National Science Olympiad Forum By SOF Olympiad Trainer

madhu from sanskriti, new delhi

Subject :NSO Class : Class 7

Three salt solutions are given as:
X : Potassium sulphate solution
Y : Sodium carbonate solution
Z : Ammonium sulphate solution
Which of the following statements is incorrect regarding these salt solutions?

AX will have same effect on red litmus paper as the common salt solution.
BY will have same effect on turmeric paper as the milk of magnesia.
CAmmonium sulphate will have same effect on blue litmus paper as the lemon juice.
DNone of these

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Ans 1:

Satwik Dixit from Christ Academy, Bangalore

Class : Class 7

Ans 2:

Arnav Raju Ghungal from Mount Carmel international school akola, mothi lokende layout akola

Class : Class 7

Ans 3:

Aadya from Gma, Dubai

Class : Class 7

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Aditri Dixit from TCIS, Bangalore

Subject :NSO Class : Class 3

Select the tool that measures in the unit of kilogram.

A
B
C
D

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

C

Kilogram is the unit of measuring weight which is measured by a weighing balance.

Ans 2:

Avighna Shastri from doha modern indian school, doha

Class : Class 2

c of course!!!!!!!!!!!!!

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Aditri Dixit from TCIS, Bangalore

Subject :NSO Class : Class 3

Match the columns and select the correct option.

Column I	Column II
(A) It takes the shape of its container.	1. Solid
(B) It has a fixed shape.	2. Liquid
(C) If you freeze a liquid it will become this.	3. Gas
(D) If you boil a liquid it will become this.

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

View All Answers (6)

Ans 1:

Avighna Shastri from doha modern indian school, doha

Class : Class 2

Ans 2:

Snigdha Agarwal from The Khaitan School, Noida

Class : Class 7

It should be A

Ans 3:

Anushtubh Ashish Sonawane from Blue Ridge Public School, Pune

Class : Class 5

b!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 4:

Hamsini from yagappa international school, Thanjavur

Class : Class 6

Ans 5:

Santina Suzanne from owis, bangalore

Class : Class 4

I got 20 out of 20!!!!!!!!!!!!!!!!!!!!!!

Ans 6:

Aditri Dixit from TCIS, Bangalore

Class : Class 3

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Bhavya from ABC, Delhi

Subject :NSO Class : Class 5

Refer to the given Venn diagram and select the incorrect statement regarding X, Y and Z.

A X could be an incurable disease that damages immune system of the infected person.
B Disease Y could be effectively treated by antibiotics.
C Z could be a disease in which blood platelet count of a person goes down significantly.
D Both X and Y could be communicable diseases, of which Y could get cured on its own.

the answer will be 'B' because virus can't be treated by antibiotics.

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Ans 1:

Bhavya Agrawal from Cambridge Court High School , JAIPUR

Class : Class 8

you are correct abhiraj

Ans 2:

Bhavya from ABC, Delhi

Class : Class 7

the answer will be 'b' because virus can't be treated by antibiotics.

Ans 3:

kushaal srinandan reddy bandi from bhartiya vidya bhavans public school vidhyasharam jublee hills , HYDERABAD

Class : Class 6

it should be c

Ans 4:

Divyanshi from United international School, Bangalore

Class : Class 6

Yeah

Ans 5:

Bhavya from ABC, Delhi

Class : Class 7

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Dushyant Singh from Shri Ram Centennial School, Indore

Subject :NSO Class : Class 5

The given graph shows the changes in level of pollution in an area over a time period.

Which of the following can be inferred from the given graph?

AAt point P a lot of forest land was cleared for human consumption whereas at point Q large scale afforestation was done.
BAt point R a new factory was set up in the area.
CPeople cut down the use of fossil fuels in the interval S - T as compared to its earlier usage.
DIntervals R - S and T - U indicate activities like use of bioinsecticides and biopesticides instead of chemicals in farming, use of public transport instead of private transport, etc.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

D

Use of bio-insecticides and bio-pesticides will bring down the pollution level, and Intervals R – S and T – U show the pollution levels coming down.

