National Science Olympiad Forum By SOF Olympiad Trainer

shlok dhoot from rnles, latur

Subject :NSO Class : Class 8

A substance in gaseous form is being cooled to solid state. Its temperature will remain constant when the substance is
(i) in condensing phase
(ii) in freezing phase
(iii) at thermal equilibrium with the environment.

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

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Swamev Gupta from Amity International school, Gurgaon

Subject :NSO Class : Class 8

Each beaker given below contains two metal strips of same size fastened together and immersed in the salt solution of one metal as shown.

What is the reactivity of the metals?

AQ < P < R < S
BQ > P > S > R
CP > Q > R > S
DS > R > P > Q

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shlok dhoot from rnles, latur

Subject :NSO Class : Class 8

The displacement-time graph of a body in motion is shown here. The corresponding velocity-time graph will be.

A
B
C
D

Answer is given as option A....is it correct?

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Ans 1:

Gauri from Presidium, Gurgaon

Class : Class 10

hey the answer is (a) or (c) ?? cause in the solution the option which is given is (a) but the pic doesnt matches sof team kindly check

Ans 2:

Sugeeth Jayaraj S A from Don Bosco School Of Excellence, Chennai

Class : Class 9

Yup. This is still true

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shashwat pandey from Doon International School Dalanwala, Dehradun

Subject :NSO Class : Class 7

One of the four identical light bulbs in a series circuit has blown off as shown in the figure.

Which of the following statements is correct about the bulbs?

AZ will not glow while W, X and Y will glow as before.
BZ will not glow while W, X and Y will glow brighter than before.
CZ will glow brighter than before while W, X and Y will glow as before.
DNone of the bulbs will glow.

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Ans 1:

A SAI DEVA HARSHINI from KENDRIYA VIDYALAYA, VIZIANAGARAM

Class : Class 7

B

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VVM from dps, Ghaziabad

Subject :NSO Class : Class 9

A spring is compressed between two toy carts of masses m₁ and m₂. When the toy carts are released then spring exerts equal and opposite average force on each for the same time t. Assume that there is no friction between the toy carts and the ground, the velocities of toy carts are

AIn opposite directions but in inverse ratio of their masses
BIn opposite directions but in direct ratio of their masses
CEqual and in opposite direction
DEqual and in same direction.

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Ajay from Kendriya Vidyalaya No.2 Calicut, Calicut

Subject :NSO Class : Class 9

If animals that live on land and the animals that live in water are represented by two big circles and animals that live in water and on land are represented by small circle, the combination of these three can be best represented as.

A
B
C
D

b

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Ans 1:

Pragyan Srivastava from Manipal Public School, Lucknow

Class : Class 10

Ans 2:

Pragyan Srivastava from Manipal Public School, Lucknow

Class : Class 10

The answer should not be B as there is an area common to animals that live on land and those which live on water but not those which live on both, making it logically wrong.

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Samvita Patil from NHVPS, Bangalore

Subject :NSO Class : Class 2

Read what Sarita wrote about an orange that she had observed and answer
• Its skin is orange in colour.
• It smells good.
• It is sweet.
• It is rather round.
• It is not heavy.
How many senses did Sarita use in her observation ?

AFive
BTwo
CThree
DFour

Incorrect. How can touch(skin) sense the weight of an object?

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NIHAL from ISS, Sohar

Subject :NSO Class : Class 5

Akshi is taller than Reena who is shorter than Kirti. Aanya is shorter than Akshi but taller than Kirti. Two other girls are taller than Akshi. Who is the shortest?

AKirti
BAanya
CReena
DCan't be determined