National Science Olympiad Forum By SOF Olympiad Trainer - Page 417
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Aksh singh from The asian school, Dehradun
Subject :NSO    Class : Class 7

Read the given statements and select the correct option.
Statement 1: Forests prevent soil erosion.
Statement 2 : Canopy formed by crown of leaves of forest trees reduces the force and speed of raindrops.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Both statements 1 and 2 are false.


Ans 1:

Navyansh Garg from Saupin, Chandigarh
Class : Class 8

Ans 2:

medhamshu8 from sri chaitanya, hyderabad
Class : Class 8
statement 1:the roots of the trees of the forest hold the soil and prevent soil erosion. (true) statement 2:in forest the leaves of the trees overlap each other and form a canopy and when the rain falls on the leaves the leaves absorb the rain water and some water flows from the branches and remaining water fall on the small shrubs and it absorbs the water and the left over water is then absorbed by the soil so no floods will occur in the forests. (true) option B:statement 1 and statement 2 are true but statement 2 is not the correct explanation of statement 1

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aikya from psbn, bangalore
Subject :NSO    Class : Class 6

Ans 1:

Falguni from Navkis, Bangalore
Class : Class 7
Yeah,the answer is D

Ans 2:

Dheeraj Thriyambak M from Sri Sankara Senior Secondary School Adyar, Chennai
Class : Class 6
IV is burning of wood which is an irreversible change. How can it be D??

Ans 3:

Dheeraj Thriyambak M from Sri Sankara Senior Secondary School Adyar, Chennai
Class : Class 6
Option A states that I and IV are reversible changes????!!?!?!?!?

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Vedika from bal bharti public school, Delhi
Subject :NSO    Class : Class 4

Ans 1:

ARNAV BANSAL from Arwachin International School Pilkhuwa, PILKHUWA
Class : Class 5

Ans 2:

ARNAV BANSAL from Arwachin International School Pilkhuwa, PILKHUWA
Class : Class 5

Ans 3:

Baibhab Mishra from City Pride, pune
Class : Class 4
Hydroelectricity can be used in things like fans. Here , Electrical energy(Hydroelectricity)----->changes into----->Mechanical energy(fan)

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PARNIKA SINGH from GYAN GANGA EDUCATION ACADEMY, RAIPUR
Subject :NSO    Class : Class 6

Read the given statements and select the correct option.
Statement 1: Groundwater is generally safe for drinking.
Statement 2: Groundwater is free from suspended impurities.

A Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
C Statement 1 is correct but statement 2 is incorrect.
D Both statements 1 and 2 are incorrect.

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Aditya Sai Vemparala from Amanora school, Pune
Subject :NSO    Class : Class 7

Pain due to a wasp sting can be reduced by rubbing (i) solution while pain due to a bee sting can be neutralised by applying (ii) on the skin. Substance (iii) is used for making pickles and when it is mixed with (ii), it undergoes a (iv) change to evolve (v) gas.
(i), (ii), (iii), (iv) and (v) are respectively

A Formic acid, sodium carbonate, vinegar, chemical and CO2
B Vinegar, calamine solution, vinegar, chemical and CO2
C Soap, vinegar, sodium bicarbonate, physical and H2
D None of these.

Ans 1:

Saanvi from Dehli Public School , Gurugram
Class : Class 4

Ans 2:

Mrittika Roy from DPS Ruby Park, Kolkata
Class : Class 6
there are only 4 items in each option, but there are five blanks

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Chanpartap from The British Co Ed High School , Patiala
Subject :NSO    Class : Class 7

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Spandan Pradeep Pathare from Takshila school , Ahmednagar
Subject :NSO    Class : Class 7

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Falguni from Navkis, Bangalore
Subject :NSO    Class : Class 6

Read the given statements and select the correct option.
Statement 1 : The displacement of a body may be zero, though distance can be finite.
Statement 2 : If a body moves such that finally it arrives at initial point, then displacement is zero while distance is finite.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true and statement 2 is false.
D Statement 1 is false and statement 2 is true.


Can someone please explain it ??

Ans 1:

P A Reyyansh from Ann Mary School, Dehradun
Class : Class 10
this was ez...

Ans 2:

Vedant from DON BOSCO, CHENNAI
Class : Class 2
whats displacement

Ans 3:

SKIyer from CNS, Mumbai
Class : Class 6

Ans 4:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Vedant , Displacement is the shortest distance from the initial point and the final point of a moving body

Ans 5:

Ritabrata Das from OPJS, Angul
Class : Class 7

Ans 6:

Satvik Pattanaik from GreenwoodHigh, bangalore
Class : Class 6

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Sujata Samal from Alchemy school, Surat
Subject :NSO    Class : Class 9

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Alisha from Delhi Public School , bopal, Ahemdabad
Subject :NSO    Class : Class 3

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