National Science Olympiad Forum By SOF Olympiad Trainer

Shubh chawda from D g khetan , Mumbai

Subject :NSO Class : Class 7

You are busy eating your food when a spoonful of curry falls on your white shirt. You decide to go home and wash it. The moment you dip the shirt in soap water the stain _________.

ADisappears
BTurns green
CTurns red
DDoes not show any change

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Ans 1:

bswarajya from Mount Litera Zee School, Bengaluru

Class : Class 5

C

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Kingshuk Gupta from RN Podar school, Mumbai

Subject :NSO Class : Class 8

Fill in the blanks in the given paragraph by choosing the correct option.
Over million of years, absence of air, __p___ temperature and __q___ pressure transformed the dead organisms into ___r___ and s. One of the various constituents of s, __x___ is used in paints and road surfacing.

A
B
C
D

Too simple

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YASH SAH from DELHI PUBLIC SCHOOL MIS DOHA, Doha

Subject :NSO Class : Class 6

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

A Organism P could be a mammal which undergoes hibernation and is a good swimmer.
B Organism Q inhabits the area where baseball plant and golden barrel plant are of common occurrence.
C Organism R inhabits the area which gets plenty of rainfall throughout the year.
D Organisms P, Q and R show mimicry as a protective adaptation to escape their predators.

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Ayush from Dps, Bengaluru

Subject :NSO Class : Class 4

Shruti tool two similar bowls containing equal amount of water and sand. She placed both bowls in the sun for 2-3 hours. After 2-3 hours she placed both bowls inside the room for 2-3 hours.
Which of the following results she will observe from the given activity?

A Sand heats up faster than the water when kept in the sun and cools up slower than the water when placed inside the room.
B Water heats up faster than the sand when kept in the sun.
C Sand heats up faster than the water when kept in the sun and also cools faster than the water when placed inside the room.
D Water cools down faster than the sand when kept inside the room.

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Ans 1:

Aadya Kawale from Podar International ICSE , Dombivli East

Class : Class 4

Ans 2:

AadhiraKarthikumar from Shaanthischoolpollachi, Coimbatore

Class : Class 5

Ans 3:

Mishka Kankaria from SVKM J V Parekh International School, Mumbai

Class : Class 4

took not tool

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ARGHYA KUMAR from QACS, BHARUCH

Subject :NSO Class : Class 7

To investigate the conditions for rusting, following experiment was performed.

In which test tube, nails rusted most heavily and what inference can be drawn from it?

(A) Test tube P, water is needed for rusting.

(B) Test tube Q, air is needed for rusting.

(C) Test tube R, boiled water increases the rusting speed.

(D) Test tube S, presence of sodium chloride increases the rusting speed.

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SOHAN KARMAKAR from NAVA NALANDA HIGH SCHOOL, Kolkata

Subject :NSO Class : Class 9

Which of the following statements is/are correct?
I. 5 moles of CO₂ and 5 moles of H₂O have the same mass.
II. 100 g of NH₃ has more atoms than that present in 100 g of N₂_.
III. 16 g of solid sulphur contains 3.76 × 10²² molecules.

A I and II only
B II and III only
C III only
D I only

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Mani Gupta from Carmel Convent School, Faridabad

Subject :NSO Class : Class 8

A force of 12 N acts on a block P and block Q of masses 2 kg and 4 kg respectively as shown. Given that the floor is smooth, find the force on the string between blocks P and Q.

A 2 N
B 4 N
C 8 N
D 12 N

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ROUNAK from SARASWATI DEVI PUBLIC SCHOOL, KANDI

Subject :NSO Class : Class 9

A boy runs for 10 minutes at a uniform speed of 9 km h^-1. At what speed should he run for the next 20 minutes so that the average speed comes to 12 km h^-1?

A 13.5 km h^-1
B 10.2 km h^-1
C 8.2 km h^-1
D 7.72 km h^-1

Give me Solution

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Ans 1:

Sujata Samal from Alchemy school, Surat

Class : Class 8

somebody answer this

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ARNAB MANDAL from NAVY CHILDREN SCHOOL, VIZAG

Subject :NSO Class : Class 8

Which of the following does not represent characteristic of a good fuel?

A It should have a high calorific value.
B Its ignition temperature should be low but well above the room temperature.
C It should have a high rate of combustion.
D It should be fairly cheap and safe to handle and transport.

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Ans 1:

Nishan Asif from INDIAN SCHOOL SOHAR OMAN, SUHAR

Class : Class 9

???? wrong options

Ans 2:

Prahallad Rath from pawar public , pune

Class : Class 8

Ans 3:

Vihaan Nair from Ambassador School, DUBAI

Class : Class 8

Useless solution!

Ans 4:

Pranshu pratyush puhan from DPS siliguri, west bengal

Class : Class 10

What is the question asking?Where are the answers?

Ans 5:

arnav raj sharma from gulibulium school, new york

Class : Class 8

what is the relation between the options, question, and the solution

Ans 6:

Arav Gupta from Delhi Public School Gurgaon, Gurgaon

Class : Class 8

I don't think that's what we payed for...

Ans 7:

Nishan Asif from INDIAN SCHOOL SOHAR OMAN, SUHAR

Class : Class 9

Ans 8:

Archishman Pal from Sri Krishna Mission School, Agartala

Class : Class 9

What the question interrogates ????

Ans 9:

midhuna from ABCD, Hyderabad

Class : Class 8

please correct the errorsince we are paying money!

Ans 10:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore

Class : Class 8

The options to this question aren't related to what is being asked. There must have been an error from your side. Kindly correct it, SOF.

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Ajoy Bhuyan from DELHI PUBLIC SCHOOL, Bongaigaon

Subject :NSO Class : Class 4

Given statements show different steps involved in digestion of food. Select the option showing correct sequence of different steps.
a. The digestive juices break down the food into simpler substances.
b. Remaining water is absorbed.
c. Food is chewed and mixed with saliva.
d. Most nutrients are absorbed into the blood.

A c → b → a → d
B c → a → d → b
C a → c → d → b
D a → b → c → d

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Ans 1:

Gunnit Kant from DPS, Nerul, Navi Mumbai

Class : Class 5

the correct answer is B

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