National Science Olympiad Forum By SOF Olympiad Trainer

Devangi Chaudhuri from DPS Paradip Refinery, Paradeep

Subject :NSO Class : Class 6

Water pollution caused by drains could be avoided or reduced by ____.

ASpeedy disposal and proper treatment
BRegular servicing of vehicles and using clean fuels
CSewage treatment before disposal
DDischarging domestic waste into rivers.

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Ans 1:

Sucheta from Podar, Pune

Class : Class 8

the answer is c

Ans 2:

Kushal from Chirec, Hyderabad

Class : Class 7

the answer is c

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Devangi Chaudhuri from DPS Paradip Refinery, Paradeep

Subject :NSO Class : Class 6

Read the following statements carefully and select the correct option.
Statement 1: The poles of a magnet can never be separated.
Statement 2 : When a bar magnet is broken, each piece will have only one pole and its magnetism is enhanced.

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 and statement 2 is false.
DBoth statements 1 and 2 are false.

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Ans 1:

PRISHA SRIVASTAVA from DPS GV, Ghaziabad

Class : Class 8

d

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Vedant Sharma from Silver Oaks , Hyderabad

Subject :NSO Class : Class 6

Refer to the given figures and select the correct option regarding these, when they are operating.

AObject I converts mechanical energy into kinetic energy whereas object II converts electrical energy into potential energy.
BObject II converts electrical energy into kinetic, heat and sound energy.
CObject I converts potential energy into kinetic energy.
DBoth B and C

i f**k

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Ans 1:

Aarsh Kumar Singh from Kendriya Vidyalaya , Mumbai

Class : Class 6

Class:

Ans 2:

Deeptanshu Sarkar from Woodbine Gardenia School, Kanpur

Class : Class 6

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vivaan sethi from GD goenka public school, Delhi

Subject :NSO Class : Class 3

Sandhya made a musical instrument as shown in the figure using large wooden box, a broom handle and a length of string.
She tightened the string by pulling harder on the broom handle. What kind of sound will she hear now?

A A higher pitched note
B A louder note
C A lower pitched note
D None of these

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Ans 1:

Ananya from Chrysalis high school, Banglore

Class : Class 3

A

Ans 2:

Avneet Kaur from Satpaul Mittal School , Ludhiana

Class : Class 3

A

Ans 3:

Avneet Kaur from Satpaul Mittal School , Ludhiana

Class : Class 3

Ans 4:

Thaneesha from Radcliffe School, Kharghar

Class : Class 7

Ans 5:

Ivan Tyagi from Chirec International School , Hyderabad

Class : Class 8

A

Ans 6:

Avneet Kaur from Satpaul Mittal School , Ludhiana

Class : Class 3

Ans 7:

Arnav Karwa from Gurukul Olympiad School, Aurangabad

Class : Class 3

A

Ans 8:

SAMARPAN DAS from Notre Dame Academy, Salakati Kokrajhar

Class : Class 7

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Pradipta Roy from Doon International School, Balasore

Subject :NSO Class : Class 6

What conclusion can be drawn from the experiment?

AStirring increases solubility, solubility increases with decrease in temperature.
BStirring increases solubility, solubility increases with increase in temperature.
CStirring decreases solubility, solubility decreases with increase in temperature.
DStirring decreases solubility, solubility increases with decrease in temperature.

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Ans 1:

Kushal from Chirec, Hyderabad

Class : Class 7

i think the answer is b

Ans 2:

Manvi Mundepi from Montfort School Roorkee, Roorkee

Class : Class 9

correct answer is c because solubility increases when increase in temperature takes place

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Ashutosh Sundresh from Shiv nadar, Faridabad

Subject :NSO Class : Class 7

Bob is trying to turn rod P into a magnet by the following stroking method. He finds that this method does not work. Which two of the following could be the possible explanations?

(1) He should stroke rod P with the south-pole instead.
(2) The bar magnet is not touching rod P.
(3) The bar magnet stroke rod P in more than one direction.
(4) Rod P is not a magnetic material.

A1 and 2
B2 and 3
C2 and 4
D3 and 4

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Ans 1:

Basundhara Ghosh from Birla High School Mukundapur , Kolkata

Class : Class 7

Nope..it should be two and four

Ans 2:

Shayan Bari from Kendriya Vidyalaya, Katihar

Class : Class 7

It should be 2, 3 and 4 which is not given.

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Ashutosh Sundresh from Shiv nadar, Faridabad

Subject :NSO Class : Class 7

In the given apparatus, air is inhaled and exhaled through tube P. Tubes X and Y are closed subsequently at different times.

What will happen when
(i) Tube X is closed with a clip and air is exhaled ?
(ii) Tube Y is closed with a clip and air is inhaled ?

A
B
C
D

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Ans 1:

Ashmita Choudhury from Delhi Public School Noida, Noida

Class : Class 8

Please someone give the solution.

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aditya arora from Heritage Experiential Learning School, gurugram

Subject :NSO Class : Class 6

Refer to the given graph.

What can be the possible reason for the change in the population of mosquito larvae in the pond?
(i) There is a layer of oil over pond.
(ii) New fish are introduced into the pond.
(iii) There is a period of dry weather.
(iv) Many of the mosquito larvae have changed into mosquitoes.

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

answer is c

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aditya arora from Heritage Experiential Learning School, gurugram

Subject :NSO Class : Class 6

In which of the following cases, the frictional force between the tyres of a car and the road increases?

AWhen the road is wet.
BWhen the speed of the car increases.
CWhen the surface area of the tyres in contact with the road increases.
DWhen there are more passengers in the car.

answer is c as area in contact is more

View All Answers (4)

Ans 1:

Pradipta Roy from Doon International School, Balasore

Class : Class 10

Ans 2:

JOGN from asdaw, adawsda

Class : Class 6

Ans 3:

Omkar Deshmukh from phoenix greens international school, Hyderabad

Class : Class 7

Ans 4:

Toothless from PSBB LLA, Bangalore

Class : Class 6

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Niveideeta Cour from Suncity World School, Gurgaon

Subject :NSO Class : Class 5

Read the given statements regarding the lever and select the correct ones.
(i) In beam balance, fulcrum is in the middle.
(ii) A nutcracker is an example of third-class lever.
(iii) In tongs, the fulcrum and the load are at the two ends.
(iv) See-saw is an example of first class lever.

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

easy and simple if you have studied levers

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Ans 1:

Siba Prasad Kar from St. Francis De Sales , Guwahati

Class : Class 5

A

Ans 2:

Adhiraj Bhopne from Ryan International School kharghar , Navi mumbai

Class : Class 5

Ans 3:

Adhiraj Bhopne from Ryan International School kharghar , Navi mumbai

Class : Class 5

Ans 4:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore

Class : Class 9

Admin can you pls. explain why the answer is A? It should be C as nutcracker is NOT an example of third class lever.

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