National Science Olympiad Forum By SOF Olympiad Trainer

Saujas Ghosal from Bharatiya Bidya Bhavan, Kolkata

Subject :NSO Class : Class 8

In which of the following activities is work done

(A) A boy shaking a tree

(B) Ali pushing against the wall

(C) A man pushing a stalled car

(D) A worker pushing a loaded car.
In options C and D, it is not indicated whether the car has moved or not. How do I then understand as to whether work has been done or not?

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Ans 1:

from ,

Class :

Venus is the hottest planet even though Mercury is the closest planet to the Sun. The reason that Venus is hotter than Mercury is because it has an atmosphere made of carbon dioxide; it also has clouds of acid inside its atmosphere. This is called greenhouse effect.

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Kavyam Rustagi from Delhi Public School, Ethalbari , Binnaguri

Subject :NSO Class : Class 3

Which of the following correctly shows the water level when a beaker of water is tilted ?

(A) W-2.eps

(B) W-3.eps

(C) W-4.eps

(D) W-5.eps

answer c

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is C.

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payal verma from GD goenka, Lucknow

Subject :NSO Class : Class 5

Which one of these groups contains only animals with a backbone (vertebrates)?

(A) Earthworm, snake, crayfish

(B) Crayfish, snake, horse

(C) Roundworm, fish, earthworm

(D) Horse, snake, fish.

snakes don't have a backbone

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Ans 1:

Soham Ghosh from Mt. Carmel School, New Delhi

Class : Class 7

option D

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Anusha from LBS School , Kota

Subject :NSO Class : Class 3

The graph below shows the number of visitors to the Fish Farm in various months. Study the graph carefully and answer the questions.

There were _____ more visitors in February than in January.

(A) 20

(B) 30

(C) 60

(D) 90

Answer should be B. Kindly correct it.

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Ans 1:

Pankaj Rajput from RBK GLOBAL SCHOOL, THANE

Class : Class 4

answer is (B)

Ans 2:

Anusha from LBS School , Kota

Class : Class 10

Answer given is wrong. It should be B.

Ans 3:

Sreenath from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi

Class : Class 5

B

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Purushottam Rane from MSM English school, Malkapur Dist Buldana

Subject :NSO Class : Class 7

Insectivores plants are Autrotrophs or Hetrotrphis

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Ans 1:

Anurag bagal from DAV public school Airoli, Navi Mumbai

Class : Class 7

Its a heterotrophic as it depends upon insects and insects are directly or indirectly depend upon plants

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Aditya singh from AKSHARA INTERNATIONAL SCHOOL, pune

Subject :NSO Class : Class 6

When a little bit of curd is added to milk and it is left undisturbed for sometime, the milk changes into curd. It is an example of

(A) Fast chemical change

(B) Fast physical change

(C) Slow chemical change

(D) Slow physical change.
can you explain how is it a slow chemical change as its written after sometime

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Ans 1:

Mrudula Achar from Greenwood High, Bangalore

Class : Class 9

It is a slow chemical change because the change happens slowly and you can not turn curd back into milk

Ans 2:

ANWESH from DAV DEEPSIKHA, DEEPSIKHA

Class : Class 8

slow chemical change

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Vivan from Tathva International school, Tokyo

Subject :NSO Class : Class 7

Bob is trying to turn rod P into a magnet by the following stroking method. He finds that this method does not work. Which two of the following could be the possible explanations?

(1) He should stroke rod P with the south-pole instead.
(2) The bar magnet is not touching rod P.
(3) The bar magnet strokes rod P in more than one direction.
(4) Rod P is not a magnetic material.
(a) 1 and 2
(b) 2 and 3
(c) 2 and 4
(d) 3 and 4