National Science Olympiad Forum By SOF Olympiad Trainer

Bharat Aggarwal from Kalyani school, Pune1

Subject :NSO Class : Class 5

Without friction there would be

Aless machine efficiency.
Bgreater output work than input work.
Cgreater input work than output work.
Dequal input and output work.

explain this

Ans 1:

Sanjeev Garg from Assumption Convent School, malout

Class : Class 6

Ans 2:

Bhabani Prasad from Narayan School, Kolkata

Class : Class 6

Ans 3:

SHREYAS ANDOTRA from RYAN INTERNATIONAL SCHOOL, CHANDIGARH

Class : Class 8

Ans 4:

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi

Class : Class 7

Ans 5:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

Ans 6:

Ali Hussain from Delhi Private School Dubai, Dubai

Class : Class 6

explain

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Hemant Ayuj from Shanti Asiatic, Ahmedabad

Subject :NSO Class : Class 6

Study the given flowchart and identify the processes P, Q, R and S involved in the separation of the mixture.

                    P                             Q                         R                S
A Sublimation     Magnetic separation     Filtration        Evaporation
BMagnetic          Filtration separation     Sublimation     Evaporation
CEvaporation     Magnetic separation     Filtration          Sublimation
DSublimation     Magnetic separation     Evaporation     Filtration

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Hemant Ayuj from Shanti Asiatic, Ahmedabad

Subject :NSO Class : Class 6

In the given diagrams, compasses are used to plot the magnetic field around a bar magnet with poles marked N(North) and S(South). Which of the following diagrams correctly shows the expected field pattern?

A
B
C
D

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Ans 1:

S SAHITHYAA RAMAN from Padma Seshadri T Nagar, Chennai

Class : Class 7

Correct answer is d

Ans 2:

pinki kashyap from kids r kids, Chandigarh

Class : Class 7

its D as the force of attraction and repulsion(depicted by arrows)should be equal i.e if there are arrows of repulsion(going north either south)is 2 then there should be equally 2 arrows of attraction.

Ans 3:

Tushar from DPS, Bengaluru

Class : Class 9

Correct answer is option D.

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Hemant Ayuj from Shanti Asiatic, Ahmedabad

Subject :NSO Class : Class 6

Which picture shows the book B with the most potential energy?

A
B
C
D

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Ans 1:

SUVAMDEBNATH from KVS BAMANGACHI, Howrah

Class : Class 9

B

Ans 2:

Tushar from DPS, Bengaluru

Class : Class 9

Higher the height, higher the potential energy. Hence the correct option is B.

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bharat gawade from ,

Subject :NSO Class : Class 6

. Which of the following methods will be used for the separation of a mixture of common salt and ammonium chloride?

A Centrifugation
B Distillation
C Sublimation
D Crystallisation

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Ans 1:

Tushar from DPS, Bengaluru

Class : Class 9

Correct option is B.

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bharat gawade from ,

Subject :NSO Class : Class 6

Read the following statements and select the correct ones.
1. The process of making yarn from fibres is called as spinning.
2. Ginning is the process by which harvested cotton is dried and fiber are seprated from their seeds.
3. Jute is a biodegradable fibre and replenishes earth's nutrients.
4. Jute fibres are composed primarily of cellulose only.

A Only 1 and 2 are correct.
B Only 1,2 and 3 are correct.
C 1,2,3 and 4 are correct.
D None of these are correct

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Ans 1:

HARSHAL KUTE from cambridge school buldhana, Buldhana

Class : Class 6

Aren't jute plants biodegradable and replenishes earth's nutrient????

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bharat gawade from ,

Subject :NSO Class : Class 6

There is a mistake in the following classification.

Which of the following is placed incorrectly in the groups ?

A Wool
B Carbon
C Iron
D Silver.

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Ans 1:

Mahak from Sarvodya sr sec school, Jhajjar

Class : Class 6

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bharat gawade from ,

Subject :NSO Class : Class 6

Study the given conversation and select the correct option regarding W, X Y and Z.

A W and X are calcium and phosphorus.
B W and X are sodium and potassium.
C Y is folic acid and Z is copper.
D Y is iodine and Z is iron.

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bharat gawade from ,

Subject :NSO Class : Class 6

Read the given statements and select the correct option
Statement 1 : The rainwater in mountains flows away down the slopes, leaving very little water for the trees to absorb
Statement 2 : To conserve water, the leaves of the pine trees are needle-like to reduce the loss of water due to evaporation.

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 Both statements 1 and 2 are false

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Ans 1:

Ajit kumar from centre point, NAGPUR

Class : Class 4

Ans b As less water is absorbed by soil so there is scarcity of water. Leaves of pine trees are modified to spines as the surface area of needle like leaves is much less than normal leaves and less transpiration is done by them. In that way pine trees save water.

Ans 2:

ansh mehta from rajhans vidyalaya, Mumbai

Class : Class 7

I agree with you, sanajy, this adaptation is done in desert plants. In mountaineous plants its done for something else.

Ans 3:

sachinthite@rocketmail.com from Sinhghad Public School Korti, Pandharpur

Class : Class 4

ok dadaaaa

Ans 4:

SANAJY GOPAL BHARTARIYA from ST. FIDELIS COLLEGE, LUCKNOW

Class : Class 6

leaves of pine trees are needle like so that snow falls easily and do not collect on the leaves so i think the answer is wrong

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bharat gawade from ,

Subject :NSO Class : Class 6

Refer to the following conversation.

Select the correct option about the above conversation.

A Raghav and Priya made correct statements.
B Siddhartha cited the reason for Raghav's assertion.
C Only Priya made the correct statement.
D None of these

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Ans 1:

Mohinder singh from Sacred heart convent school, Ludhiana

Class : Class 7

Demonstrate the same with the help of a picture so as to have a better understanding of this question.

Ans 2:

Shreyas Gupta from CHIREC International, Hyderabad

Class : Class 8

ya bro

Ans 3:

ISHRAT SINGLA from D.A.V. PUBLIC SCHOOL, B.R.S. NAGAR, LUDHIANA., Ludhiana

Class : Class 9

Yes it should be done

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