National Science Olympiad Forum By SOF Olympiad Trainer

Khushi Chhajer from Khushi Chhajer , Bengaluru

Subject :NSO Class : Class 3

Sonali has a metal strip made of two kinds of metals, X and Y which are tightly joined together.

Metal X expands less than metal Y when they are both heated. Which of the following diagrams represents the side view of the metal strip when it is heated?

A
B
C
D

explain please

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Ans 1:

Avyukta Saraswat from St Francis School , Greater noida west

Class : Class 3

it is c or d but which one

Ans 2:

Khushi Chhajer from Khushi Chhajer , Bengaluru

Class : Class 3

please share the explanation

Ans 3:

Risha Maithani Chaurasia from Euro School Kharadi, Pune

Class : Class 3

is it B or D?

Ans 4:

Gauranshi Pant from DPS Gurgaon, Gurgaon

Class : Class 4

Ans 5:

Risha Maithani Chaurasia from Euro School Kharadi, Pune

Class : Class 3

Need explanation

Ans 6:

Jaanvika from The psbb Millennium school , Coimbatore coimabtore

Class : Class 3

a

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Diva SINHA from Ralli International School , Ghaziabad

Subject :NSO Class : Class 6

Read the following passage carefully. P helps to maintain strong eyesight and healthy skin. Q is required for normal growth of bones in children. R is essential for proper functioning of muscles and nerves. S is needed for natural clotting of blood.
Identify P, Q, R and S and select the incorrect statement regarding these.

AQ is produced when the skin is exposed to sunlight.
BR is a mineral, deficiency of which causes spasms, poor digestion, anxiety and sleeplessness.
CCod liver oil is a good source of both P and S.
DS is synthesised in our body by bacteria present in the gut.

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Ans 1:

Mishika from Delhi Public school, Chandigarh

Class : Class 6

vitamin E helps in clotting of blood. hence P and S are vitamin A and E respectively. in the solution it is written that S is vit. D . CAN ANYONE EXPLAIN HOWW???? The ans should be NONE

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Diva SINHA from Ralli International School , Ghaziabad

Subject :NSO Class : Class 6

The process of forging and casting metals is a ________ change.

AChemical
BPermanent
CPeriodic
DPhysical

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Ans 1:

Satwik Dixit from Christ Academy, Bangalore

Class : Class 7

The answer is D

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Diva SINHA from Ralli International School , Ghaziabad

Subject :NSO Class : Class 6

Study the given classification chart carefully and identify the incorrect statements regarding the properties U, V, W, X, Y and Z.

I. U refers to 'more dense than water' while Z refers to 'non-edible'.
II. W refers to 'malleability' while V refers to 'hardness'.
III. Y refers to 'more dense than water' while X refers to 'ductility'.
IV. W refers to 'magnetic material' while X refers to 'non-magnetic material'.

AII and III only
BI and III only
CI, III and IV only
DI, II, III and IV

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Ans 1:

SANVIKA TRIPATHY from JBCN International Chembur, Mumbai

Class : Class 6

iT CORRECT ONLY

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Diva SINHA from Ralli International School , Ghaziabad

Subject :NSO Class : Class 6

A mixture of two immiscible liquids can be separated by (i) , a mixture of two volatile liquids with a minimum difference of 25°C in boiling points can be separated by (ii) , a soluble solid from water can be separated by (iii) while a mixture of two solids having different sizes can be separated by (iv) .
(i), (ii), (iii) and (iv) could be respectively

ASeparating funnel, boiling, filtration and sieving
BDecantation, evaporation, sieving and winnowing
CSeparating funnel, distillation, evaporation and sieving
DNone of these.

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Diva SINHA from Ralli International School , Ghaziabad

Subject :NSO Class : Class 6

An object O is placed in front of a plane mirror UV as shown in the diagram. A student moves her eyes along the line XY to observe the image of O. Identify the point(s) on the line XY where the image of O can be seen.

Aa, b and c only
Ba, c and d only
Cb and c only
Dd only

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Ans 1:

Ram Prasath from ISG, Muscat

Class : Class 6

ko

Ans 2:

Shreyasi Padihary from The Cambridge International School , Bangalore

Class : Class 7

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Jaden Gadar from Ryan International School, Surat

Subject :NSO Class : Class 3

Select the option which on unscrambling gives the name of a dark coloured nutrient rich component of soil.

A VRAEGL
B MUUSH
C ANSD
D YLAC

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SAJITA AMUTHAN from Mayoor Private School , AbuDhabi

Subject :NSO Class : Class 4

Letters H to M in the given food web represent six animals.

Which of the following is correct regarding this?

A A decrease in population of H will result in an increase in populations of l and L.
B An increase in population of K will result in an increase in populations of l and J.
C A decrease in population of M will result in an increase in populations l and K.
D An increase in population of L will result in a decrease in populations of H and J.

The question is not specific about the direction of arrow and what it represents-whether consumption or 'the consumed'?It can be inferred that in option D, M is being consumed by I and K. In this case an increase in L will decrease H which will increase I's population thereby reducing J.In that case option D would be correct.

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Akshita Goel from dpsnoida, Noida

Subject :NSO Class : Class 7

Anita conducted an experiment to calculate the percolation rate of water in different types of soil samples. She took 200 ml water and poured it into three different types of soil samples. She noted the time that was taken by water to percolate through soil. Which of the following graphs correctly shows the relationship between amount of water percolated through different soil samples with respect to time?

A
B
C
D

nice question

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Ans 1:

Akshita Goel from dpsnoida, Noida

Class : Class 7

Ans 2:

SIDHI CHOPRA from DPS PANIPAT REFINERY, PANIPAT

Class : Class 7

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Aarav parmar from Rockwoods High school, Udaipur

Subject :NSO Class : Class 5

Which of the following can be obtained by using the letters given in the box? (You can use each letter more than once.)

A A natural disaster that can be measured on Richter scale.
B An enormous water wave that is caused by an earthquake in the ocean floor and creates havoc in coastal areas.
C A strong tropical storm with fast spinning winds.
D Both B and C

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