National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 10

Ans 1: (Master Answer)

Class : Class 1
Here, the answer is D. Black residue is obtained in test tubes I and III i.e., iron gets displaced in test tubes I and III. Therefore, metals P and R should be more reactive than iron. No change is observed in test tubes II and IV hence, metals Q and S should be less reactive than iron.

Ans 2:

Class : Class 5
Since the residue obtained was black in colour and we know that only Zinc and Copper on reacting with Iron give a black residue hence the answer is Option D

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Subject :NSO    Class : Class 10

Ans 1:

Class : Class 5
Option D

Ans 2: (Master Answer)

Class : Class 1
Here, the answer is D. The method used to extract metals from the ore in which they are found depends on their reactivity. For example, reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide. The metals low in the reactive series are very less reactive. The oxides of such metals can be reduced to metals by heating alone e.g. mercury is obtained from its ore, cinnabar (HgS), by the process of heating. Metals like iron, zinc, lead etc. occur as sulphides or carbonates in nature. First the ore is converted into its oxide form This is done by either roasting or by calcination. The metal oxide is reduced to metal by using suitable reducing agent such as Carbon.

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5

Ans 2:

Class : Class 3

Ans 3: (Master Answer)

Class : Class 1
Here, Option A shows - Dandelion which is dispersed by wind Option B shows - Lotus which is dispersed by water Option C shows - Xanthium which is dispersed by animals Option D shows - Pea which is dispersed by explosion So, the answer is B.

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Subject :NSO    Class : Class 10

Ans 1: (Master Answer)

Class : Class 1
Here, the answer is (d). The right hand rule can be used to determine the direction of the force on a current-carrying wire placed in an external magnetic field.

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Subject :NSO    Class : Class 2

Ans 1: (Master Answer)

Class : Class 1
Kindly mention your query

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Subject :NSO    Class : Class 8
hi

Ans 1: (Master Answer)

Class : Class 1
Kindly mention your query

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 4
THROUGH NERVES WHICH CARRY THE PAIN STIMULUS

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Subject :NSO    Class : Class 6

Geeta placed three objects made of different materials as shown in the figure. She observed a bright spot of light at (II) but (III) would not get any spot. Then,


A (I) and (II) are made of transparent materials and (III) is made of opaque material.
B (I) is made of transparent material, (II) is made of translucent material and (III) is made of opaque material.
C (I) is made of transparent material, (II) is made of opaque material and (III) is made of either transparent or opaque or translucent material.
D (I) and (II) are made of opaque material and (III) is made of transparent material.


Answer can be B also because (iii) did not get any spot so it should be opaque and (ii) is translucent as a direct source of light is coming from the torch because (i) is transparent.

Ans 1:

Class : Class 6
correct answer is C

Ans 2:

Class : Class 7
IF [I] WILL BE TRANSPARENT ,AS WE KNOW THAT THE MATERIALS WHICH ALLOW LIGHT TO PASS THROUGH THEM ARE CALLED TRANSPARENT SO IF WE CUT OUT A SQUARE TRANSPARENT SHEET FROM A ROLL OF TRANSPARENT ,SURELY THE LIGHT PATCH WILL PASS THROUGH[II]THEN THE [II] MATERIAL SHOULD BE SOMETING WHICH CAN NOT ALLOW LIGHT TO PASS TROUGH IT IT SHOULD BE OPAQUE AND THE LAST SQUARE[III] CAN BE MADE OUT FROM ANY MATERIAL,THUS IT WILL NOT CHANGE THE ANSWER.SO WE CONCLUDE THE CORRECT ANSWER IS C

Ans 3:

Class : Class 7
to my knowledge the ans is c

Ans 4:

Class : Class 7
c

Ans 5:

Class : Class 7
No, the right answer is opt. c because if II is translucent, then it will NOT GET A CLEAR BRIGHT SPOT but a hazy one.

Ans 6:

Class : Class 7
to my knowledge the ans is c

Ans 7:

Class : Class 7
No, the right answer is opt. c because if II is translucent, then it will NOT GET A CLEAR BRIGHT SPOT but a hazy one.

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Subject :NSO    Class : Class 4

The descending order of heat conducting property of four metals a, b, c and d is a > b > c > d.
An experiment was conducted to find out how these different metals, when combined, will conduct heat. A small ball of candle wax was placed on one end and a flame near the other end. The set-ups are shown below. In which set-up will the wax drop off first?

A
B
C
D


Good night images with baby pictures and pics of the page for an email address for the program to be in the process of getting the the one who is the cleverest birbal or gopal bhar ke liye bhi kuch nahi hai kya tu bhi na kabhi to nahi hai kya tu bhi na kabhi to nahi hai kya tu bhi na

Ans 1:

Class : Class 4

Ans 2:

Class : Class 5
That answer is D as b,a and b are the best conductors of heat so the heat would pass through b,a and b faster and it is balanced.Nice question.

Ans 3:

Class : Class 4
class 4

Ans 4: (Master Answer)

Class : Class 1
Kindly mention your query

Ans 5:

Class : Class 4
That answer is D as b,a and b are the best conductors of heat so the heat would pass through b,a and b faster and it is balanced.Nice question.

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 1
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