National Science Olympiad Forum By SOF Olympiad Trainer - Page 266

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Subject :NSO    Class : Class 6

Soham was given a mixture of camphor, iron filings, sawdust and salt.
Which of the following represents the correct sequence of steps to separate all the components of this mixture?

A Winnowing, filtration, separating funnel and magnetic separation
B Sedimentation and decantation, heating, filtration and evaporation
C Magnetic separation, heating, filtration and evaporation
D Sedimentation and decantation, handpicking, filtration and evaporation


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Subject :NSO    Class : Class 5

Refer to the given flow chart and select the incorrect option.


APart P will help a student think, learn and recall her lessons.
BPart Q will help a child to learn the art of riding a bicycle.
CPart R controls our breathing and heartbeat even when we are asleep.
DPart Q will help a person retract his hand when touched by a hot object.


now this is wron' 'cause i, option D it is written part Q but in the solution it's written par' Q plz correc' thi'

Ans 1:

Class : Class 5
wrong!!!!!!! BLUNDER BY SOF!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 2:

Class : Class 5
wrong question

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
not available to identify

Ans 2:

Class : Class 8
exactly Arav . they should give it clearly. its to small. and they should mention in synopsis about various parts...

Ans 3:

Class : Class 3

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Subject :NSO    Class : Class 6

Which of the following statements are correct?
(i) The colour of light will affect the characteristics of the shadow.
(ii) If light is allowed to pass through a piece of muslin cloth, a lighter shadow will be formed.
(iii) The magnetic properties are induced into an iron bar till the magnet is kept near it.
(iv) Bulb has only one terminal to connect the filament with the circuit.

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


Color of shadow will change with color of light. So, (i) is also correct.

Ans 1: (Master Answer)

Class : Class 1

C

Colour of an object doesn' t affect the colour of its shadow .It is faint and dark depending upon the amount light falling on the screen.

The iron rod behaves like a magnet so long as it is kept near the magnet. When the magnet is removed, the iron rod loses its magnetic property.

An electric bulb has two two terminals.


Ans 2:

Class : Class 4

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Class : Class 1

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0124-6601200

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Subject :NSO    Class : Class 6

Class teacher gave four different samples of fibres to four students. Ria has fibre H, which is obtained from plant that grows best in alluvial soil in warm and humid climates. Fibre I given to Sumit gives smell of burning hair on being burnt and has ability to trap air and heat, while fibre J given to Kanika, is a fibre obtained from an insect. Fibre K given to Rahul burns with smell of burning plastic. Identify the fibres H, I, J and K and select the correct option regarding them.

AFibre H is the cheapest vegetable fibre and is also known as golden fibre.
BFibre I is obtained from passion vine and can be worn both in summers and winters.
CFibre J does not absorb water at all hence is used in making raincoats.
DFabric made of fibre K can absorb sweat, thus is comfortable to wear in hot and humid weather.


A

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7
the answer is also incorrect

Ans 2:

Class : Class 2
photo not visable answer not correct we understand broo

Ans 3:

Class : Class 7
The photos are not clear!!!

Ans 4:

Class : Class 3
Photos are not clear!!!!

Ans 5:

Class : Class 6

Ans 6:

Class : Class 6
D

Ans 7:

Class : Class 6
yes, the photos are not clear !!!

Ans 8:

Class : Class 8

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 5
Mistake - grapevine is a climber not creeper

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Subject :NSO    Class : Class 6

The given figure shows different arrangements of particles of an unknown substance undergoing changes I, II, III and IV.

Fill in the blanks by choosing an appropriate option. The change(s) (p) involve(s) absorption of heat while change(s) (q) involve(s) evolution of heat. In all these changes, (r) of the substance remains constant.

(p) (q) (r)
A I, II III, IV Volume
B III I, II, IV Mass
C I, II, IV III Mass
D I, II, IV III Energy


c

Ans 1:

Class : Class 6
Correct answer is C . Because P involved absorbtion of heat 1 liquid to gas ,2solid to liquid ,4solid to gas .Q involved evolution of heat (heat is given)i.e exothermic.gas to liquid.R involved substance remains constant that is Mass .mass remains constant in every medium .i.eas the density of gas decrease so the mass also decrease but it will have same mass everywhere.

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