National Science Olympiad Forum By SOF Olympiad Trainer

R Sanjay from Narayana Group School Puzhal, CHENNAI

Subject :NSO Class : Class 7

Books required

Ans 1:

Manvi Mundepi from Montfort School Roorkee, Roorkee

Class : Class 9

stupid

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TANIPARTHI CHAKRADHAR REDDY from AKSHARA INTERNATIONAL SCHOOL, HYDERABAD

Subject :NSO Class : Class 7

Read the given statements and select the correct option.
Statement 1: Many cut fruits, when kept in open turn brown.
Statement 2: Browning of fruits is due to a chemical reaction.

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.

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Ans 1:

Ivjot Singh Hanspal from Allen Career Institute, Surat

Class : Class 9

Option C is correct

Ans 2:

Preethi from KKIS, Singapore

Class : Class 7

lamo idk what is this but plz explain which one is correct

Ans 3:

VAMSIKRISHNA KADALI from BVM GLOBAL , CHENNAI

Class : Class 7

option a is the correct answer

Ans 4:

Ahaan Pathak from Treamis World School, Bangalore

Class : Class 8

Answer is A

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Rushika gupta from apeejay school, Faridabad

Subject :NSO Class : Class 5

A ship is made of iron but still it floats in water. This is because of its shape. A ship is hollow in the middle. When it is in water, the entire volume of the ship, including the hollow portion displaces water to make space for itself. The volume of water displaced is much more than the volume of iron in the ship. Therefore, the ship floats in water.
Which of these rules can be deduced from the above given passage?

A If the upthrust is more than the weight, the body sinks in water.
B If the weight is more than the upthrust, the body floats in water.
C If the upthrust is less than the weight, the body floats in water.
D If the weight is more than the upthrust, the body sinks in water.

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Ans 1:

Ayush Banerjee from DAV Pune, Pune

Class : Class 3

Refer Archimedes principle.

Ans 2:

KRITHYA GUPTA from LOTUS VALLEY INTERNATIONAL SCHOOL, NOIDA

Class : Class 7

Ans 3:

Ayantik from Delhi Public School, Hyderabad Begumpet

Class : Class 5

can anyone explain

Ans 4:

Shaurya Veer from Army Public School ASC C and C , Bangalore

Class : Class 10

that's true this is based on Archimedes principle:Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces. Archimedes' principle is a law of physics fundamental to fluid mechanics

Ans 5:

Devabhrith from Delhi Public School Electronic City Bangalore, Bengaluru

Class : Class 8

Archimedes principle

Ans 6:

Ayush Banerjee from DAV Pune, Pune

Class : Class 3

Refer Archimedes principle.

Ans 7:

Kevin Frederick S from Stanes School - ICSE, Coimbatore

Class : Class 5

What is the meaning of upthrust and Archimedes' principle

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Rushika gupta from apeejay school, Faridabad

Subject :NSO Class : Class 5

The heart is made up of muscle tissue. However, the tissue in the heart is different from the tissue in the leg. Infer the reason for the difference.

A The heart must beat all the time, so its tissue should be able to contract and relax continuously without getting tired.
B The leg is much larger than the heart, so the tissue in the leg muscle needs to contain larger cells.
C A person can voluntarily control contraction of heart muscles but not leg muscles.
D The heart muscle is surrounded by blood vessels, so the blood makes it look different from the leg muscle.

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Ans 1:

UMANG from spring dale college, Lucknow

Class : Class 7

Answer is A because the heart has cardiac muscles that comes in involuntary muscles work on their own and they continue to beat without stopping . Unlike involuntary muscles like muscles in legs , arms etc. work on signals given by brain

Ans 2:

Manasvi Nagpal from blooming dales international school, sri ganganagar

Class : Class 5

OF COURSE ITS A

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Shayan Bari from Kendriya Vidyalaya, Katihar

Subject :NSO Class : Class 6

Refer the given three plants P, Q and R.

Which of the following is a suitable statement for the given plants?

(A) P and R produce food, while Q does not

(B) P and Q produce oxygen, while R does not

(C) P is a shrub, Q is a herb, while R is a tree

(D) Leaves of P and Q show parallel venation, while that of R shows reticulate venation

Banana shows reticulated venation

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svayumbhu sharma from jodhamal public school, jammu

Subject :NSO Class : Class 8

The force required to start an object sliding across a uniform horizontal surface is larger than the force required to keep the object sliding at a constant velocity. The magnitudes of the required forces are different in these situations because the force of kinetic friction

AIs greater than the force of static friction.
BIs less than the force of static friction.
CIncreases as the speed of the object relative to the surface increases.
DDecreases as the speed of the object relative to the surface increases.

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Admin fly from Ddssxxx, Ax

Subject :NSO Class : Class 6

Which of the following is a common character among the given animals?

A They all respire by gills.
B They all have streamlined body.
C They all lay eggs.
D They all have slippery scales over body.

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Ans 1:

S Sujan Chakravarthi from CLM Sishya OMR, Chennai

Class : Class 10

option-c

Ans 2:

S Sujan Chakravarthi from CLM Sishya OMR, Chennai

Class : Class 10

because all lay eggs

Ans 3:

Sruthi from Suguna International School, Coimbatore

Class : Class 6

Option C It is because all of them lay eggs.

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TRIYA SOUMIK NATH from SYMBIOSIS PRIMARY SCHOOL, PUNE

Subject :NSO Class : Class 7

Which of the following diagrams shows the correct wind flow pattern because of uneven heating of the earth?

A

B

C

D

Yes, the correct answer is A but the direction of winds in the polar region is given quite small and is not visible properly. The order is equator i.e. 0 degree, 30 degree North and South, 60 degree North and South and the poles i.e. 90 degree.

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Pratibha Gratus from dps north, Bangalore

Subject :NSO Class : Class 4

The fur of some animals becomes thicker in the winter and is shed in the spring. These observations show how animals

A Respond to changes in the environment
B Move from place to place to survive
C Store fat for the winter
D Compete with other animals for food.

Gððð Question

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Ans 1:

Shruthi from VIBGYOR, Mumbai

Class : Class 6

Ans 2:

AAYANSH from SMT.L.B.JOSHI ENGLISH HIGH SCHOOL, Thane

Class : Class 4

Ans 3:

arjun gupta from st kabir public school, Chandigarh

Class : Class 4

A

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Tanihq Nagirkar from SNBP, PUNE

Subject :NSO Class : Class 8

Select the option that correctly identifies the given species as extinct (P), critically endangered (Q) and vulnerable (R) according to IUCN Red List.

	P	Q	R
A	Asiatic wild ass	Indian gazelle	Lion tailed macaque
B	Dodo	One horned rhinoceros	Chinkara deer
C	Passenger pigeon	Ivory-billed woodpecker	Bare-faced curassow
D	Silvery pigeon	Blackbuck	Red panda

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