National Science Olympiad Forum By SOF Olympiad Trainer

SANVI from D PS VADODARA, Vadodara

Subject :NSO Class : Class 8

Consider the following statements (a - d) each with one or two blanks.
I. In our body, __(1)__ is the longest cell while __(2)__ is the smallest cell.
II. Cell membrane in animal cells is __(3)__
III. Mitochondria is absent in ___(4)__
IV. __(5)__ are membraneless organelles of cell and are involved in synthesis of __(6)__
Select the correct option to fill any three or four blanks.

A1 - Neuron, 2 - PPLO, 4 - bacteria
B3 - Permeable, 5 - Ribosomes, 6 - proteins
C3 - Selectively permeable, 1 - Neuron, 4 - RBC
D3 - Impermeable, 4 - human RBC, 6 - lipids

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Ans 1:

Shreyam Tripathy from Ann Mary School, Dehradun

Class : Class 10

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Ashi Goyal from Sacred heart convent school,raikot road,barnala, punjab

Subject :NSO Class : Class 6

Change X : Cooling a mixture of air and kerosene vapours so that liquid kerosene condenses out. Change Y : Burning a mixture of air and kerosene vapours.
What type of changes X and Y are?

AX - Chemical change, Y - Reversible change
BX - Physical change, Y - Chemical change
CX - Chemical change, Y - Physical change
DX - Reversible change, Y - Physical change

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Ans 1:

Aarav Gupta from Cambridge International School, Jalandhar

Class : Class 6

d canbe the answer

Ans 2:

Siddhartha from Gyanfort school, Farrukhabad

Class : Class 6

D option can be correct.

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Ashi Goyal from Sacred heart convent school,raikot road,barnala, punjab

Subject :NSO Class : Class 6

Which of the following statements are true?
(i) A shadow is formed on the same side of the object as the source of light.
(ii) The image formed by a pinhole camera is always erect.
(iii) We see stars because they reflect light from the sun.
(iv) The shadow of a pole is longest in the evening and shortest at the noon.
(v) Mirrors are good reflectors of light.

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

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Ans 1: (Master Answer)

from ,

Class :

C

A shadow is formed on the other side of the object as the source of light. The image formed by pin hole camera are inverted ,smaller and real. We see stars because they have light of their own.

Ans 2: (Master Answer)

from ,

Class :

C

A shadow is formed on the other side of the object as the source of light. The image formed by pin hole camera are inverted ,smaller and real. We see stars because they have light of their own.

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Arav Jain from Global edge school, Hyderabad

Subject :NSO Class : Class 7

Read the given passage where some of the words have been italicised. Pure wool has the natural ability to undergo biodegradation. Due to its low water and nitrogen content, wool naturally resists fire. When wool is heated, it melts and gives smell of charred meat. Wool is obtained from sheep, goat, camel, yak, rabbit etc. Angora wool is obtained from Angora goat whereas mohair is obtained from Angora rabbit. Cashmere is a fine, strong, light and soft wool obtained from yak.
Select the incorrect statement regarding this.

ALow should be replaced with high.
BMelts should be replaced by burns whereas charred meat should be replaced with burning hair.
CPositions of Angora wool and mohair should be interchanged.
DYak should be replaced with camel.

I think this Questions answer is wrong

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Ans 1:

Tanav from Jodhamal Public School, Jammu

Class : Class 7

the answer is b c d

Ans 2:

Sainyam Sharma from Thakur Public School, Mumbai

Class : Class 9

c

Ans 3:

Arav Jain from Global edge school, Hyderabad

Class : Class 5

Ans 4:

Bhumi Chheda from SVKM J V Parekh International School, Mumbai

Class : Class 9

The answer should be B right?

Ans 5:

mughilan from NCFE, BANGALORE

Class : Class 9

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Shweta Garg from Vibgyor high, Vadodara

Subject :NSO Class : Class 6

In which of the following groups, odd one out is circled incorrectly?

ASand, Sandust, Talcum powder
BWood, Plastic, Aluminium,
C Iron, Copper, Zinc
DGlass marble, Stapler pin, Needle

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Ans 1: (Master Answer)

from ,

Class :

B

Sand, Sawdust and Talcum Powder particles are not soluble in water. Sugar particles are soluble in water. So, sugar is the odd one out, and it is circled correctly.
Wood, Plastic and Rubber are non-metals, while Aluminium is a metal. So, Aluminium is the odd one out. That means Rubber is circled incorrectly.
Iron, Copper, Zinc and Mercury – all are solid metals. But Mercury is the only metal that is liquid at standard temperature and pressure. So, mercury is the odd one out, and it is circled correctly.
Glass Marble, Stapler Pin and Needle are objects shapes and manufactured by men. Feather is a naturally occurring object. So, feather is the odd one out, and it is circled correctly.

