National Science Olympiad Forum By SOF Olympiad Trainer

Abhijay Saha from Delhi Public School, Megacity, Kolkata

Subject :NSO Class : Class 3

You are making a model of the Earth and the Moon to show their relative sizes. If you take volley ball as Earth, then _________ can be taken as the Moon.

A Soccer ball
B Table tennis ball
C Basket ball
D Football

View All Answers (3)

Ans 1:

Nishantkumar from KIIT INTERNATIONALSCHOOL, BHUBANESWAR

Class : Class 5

Football

Ans 2:

Nishantkumar from KIIT INTERNATIONALSCHOOL, BHUBANESWAR

Class : Class 5

Football

Ans 3:

Kashika Goel from DPS Noida, Noida

Class : Class 7

table tennis ball moon is always smaller than earth

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ANUSHKA SAHA from ST. JOSEPH'S CONVENT, CHANDANNAGAR

Subject :NSO Class : Class 7

In a pressure-kerosene stove,
(i) We pump kerosene and convert it into vapours.
(ii) The vapours are then ignited.
Which of the following is true about the above statements?

A (i) is a chemical change; (ii) is a physical change.
B (i) is a physical change; (ii) is a chemical change.
C Both (i) and (ii) are physical changes.
D Both (i) and (ii) are chemical changes.

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Ans 1:

Atul Sanjeev from Indian School Al Ghubra, Muscat

Class : Class 9

Ans 2:

Shaurya from Mris 51 Gurugram, Gurugram

Class : Class 7

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ANUSHKA SAHA from ST. JOSEPH'S CONVENT, CHANDANNAGAR

Subject :NSO Class : Class 7

Which of the following statements is correct about the given changes?
(i) Drawing copper into a wire
(ii) Breaking of a glass
(iii) Heating an iron nail till red hot
(iv) Inflating a basketball

A (i) and (ii) are chemical changes while (iii) and (iv) are physical changes.
B (ii) and (iii) are chemical changes while (i) and (iv) are physical changes.
C All are physical changes.
D All are chemical changes.

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Vivan from SCHOOL, CITY

Subject :NSO Class : Class 6

Two boys are standing in front of a plane mirror as shown in the figure. If boy II walks 7 m towards boy I, then how far would the image of boy II appear to boy I?

A7 m
B9 m
C11 m
D14 m

can you please explain it properly. In the question, u have shown that boy 2 walks 7 meters towards boy 1. So then he would have been 5 meters away from boy 1. 12-7=5 2=7. In the solution, u have shown. 12-5=7 2=9. If the answer is 9 as u have shown, how will the boy 2 if went 7 meters to the boy 1 be away from the mirror by 9 Meters

View All Answers (7)

Ans 1:

Sarang Shete from Amanora School, Pune

Class : Class 8

Ans 2:

Akshara from sishya OMR , chennai

Class : Class 8

Ans 3:

sudeep from DPS, Bangalore

Class : Class 8

boy 2- 2 12=14 -7=7m boy 2 in mirror for boy 1- 7m 2m= 9m

Ans 4:

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

Class : Class 9

Boy I (2m) (12-7) = 2 5 = 7 m SOF see this

Ans 5:

Akshara from sishya OMR , chennai

Class : Class 8

Ans 6:

Sarang Shete from Amanora School, Pune

Class : Class 8

I think that there is a mistake in this question. Please fix.

Ans 7:

Anika S Kumar from Alphabets International school , Chennai

Class : Class 7

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Rohan David from Oakridge International school, Hyderabad

Subject :NSO Class : Class 7

A speed-time (v-t) graph of an object is shown in the figure.

Which of the following best describes the graph?

AThe object drops through vacuum.
BThe object drops through air.
CThe object is being thrown downwards through vacuum.
DThe object is being thrown downwards through air.

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Ans 1:

Kshitij Samant from S M Shetty International School, Mumbai

Class : Class 8

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Agastya Tripathi from dps gurgaon, Gurgaon

Subject :NSO Class : Class 7

Which of the following statements are incorrect regarding the given animals?

