National Science Olympiad Forum By SOF Olympiad Trainer

Student from School, City

Subject :NSO Class : Class 8

As proved by many studies greenhouse effect is rapidly increasing because of increase in concentration of carbon dioxide. In the given graph the increase in carbon dioxide concentration is shown. What could be X corresponding to it?

(i) Rate of photosynthesis in plants
(ii) pH of the oceans
(iii) Water level of ocean
(iv) Average global temperature of Earth

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

There should be an option for (ii), (iii),

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Harini Kanvinde from Delhi Public School Bangalore North, Bangalore

Subject :NSO Class : Class 1

Select the option that can be placed in the same group where object X can be placed.

A
B
C
D

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Anirudh Anand from DPS, Bangalore

Subject :NSO Class : Class 5

Find the missing number, if a certain rule is followed in the given figures.

A11
B15
C21
D17

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ayush kumar from dps noida, delhi

Subject :NSO Class : Class 3

Refer to the given diagram and select the correct option regarding it.

AX - Rubber, Y - Plastic
BZ - Wood, X - Cardboard
CY - Sponge, X - Rubber
DZ - Glass, X - Paper

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Ans 1:

Kashika Goel from DPS Noida, Noida

Class : Class 7

only D is correct

Ans 2:

Avneet Kaur from Satpaul Mittal School , Ludhiana

Class : Class 3

Ans 3:

Deborah Charles from Vydehi school of Excellence, Bengaluru

Class : Class 4

Ans 4:

SAMARPAN DAS from Notre Dame Academy, Salakati Kokrajhar

Class : Class 6

Both (A) and (D) are correct.

Ans 5:

Kashika Goel from DPS Noida, Noida

Class : Class 7

plastic is or not flexible. It depends on the type of plastic material

Ans 6:

Aradhya Shankar from Vibgyor, Kolhapur

Class : Class 4

No it is AAAAAAAAAa they are wrong

Ans 7:

Kashika Goel from DPS Noida, Noida

Class : Class 7

no

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Devesh Kumar Shrivastava from Ramjas School, Pusa Road, New Delhi

Subject :NSO Class : Class 6

How many such odd numbers are there in the given arrangement each of which is not immediately followed by a multiple of 2?
8 4 3 2 4 6 3 1 5 4 2 3 2 4 6 4 8 1 3 2 4 2 6 4 8

A4
B3
C2
DNone of these

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Utsav from podar international school , shivamoga

Subject :NSO Class : Class 8

Match different terms in column I with their related description in column II and select the correct option from the codes given below.

Column I	Column II
(A) Weeding	(i) Loosening and turning of soil
(B) Threshing	(ii) Removing unwanted plants from a field
(C) Tilling	(iii) Cutting and gathering of mature crop
(D) Harvesting	(iv) Separation of grain from the chaff

A (A) - (i), (B) - (iii), (C) - (ii), (D) - (iv)
B (A) - (ii), (B) - (i), (C) - (iv), (D) - (iii)
C (A) - (ii), (B) - (iv), (C) - (i), (D) - (iii)
D (A) - (iv), (B) - (iii), (C) - (i), (D) - (ii)

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Ans 1:

Dhruv rane from St Joseph convent school, Jalgaon

Class : Class 8

Ans 2:

Anidhya Pandey from St.Mary's Convent School, GHAZIABAD

Class : Class 8

BUT IN THE SYPNOSIS PLOUGHING IS DEFINED AS THE PROCESS OF LOOSENING AND TURNING OF SOIL

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timaan from sanskriti, delhi

Subject :NSO Class : Class 9

A tank 2 m high is half filled with water and then filled to the top with oil of density 0.60 g/cc. What is the pressure at the bottom of the tank due to these liquids?
(Take g = 10 m s^-2)

A 0.8 × 10² N m^-2
B 0.8 × 10⁴ N m^-2
C 1.6 × 10² N m^-2
D 1.6 × 10⁴ N m^-2