National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
i think b is the correct answer

Ans 2:

Class : Class 7
There is no proper solution for this question which will make it more confusing as everyone will have different opinions in this question.

Ans 3:

Class : Class 8
why?

Ans 4:

Class : Class 7
I THINK THAT B IS ONLY THE CORRECT ANSWER

Ans 5:

Class : Class 7

Ans 6:

Class : Class 8
It cools towards room temperature so it does not freeze

Ans 7:

Class : Class 8
at 4 degree celsius water starts expanding and 'x' shows the same the room temperature might have been near or equal to the freezing point of water(eg room temperature of regions like arctic and antarctic)

Ans 8:

Class : Class 6
b is the correct answer

Ans 9:

Class : Class 7
I think B is the correct answer because there is no solidification taking place or else the water would have turned into ice. plus no solidification can take place when water is at room temperature.

Ans 10:

Class : Class 8
Also freezing and melting point of water is 0 degrees celsius

Ans 11:

Class : Class 8
It is cooling towards room temperature so it does not solidify since the freezing point is below room temperature.

Ans 12:

Class : Class 7
B is the correct answer

Ans 13:

Class : Class 7
i think b is the correct answer

Ans 14:

Class : Class 8
i think b is correct

Ans 15:

Class : Class 8
I think b is correct because there is no solidification

Ans 16:

Class : Class 7
B should be the correct answer I think

Ans 17:

Class : Class 7
Three states - gas , liquid & solid When hot water temp is going down it will be ultimate become solid ie ice But before becoming ice temp will stagnant for some time where in both states liquid & solid co-exist==> some part of liquid is in ice form. X is the same state where in solid and liquid will co-exist. Hence option 4 is correct(solidification& evaporation) Note: Could not attach gif .It would have made it more clear.

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3

Ans 2:

Class : Class 5
b

Ans 3:

Class : Class 4
The answer is gibbous moon.

Ans 4:

Class : Class 5

Ans 5:

Class : Class 3
okkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 7
A

Ans 2:

Class : Class 5
a

Ans 3:

Class : Class 5
a is right

Ans 4:

Class : Class 7
A

Ans 5: (Master Answer)

Class : Class 1

The correct answer is A.

Both plants ‘c’ and ‘d’ bear fruits. This means they are flowering plants as only flowers change into fruits. Plant ‘c’ grows in water i.e., it is an aquatic plant but plant ‘d’ does not grow in water thus, it is a nonaquatic plant. Hence 'W' and 'X' represent plant ‘c’ and ‘d’ respectively.


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Subject :NSO    Class : Class 8

There are two different solutions in set up P and Q as shown in figure. The bulb in the set up P glows more brightly as compared to that of the set up Q. What are the possible causes for this?

(i) The connections of the circuit Q may be loose.
(ii) The liquid in Q may have small conductivity.
(iii) Liquid in P is equivalent to a battery while liquid in Q is equivalent to a cell of the battery of liquid P.

A Only (i) and (ii)
B Only (ii) and (iii)
C Only (i)
D Only (ii)


I don't understand (iii)

Ans 1:

Class : Class 8
It’s not mentioned about tightness of the circuits.

Ans 2:

Class : Class 9
but how do we know that the circuit is conneced tightly???

Ans 3:

Class : Class 8
How can a liquid be equal to a battery and another liquid be equal to *its* cell?

Ans 4:

Class : Class 8
How can a liquid be equal to a battery and another liquid be equal to *its* cell?

Ans 5: (Master Answer)

Class : Class 1

The correct answer is B

In given figures, both the circuits are tightly connected and both the liquids conduct electricity because both the bulbs are glowing. The bulb in the set up P glows more brightly as compared to that of the set up Q might be because of any of the two possibilities:

1. The liquid in Q may have small conductivity. 

2.  Liquid in P is equivalent to a battery while liquid in Q is equivalent to a cell of the battery of liquid P


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Subject :NSO    Class : Class 4
Hi

Ans 1: (Master Answer)

Class : Class 1

Plaese mention your query


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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
Drying is the answer !

Ans 2:

Class : Class 4
aayman please can you come online

Ans 3:

Class : Class 3
Drying is the answer From aayman

Ans 4:

Class : Class 3
the answer of this question is drawing because when we dry something moisture is removed from it.

Ans 5:

Class : Class 4
Well shiven

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Subject :NSO    Class : Class 8

To every action there is always an equal and opposite reaction. Which of the following statements is correct regarding this?

