National Science Olympiad Forum By SOF Olympiad Trainer

Jayendra Singh Jasrotia from Jodhamal Public School, Jammu, Jammu

Subject :NSO Class : Class 3

Match the column I with column II and select the correct option.

Aa-2, b-3, c-1
Ba-1, b-2, c-3
Ca-1, b-3, c-2
Da-3, b-1, c-2

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ROHIT KUMAR from DPS , SURAT

Subject :NSO Class : Class 5

Read the given statements.
1. I am present in air.
2. I enter your lungs when you breathe in.
3. I help in burning fire.
These statements are regarding _______.

A Carbon dioxide
B Hydrogen
C Nitrogen
D Oxygen

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Ans 1:

pranavramesh from sri chaitanya techno school, Chennai

Class : Class 6

the answer is oxygen

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Chatresh ramasai gudi from Bgsnps , Bangalore

Subject :NSO Class : Class 8

Richa conducted an experiment as shown in the figure to investigate how the height of the ramp affects the amount of force needed to move a wooden block up the ramp.

Which of the following variables must be kept the same to ensure that her experiment is fair?
I. Number of bricks
II. Material of the ramp
III. Size of the wooden block
IV. Mass of the wooden block

AI, II and III only
BI, III and IV only
CII, III and IV only
DI, II, III and IV

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Chatresh ramasai gudi from Bgsnps , Bangalore

Subject :NSO Class : Class 8

Match column I and column II and select the correct option from the given codes.

	Column I		Column II
P.	Electroscope	(i)	Conductor
Q.	Copper	(ii)	Lightning rods
R.	Spikes	(iii)	Ozone
S.	Lightning	(iv)	Charge

AP-(iv), Q-(i), R-(ii), S-(iii)
BP-(ii), Q-(iii), R-(iv), S-(i)
CP-(iii), Q-(iv), R-(i), S-(ii)
DP-(iii), Q-(i), R-(ii), S-(iv)

Answer is C.

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Sohan Choudhury from Delhi Public School Electronic City Bengaluru, Bengaluru

Subject :NSO Class : Class 6

The given table shows some characteristics of herbs, shrubs and trees.
Which of the given points is/are incorrect?

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

grass is a weed!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Ans 1:

Sohan Choudhury from Delhi Public School Electronic City Bengaluru, Bengaluru

Class : Class 6

grass is a weed!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 2:

LAVANYA DADHWAL from BLOOM PUBLIC SCHOOL, South West Delhi

Class : Class 8

Weeds can be a shrub,trees or herbs

Ans 3:

Juhan from Ism, Tiruvalla

Class : Class 7

Yes grass is a weed

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mukesh jain from mahesh English school, solapur

Subject :NSO Class : Class 4

Select the INCORRECT match.

AMangrove - Breathing roots
BCactus - Photosynthetic stems
CVenus flytrap - Roots trap insects
DTape grass - Ribbon like narrow leaves

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Ans 1:

Annlisa Castlia from BPS, HYD

Class : Class 5

The correct answer is option C.

Ans 2:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi

Class : Class 7

C

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Mrittika Roy from DPS Ruby Park, Kolkata

Subject :NSO Class : Class 7

A point source of light S, placed at a distance L in front of the centre of a plane mirror of width d, hangs vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown in the figure. The greatest distance over which he can see the image of the light source in the mirror is

A d/2
B d
C 2d
D 3d

The wording of the question isn't right!

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Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

I don't find any mistake here.. Maybe there is some.. Btw the answer is option d

Ans 2:

Sharadha T from The Grove School, Chennai

Class : Class 8

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Mithul Pranav KB from Narayana Olympiad School Madipakkam, Chennai

Subject :NSO Class : Class 5

Which of these safety rules should be done to prevent fire?

A Switch on the lights when gas is leaking.
B Burn crackers inside the house and under the supervision of an adult.
C Wear synthetic clothes in the kitchen while cooking.
D None of these.

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Ans 1:

Inaara chauhan from First step school, Chhindwara

Class : Class 8

d is the answer

Ans 2:

pranavramesh from sri chaitanya techno school, Chennai

Class : Class 6

d is the answer

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Shriya Prakash from NPS International, Singapore

Subject :NSO Class : Class 6

Ria was observing her mother cooking dinner in the kitchen. She tried to identify materials being used and their nature.

The given table represents her observations.

Which of her conclusions are incorrect?

AI, III and IV only
BII and IV only
CI only
DNone of these

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Ans 1:

Sahasra Shanker from KV IIT, Chennai

Class : Class 6

Both I and IV are incorrect. So, the answer is none of the above.

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Deepika from Vibgyor high, Mumbai

Subject :NSO Class : Class 4

Starting from first letter, strike out every alternate letter in the given letter groups to get the name of the traditional clothing of Japanese women.

A THPAQNRBSOTKG
B LKWIOMXOPNZOE
C MSPAGRLEDET
D NJBADCFKGEHTI

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