National Science Olympiad Forum By SOF Olympiad Trainer

mishika tripathi from DPS, Gurugram, Haryana

Subject :NSO Class : Class 4

Rainav prepared two mixtures P and Q as shown here.

Identify the methods that can be used to separate the components of mixtures P and Q.

	P	Q
A	Filtration	Sedimentation and decantation
B	Distillation	Magnetic separation
C	Filtration	Distillation
D	Evaporation and condensation	Filtration

ans is d

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Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon

Subject :NSO Class : Class 4

Kimaya switched on her battery-operated car. The conversion of energy that takes place when this car is switched on, can most likely be represented as ________.

AKinetic energy → Mechanical energy → Chemical energy
BChemical energy → Kinetic energy
CLight energy → Kinetic energy → Sound energy
DLight energy → Sound and Kinetic energy

Why no solution?

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Ans 1:

Divyansh Baladitya Singh from Delhi Public School, Patna, Patna

Class : Class 6

Yes, please explain how answer is B

Ans 2:

mishika tripathi from DPS, Gurugram, Haryana

Class : Class 5

pls explain how ans is B

Ans 3:

Shaswat Agarwal from The Maurya School, Gurgaon

Class : Class 7

the answer is B as the chemical energy is first being used so only B option has the first letter as chemical energy.

Ans 4:

Divyansh Baladitya Singh from Delhi Public School, Patna, Patna

Class : Class 6

Battery has chemical energy which is converted into kinetic energy

Ans 5:

Emma Miriam George from Sophia High School, Bangalore

Class : Class 3

Ans 6:

asmi raut from kohana, kawasaki

Class : Class 4

Ans 7:

Emma Miriam George from Sophia High School, Bangalore

Class : Class 3

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Dushyant Singh from Shree Ram Centenial School, Indore

Subject :NSO Class : Class 6

Study the given Venn diagram and identify the gases (X, Y and Z) present in our atmosphere.

Select the correct option regarding characteristics P, Q and R of these gases.

AP - Supports life on Earth
BR - Do not support combustion
CQ - Form compounds that are components of acid rain
DAll of these

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Ans 1:

Pratham Dave from GNS, Bangalore

Class : Class 7

B

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Dushyant Singh from Shree Ram Centenial School, Indore

Subject :NSO Class : Class 6

Some commonly occurring changes around us are classified in the given table.

S. No.	Change	Reversible change	Physical change
I.	Melting of ice cream	✓	✓
II.	Burning of crackers	✓	✗
III.	Stitching a shirt from a fabric	✓	✓
IV.	Dissolving baking soda in water	✓	✓
V.	Baking of cake	✗	✗
VI.	Curdling of milk	✗	✓

Which of the above changes are classified incorrectly?

AI, II, III and V only
BII, IV and VI only
CI, III and V only
DII, III, IV and VI only

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Ans 1:

Sarang Shete from Amanora School, Pune

Class : Class 8

Ans 2:

Sidharth R Oleti from National Public School HSR, Bangalore

Class : Class 7

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Dushyant Singh from Shree Ram Centenial School, Indore

Subject :NSO Class : Class 6

A glass ball initially rolling at a constant speed, moves up a smooth slope as shown in the figure. Which of the following options is true about its energy as it is rolling up the slope?

	Kinetic energy	Potential energy
A	Remains same	Decreases
B	Increases	Remains same
C	Decreases	Increases
D	Decreases	Decreases

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Dushyant Singh from Shree Ram Centenial School, Indore

Subject :NSO Class : Class 6

Select a figure from the options which is exactly embedded in the given figure as one of its parts.

A
B
C
D

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Ans 1:

Kushagra Chaturvedi from Podar International School Chinchwad, Pune

Class : Class 6

cccccccccccccccccccccccccccccccccccccccccCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

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Dushyant Singh from Shree Ram Centenial School, Indore

Subject :NSO Class : Class 6

In a joint family, there are father, mother, 4 married sons, 2 unmarried sons and three unmarried daughters. Out of the married sons, two have 2 sons each and two have a son and a daughter each. How many male members are there in the family?

A13
B12
C14
D11

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Ans 1:

Kushagra Chaturvedi from Podar International School Chinchwad, Pune

Class : Class 6

Usage?

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Dushyant Singh from Shree Ram Centenial School, Indore

Subject :NSO Class : Class 6

Shanaya left for her office in her car. She drove 6 km towards North and then 12 km towards West. She then turned to the South and covered 1 km. Further, she turned to the East and moved 8 km. Finally, she turned right and drove 5 km. How far and in which direction is she now from her starting point?

A2 km, West
B4 km, East
C4 km, West
D2 km, North

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Ans 1:

princy gigo from Global Indian International School, Kuala Lumpur

Class : Class 8

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Dushyant Singh from Shree Ram Centenial School, Indore

Subject :NSO Class : Class 6

Find the minimum number of straight lines required to draw the given figure.

A15
B16
C14
D17

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Ans 1:

Medha Bijjaram from Prime Academy, Mumbai

Class : Class 9

Ans 2:

Dnyanada Selokar from Podar International School, Nagpur

Class : Class 6

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Dushyant Singh from Shree Ram Centenial School, Indore

Subject :NSO Class : Class 6

There is a certain relationship between figures (i) and (ii). Establish a similar relationship between figures (iii) and (iv) by selecting a suitable figure from the given options which will replace the (?) in figure (iv).

A
B
C
D

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