How many degrees must he turn anticlockwise to face the Market?

A90°
B180°
C135°
D225°

bb

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Sreejani Bhaduri from National Public School, Bangalore

Class : Class 10

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Tay Wen Xuan from Inspiros International School, SHAH ALAM

Subject :NSO Class : Class 9

Select a figure from the given options, which will continue the series established by the Problem Figures.

A
B
C
D

How do you get this??

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Sampurna Mandal from DAV Public School Jagganath Talcher, Angul

Subject :NSO Class : Class 8

Read the given statements and select the correct option.
Statement 1 : It takes a much longer time and covers more distance to stop a moving ship in water than a moving car with same speed on the road.
Statement 2 : The friction on water surface is much less than the solid surface.

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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Yakshita Rathor from Divine Child, Mumbai

Subject :NSO Class : Class 9

Select the correct statement regarding cell wall of plant cells.

APrimary cell wall is chiefly composed of a soluble fibrous polysaccharide called suberin.
BSecondary cell wall is mainly composed of lignin and is deposited on the outer surface of primary wall.
CPits are present in primary walls whereas they are absent in secondary walls.
DThe primary cell walls of adjacent cells are cemented through middle lamella which is composed of calcium and magnesium pectate.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

D

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Mrigank Arora from The Modern School, delhi

Subject :NSO Class : Class 3

Neetu took equal amount of three types of soil X, Y and Z in three different troughs. Then, she poured 100 mL of water in each trough. The results obtained after some time are shown below.

Now, select the INCORRECT option regarding this.

ASoil X is most suitable for making pots.
BSoil Y is most suitable for making base of an artificial pond.
CPlants like cactus can grow well in soil Z.
DSoil X is suitable for growth of most plants.