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Shreeniketh E R from Sri kumaran childrens home, bangalore

Subject :NSO Class : Class 8

It is possible to make a meaningful word with the second, the third, the ninth, the tenth, the thirteenth, the fourteenth and the eighteenth letters of the word COUNTERINTELLIGENCE, using each letter only once, except the second letter, which should be used twice, which of the following will be the third letter of that word? If no such word can be formed give 'X' as the answer, and if only two such words can be made give answer 'Y'. And if more than two such words can be formed give answer 'Z'.

A C
B X
C Y
D Z

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Ans 1:

Chaitanya from Mount Olympus school , Gurugram

Class : Class 8

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Akfit from Potty, Dilli

Subject :NSO Class : Class 10

Humans inherit colour of their eyes from their parents. Brown-eyed couple has three blue-eyed children. Which of the following statements gives correct explanation of this situation?
(i) Each parent has an allele for brown eyes and an allele for blue eyes.
(ii) The allele for blue eyes is recessive.
(iii) The probability that their next child will have blue eyes is 0.75.
(iv) The probability that their next child will have brown eyes is 0.5.

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

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Can I get Rank 35 darryl from Global Indian international school, Brawl stars

Subject :NSO Class : Class 6

A scientist conducted a study on four different species of organisms P, Q, R and S in a terrestrial food chain. He estimated the total number of individuals in the population of each species and the average biomass of each individual.

Which of the following shows the correct relation of these species in a food chain?

AS → R → P → Q
BR → S → Q → P
CQ → P → R → S
DP → Q → R → S

View All Answers (7)

Ans 1:

Siddhartha from Bal Bharati Public school Rohini, Delhi

Class : Class 6

it should be A

Ans 2:

Samarth Tripathi from Ryan International School, Gurugram

Class : Class 6

c can also be possible. i dont understand why we pay to answer questions that are not even proofread.

Ans 3:

Sanvi domkondwar from Tch-orchids international school , Aurangabad

Class : Class 6

exactly

Ans 4:

Siddhartha from Gyanfort school, Farrukhabad

Class : Class 6

C option can be possible.

Ans 5:

Ishir Jha from Gyan Ganga Global Academy, Rosera

Class : Class 8

yes

Ans 6:

Siddhartha from Bal Bharati Public school Rohini, Delhi

Class : Class 6

Ans 7:

Akshaj Vardhan from DPS, Hyderabad

Class : Class 6

S --> R means R eats S. So, (A) is correct.

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Darshil Rath from Sai International School , Bhubaneswar

Subject :NSO Class : Class 3

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

Colunm-I (Bird)	Column-II (Nesting material)
a- Tailor bird	(i) Grass and twings
b- Weaver bird	(ii) Wood
c- Penguin	(iii) Leaves, cotton and dry grass
d- Woodpecker	(iv) Pebbles and stones

Aa-(iii), b-(i), c-(iv), d-(ii)
Ba-(i), b-(iii), c-(iv), d-(ii)
Ca-(iii), b-(i), c-(ii), d-(iv)
Da-(i), b-(iii), c-(ii), d-(iv)

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Ans 1:

Dyuti Ghosh from Mount Litera Zee School , JAJPUR ROAD

Class : Class 3

Ans 2:

T S from OWIS, Bangalore

Class : Class 4

Ans 3: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

A

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Srihari g from silveroaks, hyderabad

Subject :NSO Class : Class 10

Shaheen, a class 10 student studied the speed of the given reaction under different conditions.

In experiment I, she added 1 g of MnO₂ (catalyst) to 75 cm³ of 0.4 mol/L H₂O₂ solution at 30°C In experiment II, she added 1 g of MnO₂ to 100 cm³ of 'X' mol/L H₂O₂ solution at 'T' °(C) She recorded her observations and plotted a graph as shown in the given figure.
The values of X and T in experiment II could be respectively

A 0.30 and 35
B 0.40 and 30
C 0.25 and 30
D 0.30 and 30.

How to find this?

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