National Science Olympiad Forum By SOF Olympiad Trainer

Vedika from bal bharti public school, Delhi

Subject :NSO Class : Class 4

Read the given flow chart showing energy conversion and identify P - S.

	P	Q	R	S
A	Car	Solar cooker	Windmill	Radio
B	Fan	Nuclear power Plant	Car	Sleeping
C	Microwave	Radio	Climbing	Reading
D	Bulb	Grass	Hydroelectricity	Bomb

Can someone please explain hoe does Electrical energy changes to mechanical energy in Hydroelectricity?

Ans 1:

Divyamsh from The Sky World School, Panchkula

Class : Class 5

It should other way around as in hydroelectricity generation mechanical gets converted to electrical

Ans 2:

ARNAV BANSAL from Arwachin International School Pilkhuwa, PILKHUWA

Class : Class 6

Ans 3:

ARNAV BANSAL from Arwachin International School Pilkhuwa, PILKHUWA

Class : Class 6

Ans 4:

Devank Jain from HBK High School, Ahmedabad

Class : Class 4

can anyone explain how chemical energy related to grass

Ans 5:

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)

Post Your Answer

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.

View All Answers (1)

Ans 1:

Shreya Yegna Narayanan from psbb, chennai

Class : Class 6

Submit Your Answers

Post Your Answer

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.

View All Answers (2)

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

Submit Your Answers

Post Your Answer

Chanpartap from The British Co Ed High School , Patiala

Subject :NSO Class : Class 7

Match column I with column II and select the correct option form the given codes.

AP-(ii), Q-(iii), R-(v), S-(iv)
BP-(iii), Q-(v), R-(ii), S-(iv)
CP-(iii), Q-(i), R-(ii), S-(v)
DP-(ii), Q-(iii), R-(i), S-(v)

View All Answers (0)

Submit Your Answers

Post Your Answer

Spandan Pradeep Pathare from Takshila school , Ahmednagar

Subject :NSO Class : Class 7

A bird is seen standing safely on a high voltage transmission line. Which of the following is the reason?

AThe body of the bird has a high resistance.
BThe scaly feet of the bird is a good insulator.
CThere is no potential difference between the two feet.
DThe trapped air in the feathers of the bird acts as an electrical insulator.

View All Answers (0)

Submit Your Answers

Post Your Answer

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 ??

View All Answers (6)

Ans 1:

Ritabrata Das from OPJS, Angul

Class : Class 7

Ans 2:

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 3:

Vedant from DON BOSCO, CHENNAI

Class : Class 2

whats displacement

Ans 4:

Satvik Pattanaik from GreenwoodHigh, bangalore

Class : Class 6

Ans 5:

P A Reyyansh from Ann Mary School, Dehradun

Class : Class 10

this was ez...

Ans 6:

SKIyer from CNS, Mumbai

Class : Class 6

Submit Your Answers

Post Your Answer

Sujata Samal from Alchemy school, Surat

Subject :NSO Class : Class 9

Identify the Al³⁺ ion from the given structures.

A I
B II
C III
D IV

please answer this

View All Answers (0)

Submit Your Answers

Post Your Answer

Alisha from Delhi Public School , bopal, Ahemdabad

Subject :NSO Class : Class 3

Rahul is visiting his friend who is admitted in a hospital. On his way to the hospital, he gets confused about the route. He then studies the map. Which of these symbols (d, e, f or g) on map will help him in locating the hospital?

Ad
Be
Cf
Dg

This is sign of Red cross socity, not for medical, Pls update information

View All Answers (2)

Ans 1:

ANSHUL GAJJAR from PODAR INTERNATIONAL SCHOOL, AHMEDABAD

Class : Class 3

A

Ans 2:

malik safana khursheed from solace international school boonora pulwama, pulwama

Class : Class 3

a

Submit Your Answers

Post Your Answer

ishit from EUROSCHOOL THANE, THANE WEST

Subject :NSO Class : Class 4

Read the list of the animals given below and answer the following question.
Fox, Frog, Mouse, Elephant, Lizard, Duck, Camel, Crow, Pig, Parrot, Buffalo, Zebra
Which of the animals given in the list lay eggs?

A Frog, Lizard, Duck, Crow, Parrot
B Fox, Frog, Duck, Crow, Parrot
C Zebra, Elephant, Mouse, Parrot, Fox
D Camel, Mouse, Buffalo, Crow, Pig

View All Answers (4)

Ans 1:

Baibhab Mishra from City Pride, pune

Class : Class 4

A as Frog,Lizard,Duck,Crow and parrot lay eggs:- -Lizard is a reptile;it lays eggs -Duck,Crow and Parrot lay eggs;They are birds -Frog lays eggs;it is an amphibian

Ans 2:

Aarathy Sudhir Aarav Sudhir from Global Indian International School, Abu Dhabi

Class : Class 7

Isn't the answer wrong?

Ans 3:

Gurnoor from Chitkara International School, Chandigarh

Class : Class 4

my ans is a

Ans 4:

Apoorva Gaurav from DAV, Muzaffarpur

Class : Class 5

Option a is correct

Submit Your Answers

Post Your Answer

Ujjayan Pal from Don Bosco School, Agartala

Subject :NSO Class : Class 10

Fill in the blanks with most appropriate option.
Bio-gas is an excellent fuel as it contains up to 75% __(i)__ . It burns without smoke, leaves no residue like ash in wood. Its heating capacity is __(ii)__ . The slurry left behind is removed periodically and used as excellent manure, rich in __(iii)__and __(iv)__.

	(i)	(ii)	(iii)	(iv)
A	Methane	High	Nitrogen	Phosphorous
B	Nitrogen	Low	Methane	Phosphorous
C	Methane	Low	Nitrogen	Oxygen
D	Oxygen	High	Nitrogen	Phosphorous

User Forum

Ans 1:

Ans 2:

Ans 3:

Ans 4:

Ans 5:

Ans 1:

Ans 1:

Ans 2:

Ans 1:

Ans 2:

Ans 3:

Ans 4:

Ans 5:

Ans 6:

Ans 1:

Ans 2:

Ans 1:

Ans 2:

Ans 3:

Ans 4:

Related Links