National Science Olympiad Forum By SOF Olympiad Trainer - Page 602

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 3
IT IS A VERY VERY WRONG QUESTION

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Subject :NSO    Class : Class 10

Which of the following statements are incorrect?
I. Reactivity of Al decreases if it is dipped in nitric acid.
II. Carbon can reduce the oxides of Na and Mg.
III. NaCl is a good conductor of electricity in solid state.
IV. Metals like K, Ca and Mg are always found in free state in nature.

A I, II and III only
B II, III and IV only
C I and III only
D II and III only


common salt can never conduct electricity in solid state

Ans 1:

Class : Class 10
B) II,III,IV CARBON can reduce oxides of metals lower in the activity series. K, Ca and Mg are high in the activity series so they are very reactive so they can not be found in free state easily.

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8
Ans is D

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 5
I do not think wheat and rice contain iodine. please let me know

Ans 2:

Class : Class 5
Potato and ghee

Ans 3:

Class : Class 6
potato and ghee

Ans 4:

Class : Class 7
The iodine test is used to test for the presence of starch. Starch is a type of carbohydrate. Now, let’s see which of the following food products have starch, and will give positive iodine test: A. Milk and Pulses ----- Milk and Pulses are rich in proteins, so they will not give positive iodine test. B. Rice and Wheat ----- Rice and Wheat are grains, which are rich in carbohydrates. So, they will have starch and give positive iodine test. C. Banana and Coconut Oil ----- Banana is rich in carbohydrates, so it will give positive iodine test. But Coconut Oil is rich is fats, so it will not give positive iodine test. D. Potato and Ghee ----- Potato is rich in carbohydrates, so it will give positive iodine test. But Ghee is rich is fats, so it will not give positive iodine test. Hence, the correct answer is Option B, since both Rice and Wheat will give positive iodine test.

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 8

Ans 2:

Class : Class 6

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7

Ans 2:

Class : Class 8

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8

Ans 2:

Class : Class 7
Yeah The ribbon is folded so it will 10 cm [5cm x 2]

Ans 3:

Class : Class 7
But the solution is talking about another question .

Ans 4:

Class : Class 6
It will ten centimetres because the length of this is 5 cm [7-2] .

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 10

Observe the given experimental set-up carefully.
image
Which of the following could be the possible observation and inference drawn?

A The solution becomes blue-green due to formation of copper oxide, P is acidic.
B The solution becomes blue-green due to formation of copper chloride, P is basic.
C The solution becomes white due to formation of calcium hydroxide, P is basic.
D The solution becomes white due to formation of calcium oxide, P is acidic.


the correct answer should be (b) because copper cant displace h2 from HCl

Ans 1: (Master Answer)

Class : Class 1
Yes, the correct answer is B.

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
C auto motor other we should ride

Ans 2:

Class : Class 8

Ans 3:

Class : Class 8
Answer is C

Ans 4:

Class : Class 5

Ans 5:

Class : Class 8
The Answer is C. NOW THE QUESTION IS HOW? THE ANSWER IS THE MACHINES SHOWN IN PICTURE A,B,D RUNS BY MUSCULAR . FORCE. THE OPTION C RUNS BY MOTOR.

Ans 6:

Class : Class 6
c

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