National Science Olympiad Forum By SOF Olympiad Trainer

Aham from vibgyor high, Bangalore

Subject :NSO Class : Class 8

Which of the containers shown below will continue to have healthy fish and plants at the end of a week?

A
B
C
D None of these

Well actually, the *container* is too small for 3 fish. Those look like saltwater fishes, how do i know that water is mixed with salt. Saltwater fishes usually require tanks that are 10 gallon upwards for each fish, that one looks like 5 gallons. And to add, the fake plant, could hurt the fish if they graze against it, its not real because there is no substrate.

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S Malhotra from SFS , New Delhi

Subject :NSO Class : Class 2

grows on a ______.

ATree
BHerb
CShrub
DCreeper

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Aham from vibgyor high, Bangalore

Subject :NSO Class : Class 8

Which of the following scales is/are not linear in nature?
(i) Decibel (ii) Richter (iii) Meter

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

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shaurya aggarwal from scholars rosary senior secondary school, rohtak

Subject :NSO Class : Class 8

If each vowel in the word MOUNTAIN is replaced by the next letter in the English alphabet and each consonant is replaced by the previous letter in the English alphabet, then which of the following will be the fourth letter to the left of seventh letter from the left end?

AT
BV
CN
DP

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shaurya aggarwal from scholars rosary senior secondary school, rohtak

Subject :NSO Class : Class 8

Two rows of numbers are given. The resultant number in each row is to be worked out separately based on the following rules. The operations on numbers progress from left to right.
Rules :
(i) If a two-digit odd number is followed by a prime number, the first number is to be multiplied by the prime number.
(ii) If an even number is followed by another even number, the first number is to be divided by the second number.
(iii) If an odd number is followed by a composite odd number, the first number is to be added to the second number.
(iv) If an even number which is a multiple of 5 is followed by another number which is again a multiple of 5, the second number is to be subtracted from the first number.
(v) If a number which is a perfect square is followed by another number which is also a perfect square, then the square roots of the two numbers is to be multiplied.
64 25 25
88 8 n
If n is the resultant of the first row, what is the resultant of the second row?

A24
B36
C28
D26

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Ans 1:

Tanish from New horizon, Bangalore

Class : Class 8

please solve this

Ans 2:

Arnav Diwan from F.A.I.P.S Kuwait, Kuwait

Class : Class 10

See just requires some thinking:Here in first Row 64 25 25 here 25 is following 64 and both are perfect squares so we apply rule v) and using that we will multiply the square roots of both 64 and 25 so 8 X 5 which is 40 now in first row we have got 40 25 now here 40 is an even number and a multiple of 5 even 25 is multiple of 5 so we can use rule iv) we subtract 25 from 40 and get 15 now this 15 is the n in second row so we get 88 8 15 now both 88 and 8 are even numbers so using rule ii) we do 88/8 which is 11 now we get in second row 11 15 now here 11 is odd number and 15 is composite number so using rule iii) we add 11 and 15 so we get 26 and hence that is answer.

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Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon

Subject :NSO Class : Class 5

What is the Hindi name of the coldest planet of our solar system?

AMangal
BShani
CVarun
DArun

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Ans 1:

Ananya A from Chrysalis High Horamavu, Bengaluru

Class : Class 6

Ans 2:

Soham Hatua from The Hindu Senior Secondary School, Chennai

Class : Class 6

Ans 3:

Bidyaghnya Banerjee from Vidyasagar Shishu Niketan, West Bengal

Class : Class 6

Of course. . . it's Arun Grah.

Ans 4:

Archishman Ojha from Delhi Public School, NOIDA

Class : Class 7

D

Ans 5:

Ananya Ojha from Delhi Public School, Noida

Class : Class 5

D

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saikrishna from bharatiya vidhya bhavans public school, Hyderabad

Subject :NSO Class : Class 7

When high speed wind blows, an umbrella held upright sometimes get upturned. The reason being

A High speed wind creates a high pressure zone above and below the umbrella
B High speed wind creates a low pressure zone above and high pressure zone below the umbrella
C High speed wind creates a low pressure zone below and high pressure zone above the umbrella
D None of these

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Ans 1:

Harshitha Prakash from Kola Perumal Chetty Vaishnav Sr. Sec. School, Chennai

Class : Class 9

The answer is option B. Since the high speed winds create low pressure are, the umbrella would tend to move from high to low pressure area

Ans 2:

Saanjana from Vibgyor , Mumbai

Class : Class 8

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Aviral Yadu from Krishna Public School Dunda Raipur, Raipur

Subject :NSO Class : Class 7

Study the two groups of objects carefully. The objects are grouped according to _________.

AThe type of materials they are made of
BTheir uses
CTheir ability to float or sink in water
DTheir mass

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Ans 1:

ALICE from Delhi Public School, UDAIPUR

Class : Class 9

Ans 2:

lavnish kumar from o.p jindal school, ramghar

Class : Class 7

Their ability to float or sink in water

Ans 3:

lavnish kumar from o.p jindal school, ramghar

Class : Class 7

their ability to float or sink in water

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Krithik Mishra from Delhi Public School East, Bangalore

Subject :NSO Class : Class 3

Select the activity which will produce a different effect than the other three. A Fitting wheels on the bottom of a box to be dragged. B Putting oil on the hinges of a garage gate. C Tiling a cemented floor. D Replacing the laminated plastic board with cardboard for toy car racing.