National Science Olympiad Forum By SOF Olympiad Trainer

Kanishk Mukherjee from BDM International, Kolkata

Subject :NSO Class : Class 6

Three identical bulbs namely P, Q and R are connected to a battery as shown. What will happen when the circuit is closed?

A R will glow bright but Q and P will be dim.
B P, Q and R all will glow equally bright.
C Q and R will immediately burnout.
D P will glow bright, but Q and R will be dim.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

D

When the key K is closed, an electric current starts flowing in the circuit . The current which passes through bulb P gets divided in bulbs Q and R. For the identical bulbs , the brightness will depend upon the current flowing through the bulbs,So P will glow brighter than Q and R .

Ans 2:

malhar thorve from city internqtional school, satara road, pune

Class : Class 6

Ans 3:

SOUVAGYA SAHA from De Nobili School, DHANBAD

Class : Class 10

the current starts flowing from positive end to negative end in a closed circuit and in this case , current first gets divided and passes through Q and R and then the current again gets add up and passes through p. so due to the greater flow of current through P it is more brighter.

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Kanishk Mukherjee from BDM International, Kolkata

Subject :NSO Class : Class 6

Look at the Venn diagram. Which of the following objects described below are most likely to be I, II and III? Choose the correct option.

	I	II	III
A	Oiled paper	Air	Cellophane paper
B	Glass	Frosted glass	Wood
C	Wax paper	Clean water	Diamond
D	Mirror	Diamond	Lamp

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

Transparent objects allow the light to pass through it completely , while the translucent passes the light partially .

An object is categorised as opaque if it completely blocks the light falling on it.

Hence, B is the correct option.

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Pratheek from Null, Null

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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harry potter from Hogwarts school of witchcraft and wizardry , london

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'

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Ans 1:

Ridhan from SFS janakpuri, New Delhi

Class : Class 5

wrong question

Ans 2:

harry potter from Hogwarts school of witchcraft and wizardry , london

Class : Class 5

wrong!!!!!!! BLUNDER BY SOF!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Shubhi Vats from Kendriya Vidyalaya Ordnance Factory Chanda, Bhadrawati

Subject :NSO Class : Class 7

Refer to the given figure of human digestive system. What is X here and what is its function?

A Small intestine - Absorbs nutrients from digested food
B Stomach - Breaks down food using acids and enzymes
C Appendix - Has no specific function in the body
D Rectum - Temporary storage of faeces before being expelled out of the body.

i don't know the function of appendix.

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Ans 1:

Rithvik from BVM Global, Chennai

Class : Class 9

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

Ans 2:

ABCDE from admin, Noida

Class : Class 4

Ans 3:

Arav saraf from lotus valley international school, NOIDA

Class : Class 7

not available to identify

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chittaranjan kar from MLZS, Jaipur

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.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

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:

Rishit goyal from St Peter's College, Agra

Class : Class 8

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Sai shankar S from geethanjali vidyalaya, Bangalore

Subject :NSO Class : Class 7

Read the given flow chart and identify the animals,W, X, Y and Z.

	W	X	Y	Z
A	Asian elephant	Penguin	Kangaroo rat	Red-eyed frog
B	Polar bear	Siberian crane	Camel	Toucan
C	Fennec	Arctic tern	Giant panda	Orangutan
D	Jaguar	Swallow	Ground squirrel	Sloth

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k tagore from montessori school, KURNOOL

Subject :NSO Class : Class 3

dear sir i completed my level 2 model papers preparation, how can i get again model papers to practice

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

Please visit our website: www.mtg.in

Or reach us on

Telephone

0124-6601200

Email
info@mtg.in

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Amrik Pal from Kendriya Vidyalaya DRDO, Bangalore

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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Ans 1:

Ayush singh from New rainbow public School, Ghaziabad

Class : Class 6

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Amrik Pal from Kendriya Vidyalaya DRDO, Bangalore

Subject :NSO Class : Class 6

Given images show various steps in processing of cotton fibre into fabric. Arrange these steps in correct sequence.

A(iv) → (iii) → (ii) → (i) → (v)
B(iv) → (ii) → (v) → (iii) → (i)
C(iv) → (ii) → (iii) → (v) → (i)
D(iv) → (i) → (ii) → (v) → (iii)