National Science Olympiad Forum By SOF Olympiad Trainer

Rishaan Dixit from DPS Noida, Noida

Subject :NSO Class : Class 4

Which of the following statements is/are incorrect regarding the given figures X and Y?

1. X depends partly on animals for food but can also make its own food while Y cannot make its own food.
2. X has chlorophyll while Y does not contain chlorophyll and is non-green.
3. In X, food is prepared by the green stem, whereas Y obtains its food from dead and decaying plants and animals.
4. X and Y have patches of green colour. Only green part of their leaves performs photosynthesis.

A1, 3 and 4 only
B2 and 3 only
C1 and 4 only
D3 and 4 only

b

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Vihan S from NPSI, Singapore

Subject :NSO Class : Class 5

Read the given statements and select the correct option.
Statement 1 : Physical change does not affect the composition of matter.
Statement 2 : Chemical change results in the formation of new substance with different properties.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true and statement 2 is false.
D Both statements 1 and 2 are false.

How

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vamsika from Yuva Bharathi Public school, coimbatore south

Class : Class 5

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rahul from euroschool, Mumbai

Subject :NSO Class : Class 7

A scientist took a metal rod and a wooden rod and wrapped each of them in a piece of paper. These were then heated as shown. It was found that the paper around the metal rod does not burn whereas the one around the wooden rod catches fire. It is because

AMetal being a good conductor, conducts away the heat given to the paper
BWood being an insulator, takes away all the heat
CCandle in case of iron rod, is near to the paper
DNone of these.

the explanation is not given

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Raghav Srinivasan from new horizon, bangalore

Subject :NSO Class : Class 3

Which of the following is NOT a healthy eating habit?

AEating low fibre diet, as it will help the digestive system to work better
BChewing the food properly
CWashing hands before and after the meal
DAvoiding ddrinking water immediately after a meal

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Raghav Srinivasan from new horizon, bangalore

Class : Class 4

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Y from Rainbow , Jaipur

Subject :NSO Class : Class 9

The given numbers are to be coded with the following conditions:

AXNWRSLOX
BXNPRSLOX
CWNWRSLOX
DXNPRSLOT

Why a is not correct

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Subhang Deep Sahu from Chrysalis High Kadugodi . , Bangalore

Subject :NSO Class : Class 6

Refer to the given graph plotted for three different fabric pieces of equal size P, Q and R on the basis of their water absorbing capacity and select the correct statement.

AP is made up of fibres obtained from Gossypium plant whereas R is made up of fibres obtained from an insect.
BQ is made up of protein fibres obtained from an insect whereas R is made up of cellulose fibres obtained from flower of a plant.
CR is made up of fibres obtained from plant stem by the process of retting whereas P is made up of fibres obtained from plant seed by the process of ginning.
DP is biodegradable whereas Q and R are non-biodegradable.

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Satwik Dixit from Christ Academy, Bangalore

Class : Class 7

According to the given graph the water absorption capacity of Q is maximum, P is moderate and R is minimum. Fibres obtained from Gossypium plant have moderate water absorbing capacity whereas fibres obtained from the insect silkworm will have very less water absorbing capacity.

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Nilanjana from Kv, Mumbai

Subject :NSO Class : Class 9

Which of the following statements is/are true for the mass of the substance deposited at the cathode?
(i) It is inversely proportional to quantity of electricity passed through electrolyte.
(ii) It is directly proportional to quantity of electricity passed through electrolyte.
(iii) It is directly proportional to the time for which electricity is passed through the electrolyte.
(iv) It is inversely proportional to the time for which electricity is passed through the electrolyte.

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

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Harsh baburao walke from Holy spirit convent school , Pune

Subject :NSO Class : Class 3

I am a rock but I can float on water. You can find me in your bathroom. Who am I?

ACoal
BMarble
CPumice
DSlate

https://www.sofolympiadtrainer.com/user/common/dashboard

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Kalp Jain from St Paul Sr Sec school, Mala Road, kota

Subject :NSO Class : Class 4

Which phase of Moon is shown by 'X' in the given figure?

AWaning Gibbous Moon
BWaxing Gibbous Moon
CWaning Crescent Moon
DWaxing Crescent Moon

it is waxing gibbous as per prep-guide

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Ans 1:

Swara Penubothu from Chirec International , Hyderabad

Class : Class 4

the answer is Waxing Gibbous. It is incorrectly answered as Waning Gibbous. Please correct the solution key.

Ans 2:

Shrihan Koley from Radiant International School , Patna

Class : Class 5

Ans 3:

Aindri Biswas from South point school , Kolkata

Class : Class 4

The image is not correct,the moon mustRotate anticlockwise,but the image is showing clockwise movement.plz correct the solution

Ans 4:

Priyanka Dahiya from ,

Class : Class 5

it is waxing gibbous. please clarify and rectify in answer key

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Vivaan tiwari from Vasant valley , New Delhi

Subject :NSO Class : Class 7

For an object, distance versus time graph is along X and Y axes, as shown below.
The average speed of the object is ________.

A 0.053 m s^–1
B 0.083 m s^–1
C 5 m s^–1
D 1.253 m s^–1

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Ans 1:

Sarah Ahmad from st. mary's school, delhi

Class : Class 8

Ans 2:

sidequarter from lala kamlapat singhania education centre, jhalawar

Class : Class 7

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