National Science Olympiad Forum By SOF Olympiad Trainer

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

Ans 2:

Prahallad Rath from pawar public , pune

Class : Class 8

Ans 3:

Arav Gupta from Delhi Public School Gurgaon, Gurgaon

Class : Class 8

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

Ans 4:

Pranshu pratyush puhan from DPS siliguri, west bengal

Class : Class 10

What is the question asking?Where are the answers?

Ans 5:

Nishan Asif from INDIAN SCHOOL SOHAR OMAN, SUHAR

Class : Class 9

???? wrong options

Ans 6:

Vihaan Nair from Ambassador School, DUBAI

Class : Class 8

Useless solution!

Ans 7:

arnav raj sharma from gulibulium school, new york

Class : Class 8

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

Ans 8:

midhuna from ABCD, Hyderabad

Class : Class 8

please correct the errorsince we are paying money!

Ans 9:

Archishman Pal from Sri Krishna Mission School, Agartala

Class : Class 9

What the question interrogates ????

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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kpks14 from RIMT World School, Chandigarh

Subject :NSO Class : Class 6

Find the area of the shaded region in the adjoining figure.

(A) 324 cm²

(B) 200 cm²

(C) 180 cm²

(D) 88 cm²
barea of the total figure=6x2x12x2=12x24=288unshades triangles=11x0.5x4x4=88area of shaded part=288-88 = 200 sq cm

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Ans 1:

m abi kareem from Dr KRBM School AES Pushpavihar, New Delhi

Class : Class 6

answer is d 88 cm2

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Mani Gupta from Carmel Convent School, Faridabad

Subject :NSO Class : Class 8

In a large commercial complex there are four ways to reach the main road. One of the paths has loose soil, the second is laid with a polished granite, the third is laid with bricks and the fourth has cemented gravel surface. It is raining heavily and Suman wants to reach the main road. The path on which she is least likely to slip is

A Loose soil
B Bricks
C Polished granite
D Cemented gravel.