(i) Both X and Y possess streamlined body and webbed feet.
(ii) Both are good swimmers.
(iii) Y has a thick layer of fat under its skin with fur on its body, while X has thick skin and a layer of fat under its skin.
(iv) Both live together in large numbers and huddle together to keep themselves warm.
(v) Y has very strong sense of smell unlike X.

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

View All Answers (7)

Ans 1:

Nandu from The Asian School, Bahrain

Class : Class 3

SO SOF Says ans is B which is true

Ans 2:

sankalp from Gyan Bharti School, Saket, Delhi

Class : Class 9

POLAR BEARS HAVE PARTIALLY WEBBED FEET. I WAS ALOS CONFUSED ABOU IT. THEY MAKE THEIR BODY STREAMLINED DURING SWIMMING

Ans 3:

sankalp from Gyan Bharti School, Saket, Delhi

Class : Class 9

Ans 4:

Vihaan Tyagi from Vikas the concept, Hyderabad

Class : Class 10

Polar Bear doesn't have webbed feet

Ans 5:

Anidhya from St.Mary's Convent School , Ghaziabad

Class : Class 7

Ans 6:

Aarna from Bethany High, Bangalore

Class : Class 7

Ans 7:

Nandu from The Asian School, Bahrain

Class : Class 3

No sry SOF says ans is D which is true

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Can I get Rank 35 darryl from Global Indian international school, Brawl stars

Subject :NSO Class : Class 7

Observe the given figure.

What will be the condition of the given structures when we breathe in air?

A
B
C
D

lol

View All Answers (5)

Ans 1:

Karthikeyan from VAILANKANNI PUBLIC SCHOOL, Krishnagiri

Class : Class 10

The given answer is wrong.The correct option is B only.

Ans 2:

Pranshu pratyush puhan from DPS siliguri, west bengal

Class : Class 10

The answer is c as diaphram contracts to flatten

Ans 3:

Avn lakshmi from Bvbarra, Hyderabad

Class : Class 4

Ans 4:

Archishman Pal from Sri Krishna Mission School, Agartala

Class : Class 9

I think the answer will be (B)

Ans 5:

Shreya Sudarshan from RVK - Banashankari, Bengaluru

Class : Class 7

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Arnav Raj Sharma from GEMS International School the ultra master mega, Gurgaon

Subject :NSO Class : Class 8

When the applied force is doubled on an object and the object is still at rest, then friction becomes

A Doubled
B Halved
C Quadrupled
D Zero.

View All Answers (1)

Ans 1:

Het Aryan from Podar International School , Pune

Class : Class 9

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Rohan David from Oakridge International school, Hyderabad

Subject :NSO Class : Class 7

Which of the following options satisfies the same conditions of placement of dots as in Fig.(X)?

A
B
C
D

Both C and D are correct, as the placement of dots is the same

View All Answers (4)

Ans 1:

Aravind from FIS, Bangalore

Class : Class 8

Can someone explain?

Ans 2:

Rahul Panda from St. Xavier's High School, Kendujhar

Class : Class 7

How option[D]is represented as correct answer?

Ans 3:

Pratham Dave from GNS, Bangalore

Class : Class 7

Shouldn't the answer be 'C'?

Ans 4:

Aravind from FIS, Bangalore

Class : Class 8

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Sof Team from Sof Olympiad Trainer Helpdesk, Bangalore

Subject :NSO Class : Class 6

The given question contains a set of three figures X, Y and Z showing a sequence of folding of a piece of paper. Figure (Z) shows the manner in which the folded paper has been cut out. Select a figure from the options which would most closely resemble the unfolded form of
figure (Z).

A
B
C
D

it is c and not a cause as never die they become a part of you as never die

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Ans 1:

Sof Team from Sof Olympiad Trainer Helpdesk, Bangalore

Class : Class 7

kiddin cause the diamond is close to the edge

Ans 2:

Sof Team from Sof Olympiad Trainer Helpdesk, Bangalore

Class : Class 7

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