National Science Olympiad Forum By SOF Olympiad Trainer - Page 376

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 8
Bb

Ans 2:

Class : Class 3
D

Ans 3:

Class : Class 4
d

Ans 4:

Class : Class 7
B

Ans 5:

Class : Class 4
b

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Subject :NSO    Class : Class 10

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 2
how

Ans 2:

Class : Class 3

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 7

Ans 2:

Class : Class 3
ddddddddddd

Ans 3:

Class : Class 7

Ans 4:

Class : Class 5

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 5
C

Ans 2:

Class : Class 3
C

Ans 3:

Class : Class 4

Ans 4:

Class : Class 4
c

Ans 5:

Class : Class 4
C

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 8

Ans 2:

Class : Class 4
Incubation C Is the answer

Ans 3:

Class : Class 5
Answer is hatching.

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Subject :NSO    Class : Class 9

Ans 1:

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:

Class : Class 9

Ans 3:

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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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:

Class : Class 8

Ans 2:

Class : Class 10
Answer should be either B or c because both of them are incorrect

Ans 3:

Class : Class 9
(D) is correct

Ans 4:

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 5:

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 6:

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 7:

Class : Class 9
(a) is no doubt right, (b) may be wrong, (c) is right and (d) is also right.

Ans 8:

Class : Class 10

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Subject :NSO    Class : Class 9

Ans 1:

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:

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 3:

Class : Class 8

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