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Shweta Garg from Vibgyor high, Vadodara

Subject :NSO Class : Class 6

A few processes are listed in the table.

Which of the processes listed in the table can be used to separate solids from liquids?

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

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Ans 1:

Shivansh Pant from National Center For Excellence, Bangalore

Class : Class 10

distillation separates liquid from liquid(soluble) and it can't be option d....please verify it Sof!!!

Ans 2:

Shivansh Pant from National Center For Excellence, Bangalore

Class : Class 10

sorry,it's d

Ans 3: (Master Answer)

from ,

Class :

D

Ans 4:

Parimal from IMS School, solapur

Class : Class 6

distillation is process from liquid to liquid but in answer it is there how because question is like this process from solid from liquid D is wrong

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Shweta Garg from Vibgyor high, Vadodara

Subject :NSO Class : Class 6

_________ can be recharged, but _________ cannot be recharged. Chemical reactions involved in primary cells are _________ and in secondary cells are _________.

APrimary cells, secondary cells, irreversible, reversible.
BSecondary cells, primary cells, irreversible, reversible.
CSecondary cells, primary cells, reversible, irreversible.
DPrimary cells, secondary cells, reversible, irreversible.

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Ans 1:

Aarav Gupta from Cambridge International School, Jalandhar

Class : Class 6

b

Ans 2: (Master Answer)

from ,

Class :

B

The chemical reaction in a primary cell is irreversible and hence cannot be recharged , while in secondary cells the chemical reaction involved can be reversed i.e it can be recharged.

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KESHAV YADAV from BONNE ANNE PUBLIC SCHOOL, MORADABAD

Subject :NSO Class : Class 4

Refer to the given Venn diagram and select the INCORRECT option regarding organs P, Q and R.

A P could be a muscular organ which churns the food and helps in mixing it with acid.
B Q receives digestive juices from R and liver for complete digestion of all food components.
C R could be pancreas which secretes different digestive juices for digestion of proteins, fats and carbohydrates.
D P could be large intestine which is the longest and widest part of the gut.

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Ans 1:

KESHAV YADAV from BONNE ANNE PUBLIC SCHOOL, MORADABAD

Class : Class 4

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sujata patel from Podar International, Pune

Subject :NSO Class : Class 6

Which of the following statements hold true for the root system shown in the given figure?

(i) It is a fibrous root system.
(ii) The branches that arise from the main root are called fibrous roots.
(iii) It is a tap root system.
(iv) Examples of this type of root system are pea, tulsi, radish, carrot and turnip.

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

If 'D' is the correct option then the '2nd statement' must be-The branches that arise from the main root are called 'tap' root. Or the correct option must be C as the above all examples of tap root only. The question or the answer expected is wrong then it will affect the marks of the students whether it may be of 1 mark or of 3 marks. Please take my statements into consideration and do something as soon as possibleRegards Serene patel,Daughter of Sujata patel.

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Ans 1:

sujata patel from Podar International, Pune

Class : Class 6

C is the answer

Ans 2:

Shashwat Amit from ,

Class : Class 6

The roots coming out from the main root are called lateral roots not fibrous roots so option “c” is the correct answer

Ans 3:

ANANYA SHAH from UDGAM SCHOOL FOR CHILDREN , AHMEDABAD

Class : Class 8

can someone e-x-p-l-a-i-ncan someone e-x-p-l-a-i-n

Ans 4:

Aadvik saini from Mvn sector 17, Faridabad

Class : Class 8

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Angel Kansal from BAL BHARATI PUBLIC SCHOOL, DELHI

Subject :NSO Class : Class 7

A few substances are listed in the box.

(i) Sulphuric acid
(ii) Sodium bicarbonate
(iii) Sodium hydroxide
(iv) Ammonium hydroxide
(v) Sodium sulphate
(vi) Ammonium sulphate
(vii) Sodium chloride
(viii) Formic acid
(ix) Tartaric acid
(x) Nitric acid

Now, read the given passage and select the correct option. Substances __(p)__ are strong mineral acids while substances __(q)__ are weak organic acids. Aqueous solutions of substances __(r)__ will turn China rose indicator green while substances __(s)__ will have no effect on China rose indicator.

	(p)	(q)	(r)	(s)
A	(i), (x)	(viii), (ix)	(ii), (iii), (iv)	(v), (vii)
B	(i), (iii)	(v), (vii)	(ii), (viii), (x)	(iv), (vi), (ix)
C	(ii), (v)	(iii), (vii), (ix)	(i), (vi)	(iv), (viii), (x)
D	(i), (iii)	(viii), (ix), (x)	(ii), (v), (vii)	(iv), (vi)

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Ans 1:

UMA Subramanian from Global Indian International School, Singapore

Class : Class 7

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