National Science Olympiad Forum By SOF Olympiad Trainer

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:

pranavramesh from sri chaitanya techno school, Chennai

Class : Class 6

d is the answer

Ans 2:

Inaara chauhan from First step school, Chhindwara

Class : Class 8

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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Nishant Hazarika from Air Force School, Dibrugarh

Subject :NSO Class : Class 3

Refer to the given diagram and select the correct option regarding X, Y and Z.

A X could be onion, Y could be turnip and Z could be mustard.
B X could be bean, Y could be balsam and Z could be rice.
C X could be balsam, Y could be onion whereas Z could be bean.
D X could be bean, Y could be mustard and Z could be grass.

Option A cannot be the answer as onion is edible but it is not in Edible group.

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Ans 1:

Bhavikaa kedia from Anand Niketan Satellite, Ahmedabad

Class : Class 5

A is the answer

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Rajveer Santosh Mulik from Rims International School, Pune

Subject :NSO Class : Class 4

Unscramble the given letters to get the name of an adaptation which is shown by the given animal.

ALUEBBRB
BAOFAUCMLEG
CILGSL
DETEFRHA

B IS CAMOUFLAGE SO ANSWER IS B.

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Ans 1:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi

Class : Class 7

B

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Pratham Dave from GNS, Bangalore

Subject :NSO Class : Class 5

Aashi grouped plants on the basis of their seed dispersal mode. By mistake, she put one wrong plant in each group. Identify the odd member out and select the correct option regarding this.
Group I : Maple, Lotus, Dandelion
Group II : Blackberry, Litchi, Coconut
Group III : Cocklebur, Geranium, Pea

A Lotus is incorrectly placed in group I and should be replaced with Euphorbia.
B Litchi in group II should be interchanged with Geranium in group III.
C Blackberry is incorrectly placed in group II and should be replaced with cotton.
D Cocklebur is incorrectly placed in group III and should be replaced with Lupin.

Lupin is dispersed by wind so how can it be D