National Science Olympiad Forum By SOF Olympiad Trainer - Page 429
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Ujjayan Pal from Don Bosco School, Agartala
Subject :NSO    Class : Class 10

Ans 1:

Ronish from Ryan, Chandigarh
Class : Class 10
30 cm

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Ayushree Barman from Sri Sri Academy, Kolkata
Subject :NSO    Class : Class 5

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Saanvi yadav from Saanvi yadav, Ghaziabad
Subject :NSO    Class : Class 5

Ans 1:

Anirudh from Modern senior secondary school , CHENNAI
Class : Class 5

Ans 2:

KRITHYA GUPTA from LOTUS VALLEY INTERNATIONAL SCHOOL, NOIDA
Class : Class 7

Ans 3:

Manasvi pandey from Dps haldwani, Haldwani
Class : Class 3
ddddddddddd

Ans 4:

KRITHYA GUPTA from LOTUS VALLEY INTERNATIONAL SCHOOL, NOIDA
Class : Class 7

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Saanvi yadav from Saanvi yadav, Ghaziabad
Subject :NSO    Class : Class 5

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Riddhima Pandey from Chinmaya Vidyalaya, Bokaro Steel City
Subject :NSO    Class : Class 3

Ans 1:

SIDDHARTH SOMANI from Vibgyor High, Mumbai
Class : Class 5
C

Ans 2:

EASHAAN K SURESH from KANGEER VALLEY ACADEMY, Raipur
Class : Class 5
C

Ans 3:

Aneesh Balaji from BVBARR school, Hyderabad
Class : Class 9

Ans 4:

Aneesh Balaji from BVBARR school, Hyderabad
Class : Class 9
c

Ans 5:

ANSHUL GAJJAR from PODAR INTERNATIONAL SCHOOL, AHMEDABAD
Class : Class 3
C

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shreyash rawat from podar international school, pune
Subject :NSO    Class : Class 4

Ans 1:

Aakanksha devendra ghorpade from Bhavans gvm , Hinganghat
Class : Class 4
Incubation C Is the answer

Ans 2:

shreyash rawat from podar international school, pune
Class : Class 8

Ans 3:

Apoorva Gaurav from DAV, Muzaffarpur
Class : Class 5
Answer is hatching.

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aditya apurva from DAV public School, Duttnagar
Subject :NSO    Class : Class 9

Ans 1:

Aarju Pal from Arambagh Vivekananda Academy, Arambagh
Class : Class 9
yes, (a) is the right answer as due to accelaration by gravity, velocity of any freely falling object will increase continuously. So, (b) is wrong as h1, h2 and h3 are given equal, (c)is wrong too as it is given that covered distance decreases after every 5 seconds, and (d) is also wrong for the same reason.

Ans 2:

ADITYA KISHOR from dps, gaya
Class : Class 9

Ans 3:

Ankur Kumar from Delhi Public School, Ranchi
Class : Class 9
Option D is the correct answer as the ratio between H1 H2 and H3 is 1: 3 : 5.

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from , Nanded
Subject :NSO    Class : Class 9

Few statements regarding the distribution of electrons in the energy shells are given. Which of the following statements is not correct?

A For fourth energy shell (N), the maximum number of electrons is 32 according to 2n2 rule.
B When N is the outermost shell of an atom, it can accommodate a maximum of 8 electrons only.
C The filling of the fourth shell begins even before the third shell is completely filled.
D Fifth shell can accommodate 50 electrons according to 2n2 rule.


Ans 1:

Aarju Pal from Arambagh Vivekananda Academy, Arambagh
Class : Class 9
(a) is no doubt right, (b) may be wrong, (c) is right and (d) is also right.

Ans 2:

Sreyashi Ganguli from Bishop Cotton Girls School, Bengaluru
Class : Class 9
ans should no doubt be c because of the Hund 's rule and also fifth shell does accommodate 50 electrons according to 2n^2 :2*5^2=2*25=50.

Ans 3:

Ankur Kumar from Delhi Public School, Ranchi
Class : Class 9
Option B is wrong . As it is talking of the energy shell. OR might be the question is incorrect as the all the options are correct as per my information.

Ans 4:

smriti khuntia from apeejay school,nerul, navi mumbai
Class : Class 9
C should be the answer! a- 2*4^2=32. b-the outermost shell always has 8 to gain perfect stability or become a noble gas. c-wrong, filling always starts from the first, second, third, THEN fourth. d-2*5^2=50

Ans 5:

from d.g.v. sr. sec. school, rohtak
Class : Class 9
(D) is correct

Ans 6:

Sunita Kundu from Scholars rosary senior secondary school , Rohtak
Class : Class 10

Ans 7:

RUDRANSH from Little Angels High School, Gwalior
Class : Class 8

Ans 8:

Sunita Kundu from Scholars rosary senior secondary school , Rohtak
Class : Class 10
Answer should be either B or c because both of them are incorrect

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Chaitanya Gawade from JPS, Pune
Subject :NSO    Class : Class 9

Ans 1:

Ankur Kumar from Delhi Public School, Ranchi
Class : Class 9
Volume of the solid cube =(25*25*25)/1000000 cubic metre. Mass of the solid cube = the mass of the body which can be placed on it to completely submerge it Density = 0.1kg/ 125*(10)^6=800kg/m^3

Ans 2:

Arnav Bhatnagar from RFS, Navi Mumbai
Class : Class 8

Ans 3:

Ankur Kumar from Delhi Public School, Ranchi
Class : Class 9
Volume of the solid cube =(25*25*25)/1000000 cubic metre. Mass of the solid cube = the mass of the body which can be placed on it to completely submerge it Density = 0.1kg/ 125*(10)^6=800kg/m^3

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Chaitanya Gawade from JPS, Pune
Subject :NSO    Class : Class 9

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