National Science Olympiad Forum By SOF Olympiad Trainer - Page 545

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
D

Ans 2:

Class : Class 8
D

Ans 3:

Class : Class 9
It IS A.

Ans 4:

Class : Class 8
Can someone please explain why the answer is A?

Ans 5:

Class : Class 5
Explain with diagram in the solution.

Ans 6:

Class : Class 9
I don't understand how it is A. Both the wheels move in the same direction. It can't be C as the wheels are moving in the forward direction hence it is none of the above.

Ans 7:

Class : Class 8
How will the bicycle move if one wheel is moving forward and other backward ?

Ans 8:

Class : Class 8

Ans 9:

Class : Class 9

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
22

Ans 2:

Class : Class 4
D

Ans 3:

Class : Class 4
22

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
Yes they do.

Ans 2: (Master Answer)

Class : Class 1
Yes!!

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
I will go with A

Ans 2:

Class : Class 8
(a)p

Ans 3:

Class : Class 7
I will go with A

Ans 4:

Class : Class 9
R

Ans 5:

Class : Class 10
R

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Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Class : Class 1
The correct answer is B. The pattern is in increasing powers of 5.

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Subject :NSO    Class : Class 8

Few statements are given below. Identify the incorrect statements and mark the appropriate option.
(i) In fractional distillation of petroleum, hydrocarbon with lowest boiling point condenses first.
(ii) Useful substances obtained from petroleum and natural gas are termed as ‘Petrochemicals’.
(iii) Coke is used in the extraction of many metals.
(iv) Paraffin wax used in candles, vaseline, grease, polish is obtained by destructive distillation of coal.

A (i) and (ii)
B (i) and (iv)
C (i), (ii) and (iii)
D (ii) and (iv)


It should be d

Ans 1: (Master Answer)

Class : Class 1
The correct answer is B.

Ans 2:

Class : Class 8

Ans 3:

Class : Class 6

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 5
c

Ans 2:

Class : Class 9
C

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6

Ans 2:

Class : Class 3
Flowers should always be bright coloured to attract insects

Ans 3:

Class : Class 7

Ans 4:

Class : Class 8
Opt. B is incorrect as the stigmas in wind pollinated flowers is dull colored.

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Subject :NSO    Class : Class 5

Raman took four similar pots (with a hole at the base) each with equal amount of different type of soil. He then placed these four pots on four similar dishes and poured water slowly on each soil sample. He used a stopwatch to measure the time taken by water to reach the level, he had marked at the same height in each dish.

The results obtained by him were tabulated in the table shown here.
Which soil is the most suitable for a plant that thrives in sandy soil ?

AW
BX
CY
DZ


Ans 1:

Class : Class 8
answer should be y.

Ans 2:

Class : Class 4
Raman took four similar pots (with a hole at the base) each with equal amount of different type of soil. He then placed these four pots on four similar dishes and poured water slowly on each soil sample. He used a stopwatch to measure the time taken by water to reach the level he had marked at the same height in each dish. The results obtained by him were tabulated in the table shown . The soil whose particles are fine and are closely packed together will not have much space between the particles. So, water will pass slowly through such soil, and will take more time to reach the marked level. On the other hand, the soil whose particles are big and are loosely held together – like sandy soil - will have ample space between the particles. So, water will pass easily through such soil, and will take less time to reach the marked level. The table shows that the water has taken the least amount of time – 35 seconds – to pass through Soil Y and reach the marked level. That means Soil Y will be most suitable for the plant which thrives in sandy soil. Hence, the correct answer is Option C.

Ans 3:

Class : Class 5
Answer should be (A) because the soil from which the water took 35 seconds to pass, must be gravel as we all have read that there are 4 types of soils 1)gravel 2)sandy soil 3)loamy soil and 4)clay. Sandy soil comes in 2nd place when you conduct an experiment about the abilities of the quantity of water the type of soil can absorb. so I say that the sandy soil should be the one that let the water pass through it in 48 seconds.

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