National Science Olympiad Forum By SOF Olympiad Trainer - Page 285
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SHASHWAT PANDEY from D A V PUUBLIC SCHOOL, NEW PANVEL
Subject :NSO    Class : Class 5

A ball of mass ‘m’ was dropped from height ‘h’ on 3 different planets X, Y and Z one at a time. The given graph shows the comparative account of time taken by the ball to reach the surface of these planets when dropped from the same height.Which of the following holds true regarding this?


AThe ball will weigh heaviest on planet X and lightest on planet Y.
BIt will be easier to lift a load on planet X as compared to planets Y and Z.
CThe layer of atmosphere is most likely to be absent on planet Y but present on planets X and Z.
DBoth A and C

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naman from dps noida noida, Noida
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C

Stone pebbles have spaces between them, which allow air and water to seep through and reach the roots. This will help the trees grow better.


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Saathvik Sriram from euroschool whitefield, Bangalore
Subject :NSO    Class : Class 4

Mohit wants to separate a mixture of sugar, water and pebbles. Which of these separation methods should he use to separate all the three components?

AFiltration, Evaporation
BDecantation, Sublimation
CFiltration, Decantation
DEvaporation, Distillation


none of the answers is correct.In option A,through filtration,we ca seprate pebbles.After that through Evaporation,we can get sugar,but wter will get evaporated.So,we willnot get water.So option A ,B,C,D are incorrect

Ans 1:

suhana priyadarsini nayak from VELS GLOBAL SCHOOL, Bengaluru
Class : Class 5
Sorry but for the explanation a and d are not correct because first we have to follow the filtration process to separate pebbles and then use evaporation process

Ans 2:

SWARIT JAIN from DPS Greater Noida, GREATER NOIDA
Class : Class 8
a and d are correct

Ans 3:

Ashwak from Cambridge, Jalandhar
Class : Class 8
Firstly , ( Sugar and Water ) and Pebbles can be separated through Filtration Secondly , Sugar and Water can be separated by Evaporation So , the answer is Option (A)

Ans 4:

Iniyan from Indian public school, Salem
Class : Class 4
A and d are correct

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Parth Gupta from Presidium Gurgaon, Gurgaon
Subject :NSO    Class : Class 6

Read the given statements and select the correct option.
Statement 1 : Rubber and plastic are used for covering electrical wires, plug tops and switches.
Statement 2 : Rubber and plastic are insulators.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DBoth statements 1 and 2 are false.


Statement 2 is the reason not explanation.

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

A


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Dhruv Sachdev from Bhavan Vidyalaya, chandigarh
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B
Citrus fruits are excellent sources of vitamin C. They can prevent diseases like scurvy and also help in curing common cold.


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Ashwak from Cambridge, Jalandhar
Subject :NSO    Class : Class 10

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Ashwak from Cambridge, Jalandhar
Subject :NSO    Class : Class 4

Ans 1:

Mohhika Sharma from Delhi Public School Greater Noida, Greater Noida
Class : Class 7

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C

The animal shown here is polar bear. They have a fat layer under skin and a layer of fur over it to protect them from cold.


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Somebody from Delhi Private School, Neverland
Subject :NSO    Class : Class 7

Ans 1:

Advika Behera from Sardar Patel Vidyalaya, New Delhi , New Delhi
Class : Class 5
why isn't the answer a that cutting wood can be a physical change (dead tree) and a chemical change ( all chemical reactions have stopped )

Ans 2:

Advika Behera from Sardar Patel Vidyalaya, New Delhi , New Delhi
Class : Class 5

Ans 3:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
The answer is Option C.. Because burning of candle is both physical and chemical change(melting of wax could be assumed as physical change and the burning of the thread can be assumed as chemical change.. Also, sublimation of wax also takes place and can be classified as physical change.)

Ans 4:

Dhruv Singh from VIBGYOR HIGH HORAMAVU, BANGALORE
Class : Class 8

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Shubham from Litera valley, Patna
Subject :NSO    Class : Class 7

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Sujal Anand from Delhi World Public School, Jamshedpur
Subject :NSO    Class : Class 8

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