A The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless.
B The horse pulls the buggy forward slightly harder than the buggy pulls the horse backward, so they move forward.
C The horse can pull the buggy forward only if the horse weighs more than the buggy.
D None of these


Does anybody know the solution?

Ans 1:

Class : Class 8
it is one

Ans 2:

Class : Class 8

Ans 3:

Class : Class 8
Ans.- (A) The buggy pulls the horse as backward just as hard the horse pulls the buggy forward. According to the IIIrd law of NLM( Newton's Laws of Motion), the action and reaction force takes place in two different bodies, in different direction , but of the same magnitude.

Ans 4:

Class : Class 8

Ans 5:

Class : Class 8
Answer A will be correct if you take newtons third law of motion into consideration

Ans 6: (Master Answer)

Class : Class 1

The correct answer is A.

The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless. 


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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
In the given Venn diagram X, Y and Z represent vitamin D, vitamin E and vitamin K, respectively. Deficiency of vitamin A causes night blindness and deficiency of vitamin C causes scurvy. Pellagra is caused by deficiency of vitamin B3. Vitamin B is a group of several vitamins like B1, B2, B3, B6, B12 and folic acid and is known as vitamin B complex.

Ans 2:

Class : Class 6

Ans 3:

Class : Class 6
B

Ans 4:

Class : Class 6

Ans 5: (Master Answer)

Class : Class 1

The correct answer is B.

In the given Venn diagram X, Y and Z represent vitamin D, vitamin E and vitamin K, respectively. Deficiency of vitamin A causes night blindness and deficiency of vitamin C causes scurvy. Pellagra is caused by deficiency of vitamin B3. Vitamin B is a group of several vitamins like B1, B2, B3, B6, B12 and folic acid and is known as vitamin B complex.


Ans 6:

Class : Class 6

Ans 7:

Class : Class 8
EASY PEASY LEMON SQUEEZY!

Ans 8:

Class : Class 7

Ans 9:

Class : Class 6
In the given Venn diagram X, Y and Z represent vitamin D, vitamin E and vitamin K, respectively. Deficiency of vitamin A causes night blindness and deficiency of vitamin C causes scurvy. Pellagra is caused by deficiency of vitamin B3. Vitamin B is a group of several vitamins like B1, B2, B3, B6, B12 and folic acid and is known as vitamin B complex.

Ans 10:

Class : Class 4
What about vitamin A which is also fat soluble and also stored in fat tissues. The answer should be 'D' because the group Y consists of both vitamin A and vitamin E

Ans 11:

Class : Class 4
What about vitamin A which is also fat soluble and also stored in

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
very intelligent question , and answers too

Ans 2:

Class : Class 5
d

Ans 3:

Class : Class 5

Ans 4:

Class : Class 4

Ans 5:

Class : Class 3
D

Ans 6:

Class : Class 5

Ans 7:

Class : Class 7
D

Ans 8:

Class : Class 4
Explain how and why D?

Ans 9:

Class : Class 2
why d please explain

Ans 10:

Class : Class 4

Ans 11: (Master Answer)

Class : Class 1

The correct answer is D.

X is oesophagus with no change in amount of undigested food. Y is stomach and Z is small intestine with decreasing amount of undigested food and P is large intestine as no further digestion occurs here.


Ans 12:

Class : Class 4

Ans 13:

Class : Class 4

Ans 14:

Class : Class 5

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Subject :NSO    Class : Class 9

A unicellular protist X, which has contractile vacuole to remove excess intracellular water, was placed in salt solution of increasing osmolarity. The given graph shows the rate of contraction of vacuole to pump out excess water against osmolarity of solution.
Select the option that gives the correct explanation of the data.


A In an isotonic solution there is no diffusion of water in or out of the X, so the contraction rate is zero.
B At higher osmolarity, more salt diffuses into X, therefore lower rates of contractions are required.
C The rate of contraction increases as osmolarity decreases because amount of water entering X by osmosis increases.
D The contractile vacuole is less efficient in solution of high osmolarity because of reduced respiration and less production of ATP.


what s the answer

Ans 1:

Class : Class 9
what is osmolarity

Ans 2:

Class : Class 9
the concentration of a solution expressed as the total number of solute particles per litre.

Ans 3: (Master Answer)

Class : Class 1

The answer is C

The rate of contraction increases as osmolarity decreases because amount of water entering X by osmosis increases. 


Ans 4:

Class : Class 9
amount of water entering the cell is osmolarity

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