National Science Olympiad Forum By SOF Olympiad Trainer

Ritvija from Sanawar an Institute for children, Bathinda

Subject :NSO Class : Class 4

During her summer vacations, Nishtha is going to a place where stilt houses and floods are very common. Which of the following should she preferably pack in her luggage?

A
B
C
D

Ans 1:

saketh from VIBGYOUR HIGH ,BTM layout Bangalore, Bangalore

Class : Class 4

c

Ans 2:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi

Class : Class 7

D

Ans 3:

Ritvija from Sanawar an Institute for children, Bathinda

Class : Class 10

Ans 4:

Ishaan Singh from BBPS, Gurugram

Class : Class 9

The correct answer is C.

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Bhagyesh Kamal from DPS, Mumbai

Subject :NSO Class : Class 8

Refer to the given figures, P and Q.

How do reproductive cells produced in P differ from those produced in Q in terms of production and their modes of storage?

A Mature cells of P can get stored for longer periods in reproductive tract whereas in Q, only immature cells remain stored.
B P produces fewer reproductive cells than Q does.
C Reproductive cells produced by P do not show motility.
D Q produces reproductive cells for a longer period in an individual’s life span than P does.

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NAMAN HARITASH from DPS DLF CITY, GURGAON

Subject :NSO Class : Class 8

Why is the switch for any electrical appliance in ac circuit always connected to the live wire?

A No current flows in the neutral wire.
B There will be a short circuit if the switch is in the Earth lead.
C The device can be switched off easily if the switch is in the neutral lead.
D The device can be isolated (mode safe) if the switch is in the live lead.

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Ans 1:

Siya Aneja from Tagore International , SOUTH DELHI

Class : Class 8

(D)

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NAMAN HARITASH from DPS DLF CITY, GURGAON

Subject :NSO Class : Class 8

Which of the following is correct?

A Water can be used for extinguishing fires caused due to electrical faults.
B Carbon is a non-metal so it cannot be used in electrolytic cell.
C A liquid conducts electricity because of the presence of ions.
D Pure water forms ions to conduct electricity.

answer shall be c

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Ans 1:

NAMAN HARITASH from DPS DLF CITY, GURGAON

Class : Class 9

c

Ans 2:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore

Class : Class 9

Ans 3:

Parth Dhondiram Gadgile from Narayana international school Loha Dist. Nanded, Parbhani

Class : Class 8

D is right ans guys

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Dushyant Singh from Shri Ram Centennial School, Indore

Subject :NSO Class : Class 5

A housewife was preparing hot meal for her family. She accidentally placed her fingertip into some boiling soup, but quickly withdrew it. She felt significant pain in the finger immediately after that. Which of the following is the most likely explanation for this time lag?

A The withdrawal of her finger is a reflex action that is triggered more quickly than the transmission of information related to pain stimulus to her brain.
B The pain receptors present on her finger skin are less efficient, so information regarding pain is transmitted to brain at a slower rate as compared to that of heat.
C The withdrawal of her finger is controlled by brain so it occurs very fast whereas feeling of pain is a reflex action controlled by spinal cord so it takes comparatively much more time.
D None of these

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Ans 1:

Sanskriti Nagar from Rose Bud Academy, khagaria

Class : Class 5

A is the correct answer

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Kriday from KDAV, Jamnagar

Subject :NSO Class : Class 4

Seema took four syringes with stoppers inserted at their nozzles. Each syringe contains a different substance. All syringes are completely filled with their contents such that their plungers are pulled out to the maximum. Which of the following plungers can be pushed in easily?

A
B
C
D

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Ans 1:

saketh from VIBGYOUR HIGH ,BTM layout Bangalore, Bangalore

Class : Class 4

b

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Mukti from OWIS, India

Subject :NSO Class : Class 7

Which of the following statement(s) is/are incorrect?
(i) Two thin woollen sweaters are warmer than a thick woollen sweater.
(ii) It saves fuel if we cook food in a vessel which is blackened at the bottom and polished from the sides.
(iii) The cable wires between two poles are left loose because in summers, the wires do not break on expanding.

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

How will leaving it loose relate to expansion in summers? Summer should be replaced with winters and expanding we replaced with contracting..

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Ans 1:

somesh from Centre point katol road, Nagpur

Class : Class 6

C

Ans 2:

Shourya Bhushan from DPS Gurgaon, Gurgaon

Class : Class 7

Ans 3:

Subhang Deep Sahu from Narayana CO Kadugodi Bangalore, Bangalore

Class : Class 8

Ans 4:

somesh from Centre point katol road, Nagpur

Class : Class 6

The answer is cSystumm

Ans 5:

Nityashree Neelakandan from null, null

Class : Class 9

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sonia from st. stephens school, kolkata

Subject :NSO Class : Class 3

I cant able to open my tests... what should I do? Pls reply ...

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Gunnit Kant from DPS, Nerul, Navi Mumbai

Subject :NSO Class : Class 4

Select the odd one out.

A
B
C
D

the correct answer is D

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Ans 1:

Gunnit Kant from DPS, Nerul, Navi Mumbai

Class : Class 5

D

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Snigdha swaminath from Christ nagar higher secondary school , Trivandrum

Subject :NSO Class : Class 6

Which of the following is the correct difference between weaving and knitting?

A Weaving is done with machine while knitting is done with hand only.
B Weaving uses two sets of yarn while knitting involves only one yarn.
C Weaving is done for silk only while knitting is done for wool only.
D All of these

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

Both weaving and knitting can be done by hand as well as by machines.Weaving is done for all types of fibres, not just silk. Knitting is mainly done for wool, but it is also done for cotton, silk, nylon, etc. and not just for wool.

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