National Science Olympiad Forum By SOF Olympiad Trainer

Om Butani from Global Indian International School, Ahmedabad

Subject :NSO Class : Class 8

Refer to the given passage and answer the following questions. Two concrete rectangular blocks 1 and 2 have dimensions as shown in figures. Standing on one of its faces as shown, the pressure exerted by block 1 is P. Both the blocks are made of same material.

What is the pressure exerted by block 2 when it stands on the face as shown in figure ?

A(x/2z)p
B(z/x)p
C(x/y)p
D(2y/z)p

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Prathamesh from DPS bhilai, Bhilai

Class : Class 9

how did you get z at bottom of 2y

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Sharvari Joshi from VIBGYOR High Balewadi, Pune

Subject :NSO Class : Class 8

Petroleum contains a large number of components having different boiling points. They are separated by fractional distillation as shown in the given figure : The boiling point range of few fractions of petroleum is given in the table.

Identify P, Q, R and S.

-------- P---------Q---------R---------S
AFuel oil--Diesel--Kerosene--Petrol
BKerosene--Petrol--Fuel oil--Diesel
CPetrol--Kerosene--Diesel--Fuel oil
DDiesel--Fuel oil--Petrol--Kerosene

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Om Butani from Global Indian International School, Ahmedabad

Subject :NSO Class : Class 8

Ms. Abha, a science teacher demonstrated three experiments in lab as follows :

Which of the following observations and inferences drawn is/are correct?

AI and II only
BII and III only
CIII only
DI only

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Ans 1:

Om Butani from Global Indian International School, Ahmedabad

Class : Class 8

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Bhagyesh Kamal from DPS, Mumbai

Subject :NSO Class : Class 8

The given diagram shows changes in uterine lining during a menstrual cycle (divided in five phases, a to f).
(i) When release of the egg from the ovary is expected to happen?
(ii) When menstruation is expected to occur?
(iii) If the egg gets fertilized, when implantation of embryo is expected to occur?

A i-d, ii-a to b, iii- e to f
B i-c to d, ii-e to f, iii- a to b
C i-c, ii-a to b, iii- d to e
D i-d to c, ii-c, iii- e to f

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from d.g.v. sr. sec. school, rohtak

Subject :NSO Class : Class 9

Refer to the given dichotomous key and answer the following questions.
I. (A) The cells of tissue have walls. -Go to II
(B) The cells of tissue have no walls.
-Go to III
II. (A) The cells are living. - Go to IV
(B) The cells are dead. - Go to V
III. (A) The tissue lines the oviducts. - R
(B) The tissue transports nutrients. - S
IV. (A) Cells store air. - P
(B) The tissue conducts nutrients. - Q
V. (A) The tissue conducts water. - T
(B) It is only a mechanical tissue. - U
Select the incorrect option regarding tissues P, Q, R, S, T and U.

A P is found in aquatic floating plants whereas T is greatly reduced or absent in aquatic plants.
B R and S are animal tissues while P and Q are plant tissues.
C S can be xylem, Q can be blood and U can be parenchyma.
D R is ciliated epithelial tissue whereas U possesses uniform wall thickenings of lignin.

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Ans 1:

Aksh Raghuvanshi from KV Hebbal, Bengaluru

Class : Class 9

Ans 2:

Ishaan from Vibgyor, Bengaluru

Class : Class 9

Ans 3:

ANIKA SHUKLA from UDGAM SCHOOL FOR CHILDREN, AHMEDABAD

Class : Class 10

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Om Butani from Global Indian International School, Ahmedabad

Subject :NSO Class : Class 8

The given table shows some properties of four substances P, Q, R and S.

Study the table carefully and identify P, Q, R and S.

	P	Q	R	S
A	Sodium	Iron	Gold	Copper
B	Calcium	Aluminium	Phosphorus	Gold
C	Potassium	Zinc	Graphite	Aluminium
D	Sodium	Magnesium	Copper	Iron

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Student from School, City

Class : Class 8

Potassium does not react with water

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Vedant from DON BOSCO, CHENNAI

Subject :NSO Class : Class 4

Study the given figure and answer the following questions.

After making a 1/2 clockwise turn followed by 5/8 anti-clockwise turn, Rahul is facing the Church. Where was he facing before he made the turns?

AMall
BAirport
CHospital
DLibrary

klj

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Ans 1:

Devansh from Narayana E-Techno School , Mumbai

Class : Class 5

Ans 2:

Goutham from lt, Chennai

Class : Class 4

Who knows? only heaven knows.

Ans 3:

Shivansh Mittal from Apeejay School, Faridabad

Class : Class 4

How ?

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AKSHAT AGRAWAL from NPS, BANGALORE

Subject :NSO Class : Class 6

Refer to the given flow chart and select the incorrect statement regarding P, Q and R.

A If P is an adventitious root then it could be sweet potato, whereas if P is a tap root then it could be turnip.
B Q could be stilt root found in sugarcane or prop root found in banyan tree.
C R is found in money plant and betel.
D Q and R are modifications of tap root whereas P is a modification of adventitious root only.

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Hima Devireddy from Phoenix , Hyderabad

Subject :NSO Class : Class 5

Match column I with column II and select the correct option from the given codes.

A a - (ii), b - (iii), c - (iv), d - (i)
B a - (iv), b - (iii), c - (i), d - (ii)
C a - (ii), b - (i), c - (iii), d - (iv)
D a - (iii), b - (iv), c - (ii), d - (i)

the right answer is a,b,c,d

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Saharsh Goud from Delhi Public School Bangalore East, Bengaluru

Subject :NSO Class : Class 8

Which one of the following statements is not correct?

ADispersion can easily be demonstrated using a convex lens.
BA spectrum is formed when white light is dispersed.
CViolet light dispersed the most while passing through a triangular prism.
DDispersion demonstrates that white light can be broken up.

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