National Science Olympiad Forum By SOF Olympiad Trainer

VANSH GARG from DPSG, GHAZIABAD

Subject :NSO Class : Class 4

If the given clock is 42 minutes fast, then the correct time after half an hour is __________.

A1 : 05
B11 : 23
C12 : 23
D1 : 23

cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

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Ans 1:

Trishan Saha from Salt Lake School , Kolkata

Class : Class 4

Option C.

Ans 2:

VANSH GARG from DPSG, GHAZIABAD

Class : Class 4

cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Ans 3:

Tavish Singh from Sanskriti School, Hyderabad

Class : Class 4

dddddddddddddddddddddddddddddddddddddddddddddddddddddddddd

Ans 4:

Shreyansh Saha from Dps Megacity, Kolkata

Class : Class 5

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Yash Bindal from Global Indian International School, Singapore

Subject :NSO Class : Class 9

Cells are of different shapes and sizes. Some cells are irregular in shape such as _________.

A Amoeba
B Red blood cell
C Leucocyte
D Both (A) and (C)

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Ans 1:

Dhairya Vinayak from Loyola High School, Patna

Class : Class 8

Ans 2:

AKHILESH from Chettin ad Vidyashram, Chennai

Class : Class 10

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Yash Bindal from Global Indian International School, Singapore

Subject :NSO Class : Class 9

Match column I with column II and choose the correct option from the codes given below.

Column I	Column II
P. Hot tea poured in saucer gets cooled faster.	(i) Evaporation increases with increase in temperature.
Q. We feel more cold after a hot water bath than a cold water bath.	(ii) Evaporation increases with decrease in humidity.
R. Water is cool in earthen pitcher during dry hot day.	(iii) Evaporation increases with increase in wind speed.
S. We feel comfortable under a moving fan in summer.	(iv) Evaporation increases with increase in surface area.

A P - (ii), Q - (i), R - (iii), S - (iv)
B P - (iii), Q - (iv), R - (ii), S - (i)
C P - (iv), Q - (i), R - (ii), S - (iii)
D P - (iv), Q - (ii), R - (iii), S - (i)

given answer is wrong.

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NANDAKISHOR from BHAVANS VIDYAMANDIR, COCHIN

Subject :NSO Class : Class 5

What holds matter together?

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Suvan Shee from Chirec public school, Hyderabad

Subject :NSO Class : Class 9

Study the given flow chart and choose the correct statements.
Sulphur + Coal powder + Common salt

(i) The property used to separate the mixture is solubility of different components in different solvents.
(ii) Sulphur is soluble in carbon disulphide, salt in water and coal is insoluble in both.
(iii) X is water and Y is carbon disulphide.

A (i) and (ii) only
B (ii) and (iii) only
C (i) and (iii) only
D All are correct.

its only 2 and 31 refers to chromatography

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Anunnakee Banerjee from BBPS NOIDA, NOIDA

Subject :NSO Class : Class 2

Which of the following correctly shows the path that air takes in our body as we breathe in?

A Nose → Gullet → Lungs
B Mouth → Gullet → Heart
C Nose → Windpipe → Lungs
D Lungs → Windpipe → Nose

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Anunnakee Banerjee from BBPS NOIDA, NOIDA

Subject :NSO Class : Class 2

Select the correct match of activity and the muscle it makes strong.

A Jogging - Arm muscles
B Rope skipping - Leg muscles
C Playing badminton - Stomach muscles
D Running - Neck muscles

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Manish Saruparia from NPS Singapore, Singapore

Subject :NSO Class : Class 2

If the clock shows 15 minutes past 9, then minute hand is at _____ .

(a) Q
(b) P
(c) S
(d) R

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rahul from euroschool, Mumbai

Subject :NSO Class : Class 3

A torch is shone on a wooden prism and a beach ball as shown below.

What will be the shape of shadow observed on the screen?

A
B
C
D

how is it correct

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Ans 1:

Avinita from NK Bagrodia Rohini , Delhi

Class : Class 3

c

Ans 2:

Havi Jain from GEMS modern academy, Gurgaon

Class : Class 8

A

Ans 3:

Trisha Awasthi from dpsnoida, Noida

Class : Class 3

Ans 4:

Ivan Tyagi from Chirec International School , Hyderabad

Class : Class 8

A

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Rikhil Taneja from IVY World School, Jalandhar

Subject :NSO Class : Class 9

Select the incorrect differences between collenchyma and sclerenchyma.

	Collenchyma	Sclerenchyma
(i)	It is made up of dead cells.	Its cells are living.
(ii)	Lumen or cell cavity is wide.	Lumen or cell cavity is usually narrow.
(iii)	It provides hardness to the region where it occurs.	It keeps the organ soft.
(iv)	Wall thickening is not uniform.	Wall thickening is uniform.
(v)	Pits are simple and straight.	Pits are simple, oblique and may be branched.

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

I think correct answer is b. But SOF is saying it is c.

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