National Science Olympiad Forum By SOF Olympiad Trainer

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

The given photomicrograph shows the transverse section of two blood vessels, X and Y connecting the heart and the lungs.

Identify the blood vessels and select the incorrect statement regarding them.

A Blood vessel X connects right ventricle of heart with lungs.
B Blood vessel Y connects lungs with left atrium of heart.
C Blood in X contains higher percentage of oxygen as compared to blood in Y.
D X is pulmonary artery that carries deoxygenated blood from heart to lungs whereas Y is pulmonary vein that carries oxygenated blood from lungs to heart.

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

The given graph shows net uptake and net release of oxygen by a plant kept in open over a 24 hour period.
Which of the following holds true regarding the given graph?

A At 0800 hour, the oxygen taken up by plant in respiration is equal to oxygen released by it during photosynthesis.
B Plant is respiring throughout the 24 hour period but it is photosynthesising only between 0600 hours to 1800 hours.
C Assuming that the plant has the same respiration rate throughout 24 hour period, 70 mg of oxygen is produced by plant at 1600 hour.
D The highest rate of photosynthesis occurs at 1200 hour.

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Class : Class 10

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Rahul took a turmeric paper and tried to draw flowers on it with the help of cotton buds dipped in solutions P and Q. The flower drawn with solution P was not visible while the one drawn with solution Q. turned red.
Solutions P and Q. could be respectively

A Lime water and lemon juice
B Vinegar and soap solution
C Common salt solution and baking soda
D Both B and C.

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Which of the following statements are incorrect?
I. Decomposition reactions are generally carried out by heating or by passing electricity.
II. An oxidising agent removes hydrogen from other substance.
III. In precipitation reactions, two substances react in solid state to form a soluble product.
IV. Precipitation and neutralisation reactions are examples of single displacement reaction.

A I and III only
B III and IV only
C II and IV only
D All of these.

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Ans 1:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM

Class : Class 10

B

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

The details of a 12 hour journey of a car is given here.

Given that average speed of the car is 60 km h^–1.
What is the value of x?

A 120 km
B 180 km
C 240 km
D 720 km

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

The lengths of the mercury thread in a thermometer immersed in pure melting ice and in pure boiling water are 6 cm and 22 cm respectively. What is the temperature of a solution if the length of mercury thread is 14 cm in the solution?

A 50 K
B 273 K
C 323 K
D 373 K

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Ans 1:

Aansh sood from Mother teacher school, Barnala

Class : Class 8

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shrawan azad from DPS VASANTKUNJ NEW DELHI, New Delhi

Subject :NSO Class : Class 6

Refer to the given table.

Select the option that correctly identifies P, Q and R.

	P	Q	R
A	Beriberi	Vitamin C	Night blindness
B	Anaemia	Vitamin D	Scurvy
C	Pellagra	Vitamin D	Night blindness
D	Beri beri	Vitamin D	Night blindness

Answer is wrong

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Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

C is correct answer

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shreyash rawat from podar international school, pune

Subject :NSO Class : Class 4

Refer to the given conversation about simple machines. Identify the INCORRECT option regarding P, Q and R.

A Q can be used to hold things.
B P can be axe or knife.
C R can be a ramp in hospitals.
D Q helps to move heavy objects.

its D

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Ans 1:

Shasthika M D from Kautilya vidyalaya , Mysore

Class : Class 4

D is the answer

Ans 2:

Deveshi Sachdev from venkateshwar international school, New Delhi

Class : Class 6

it is D

Ans 3:

Ashwak from Cambridge, Jalandhar

Class : Class 9

D

Ans 4:

Parthiv Das from Legacy , Bengaluru

Class : Class 5

C is the answer

Ans 5:

shreyash rawat from podar international school, pune

Class : Class 8

its D

Ans 6:

Ridhan from SFS janakpuri, New Delhi

Class : Class 5

its a********************

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AMAN SAIKIA from DELHI PUBLIC SCHOOL DULIIAJAN, DULIAJAN

Subject :NSO Class : Class 7

Ruminant stomach is divided into four compartments. Select the correctly matched option.

AOmasum - Food is broken down into smaller pieces and water is absorbed.
BRumen - Fourth chamber and is the true stomach.
CAbomasum - Largest chamber and receives half chewed food from mouth.
DReticulum - Receives half digested food and sends it back to mouth as cud.

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Ans 1:

PRIYANSHU DEB from New Green Field School, Saket, New Delhi

Class : Class 7

according to top result in google also, when searched for "which organ sends cud to mouth in ruminants" says that rumen gets partially digested food and cud is formed. so option A is correct since water is absorbed in omasum

Ans 2:

Vedang Shridhar Sasturkar from Vasant Valley School, New Delhi

Class : Class 7

I agree with Priyanshu because i tried 4 different sources and they all said rumen

Ans 3:

AMAN SAIKIA from DELHI PUBLIC SCHOOL DULIIAJAN, DULIAJAN

Class : Class 9

Ans 4:

kartick Somasundaram from cps, chennai

Class : Class 3

Ans 5:

Agastya Tripathi from dps gurgaon, Gurgaon

Class : Class 4

Ans 6:

Sara Kashyap from Vista International, HYDERABAD

Class : Class 7

even i agree with priyanshu and vedang as this is written in the prep guide too...

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avsonawane from Blue Ridge Public School, Pune

Subject :NSO Class : Class 4

Read the following sentences with blanks in them. Select the option which correctly fills up the blanks in any two sentences.
(1) _________ provide door to door service.
(2) _________ carries country's largest amount of bulky goods like coal, cement, food grains, fertilizers, petroleum, automobiles, etc. from mines to industries and from industries to the areas of consumption.
(3) _________ is a better mode of transportation in reference to cross-continental transfers.
(4) _________ is very useful at the time of natural or any other calamities for saving people or supplying goods.
(5) Indian _________ service has the largest network in the world.

A 3 - Railways, 5 - Postal
B 3 - Water transport, 4 - Air transport
C 2 - Inland waterways, 5 - Telephonic
D 2 - Air transport, 1 - Roads

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Ans 1:

AHANA BAG from DELHI PUBLIC SCHOOL JOKA SOUTH KOLKATA, KOLKATA

Class : Class 9

Ans 2:

Keanna from APG, MUMBAI

Class : Class 7

Ans 3:

Devang Vrishni Kshirsagar from ,

Class : Class 4

Wait what about a cyclone or any other air calamite ?

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