National Science Olympiad Forum By SOF Olympiad Trainer

Jyothsna Jayesh from Sishya School , Hosur

Subject :NSO Class : Class 6

Ms. Shobhna conducted a science activity in following steps :
I : She made crystals of pure copper sulphate from an impure sample.
II : She dissolved the crystals in pure water to make a blue solution.
III : She added a metallic piece into the copper sulphate solution and after some time colour of the solution changed to green.
Which of the following statements is correct regarding this activity?

AStep I involves a physical change while steps II and III involve chemical changes.
BSteps I and II involve physical changes while step III involves chemical change.
CAll the steps involve physical changes.
DAll the steps involve chemical changes.

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DIVYA PRAKASH from ST.MICHAEL'S HIGH SCHOOL, PATNA

Subject :NSO Class : Class 7

Read the following statements.
(i) _____ tissue is involved in transportation of food in plants.
(ii) Transpiration produces a____ pull in the plant that causes the water to move upwards.
(iii) ____ is the loss of water from leaves and other aerial parts of a plant.
(iv) ____ are known as soldiers of the body.
Select the option that correctly fills up the blanks in any two of the statements.

A (i)-Phloem; (iii)-Transpiration
B (ii)-Suction; (iv)-Platelets
C (i)-Xylem; (iv)-Leucocytes
D (iii) Transpiration; (iv) Plasma

the answer is a

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Ans 1:

S Sujan Chakravarthi from CLM Sishya OMR, Chennai

Class : Class 10

Its option A......you're correct......

Ans 2:

Yashraj Namdev Deshmukh from Sahyadri English School, Loha, Nanded

Class : Class 7

A

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Saanvi from Dehli Public School , Gurugram

Subject :NSO Class : Class 4

Arpit carried out an experiment to find out which kind of container is best for keeping the food hot. He put the same amount of food into 4 containers made of different materials which were of the same size and thickness and placed them in the same external condition. The result of his experiment was recorded on the graph as shown.
Based on results, which container, P, Q, R or S, is the best for keeping the food hot?

A Container P
B Container R
C Container S
D Container Q

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Ans 1:

Saanvi from Dehli Public School , Gurugram

Class : Class 4

Ans 2:

vedant from TSRS Aravalli, Gurgaon

Class : Class 5

c

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Ambati Daivik from Kendriya Vidyalaya, Dharwad

Subject :NSO Class : Class 7

The given graph shows comparative account of temperature range in four habitats (P, Q, R and S). Which of the following can be inferred from the given graph?
(i) Animals inhabiting P may show starling colouration and arboreal adaptations.
(ii) Animals inhabiting Q have thick lips and leathery skin.
(iii) Plants present in S may have thick fleshy photosynthetic stems and leaves modified into spines.
(iv) Animals inhabiting S possess thick layer of subcutaneous fat and have very small body appendages as compared to animals inhabiting Q and R.
(v) Plants like Spruce, Acacia and Opuntia are commonly found in habitat P.
(vi) Animals found in R may show hibernation or seasonal migration.

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

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Dhairya Vinayak from Loyola High School, Patna

Subject :NSO Class : Class 7

Which of the following processes occurs during inspiration?

ARelaxation of diaphragm muscles and increase in size of chest cavity.
BContraction of diaphragm muscles and increase in size of chest cavity.
CRelaxation of diaphragm muscles and decrease in size of chest cavity.
DContraction of diaphragm muscles and decrease in size of chest cavity.

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Ans 1:

kartick Somasundaram from san academy, chennai

Class : Class 1

inspiration means inhalation

Ans 2:

Joshua Sen from Montfort Senior Secondary School, Roorkee

Class : Class 9

inspirationwhat

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Sashwat Pattnaik from NPS BSK, Bangalore

Subject :NSO Class : Class 7

A car at 7:30 am is moving at a constant speed of 4 km min^–1 and an odometer reading recorded is 28568 km. What would be the odometer reading at 9:15 am?

A 28673 km
B 28988 km
C 29255 km
D 28568 km

Answer is B

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Daksh Singh from Sanskrit School Undri , PUNE

Subject :NSO Class : Class 3

Which of the following statements is INCORRECT?

A We should allow sunlight to enter our house because it helps to kill germs.
B We should put wire mesh on the windows to stop the entry of dust and light.
C We should welcome our guests in the living room of our house.
D We should use bricks, cement, etc., to make our permanent houses as they make a house strong.

the correct answer is B

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Ans 1:

Daksh Singh from Sanskrit School Undri , PUNE

Class : Class 3

the answer is B

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Devina kashyap from TPS, Mumbai

Subject :NSO Class : Class 5

Select the correct option regarding the given food web.

A The energy transferred from R to S is higher than energy transferred from Q to S.
B Q, T and W are the herbivores in this food web.
C There are 5 food chains in this food web.
D If S is removed from this community, then population of Q will increase but that of R will decrease.

D should be the correct answer

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Ans 1:

Sivashankar from ,

Class : Class 5

C I s correct

Ans 2:

Chandradeep Kumar from ,

Class : Class 5

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Dishita Santosh Walujkar from Nutan English School, Kurduwadi

Subject :NSO Class : Class 4

Manoj crossed out 'mushroom' from the given group because he felt that it did not belong to this group. Which of the following statements support Manoj’s conclusion?

A. Mushroom is a plant while the rest are not.
B. Mushroom is a fungus while the rest are not.
C. Mushroom feeds on decaying things while the rest do not.
D. Mushroom cannot make its own food while the rest can.

AB and C only
BA, B and D only
CA, C and D only
DB, C and D only