National Science Olympiad Forum By SOF Olympiad Trainer - Page 106
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Aditya Rai from Kv No.1 Icchanath, Surat
Subject :NSO    Class : Class 4

Ans 1:

Aaradhya Jawalekar from Amanora school, Pune
Class : Class 4
The answer is D

Ans 2:

Aditya Rai from Kv No.1 Icchanath, Surat
Class : Class 6
Let's see who will give correct answer

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pranil mishra from KVS, bhubaneswar
Subject :NSO    Class : Class 6

Ans 1:

pranil mishra from KVS, bhubaneswar
Class : Class 8
ans is east

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Nila Pillai from Chennai public School, Chennai
Subject :NSO    Class : Class 6

"First day white, next day red, third day from my birth - I'm dead".
Read the above given lines about a fibre yielding plant and select the correct statements regarding this.
(i) The flowers of this plant are first green in colour and turn yellow after a few days.
(ii) Each flower falls after ten days, leaving behind a small seed pod known as the boll, which is red in colour.
(iii) The fibre obtained from this plant has many qualities that make it ideal for making clothes.
(iv) The fibres are the hair that grow on the surface of cotton seeds. Gradually, these fibres dry in the sun, turning fluffy and white as snow.

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


I

Ans 1:

Nila Pillai from Chennai public School, Chennai
Class : Class 6

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Reyansh Singla from St. Joseph's Convent School, Bathinda
Subject :NSO    Class : Class 9

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Pushkar Sonnekar from Ryan International School, Mumbai, Vasai East
Subject :NSO    Class : Class 8

Identify the methods of increasing and decreasing friction and choose the correct option.
(i) The tyres of vehicles have treads.
(ii) Gymnasts often apply a coarse material on their hands.
(iii) Saliva in our mouth helps us to swallow food.
(iv) A surgeon powders his hand before pulling on his plastic gloves

(i) (ii) (iii) (iv)
A Increasing Decreasing Increasing Decreasing
B Decreasing Increasing Decreasing Increasing
C Increasing Increasing Decreasing Decreasing
D Decreasing Decreasing Increasing Increasing


Can anybody explain in option C. why would a gymnast apply powder to their hands to increase the friction?

Ans 1:

KARTIK SHINDE from Delhi Public school Rau Indore , indore
Class : Class 4
c

Ans 2:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
Both statements are true. So, Option A is the correct answer. Kindly correct it, SOF.

Ans 3:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
SOF, WHEN ARE YOU GOING TO LISTEN TO THE DEMANDS OF THE STUDENTS WHO ATTEMPT YOUR TEST PAPERS ON A REGULAR BASIS?! FRICTION ALWAYS ACTS OPPOSITE TO THE DIRECTION OF MOTION. MOREOVER, THE FIRST STATEMENT IS ALSO CORRECT, SINCE THE GROUND WILL EXERT FRICTION OPPOSITE TO THE DIRECTION OF MOTION OF THE PERSON. SINCE BOTH STATEMENTS ARE CORRECT AND THE SECOND STATEMENT IS THE CORRECT EXPLANATION OF THE FIRST ONE, OPTION A IS THE CORRECT ANSWER. It is a humble request to PLEASE rectify these incessant errors in test papers.

Ans 4:

Aditya Mahajan from DPS Noida, noida
Class : Class 9
Either a) or b)Definitely not c) or d)

Ans 5:

Prathamesh from DPS bhilai, Bhilai
Class : Class 8

Ans 6:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
option a

Ans 7:

Ashvik Banerjee from Mount Litera Zee School , Vasco
Class : Class 9
c

Ans 8:

Aayushman mohapatra from Sental The Global School, Hyderabad
Class : Class 8
It is option a

Ans 9:

arnav raj sharma from DPS Vasant kunj, delhi
Class : Class 8
a

Ans 10:

Prathamesh from DPS bhilai, Bhilai
Class : Class 8

Ans 11:

Aayushman mohapatra from Sental The Global School, Hyderabad
Class : Class 8
Please correct it SOF olympiad trainer

Ans 12:

Divij Narang from ,
Class : Class 8
answer is a ,sof

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Siddharth from DPS, Jodhpur
Subject :NSO    Class : Class 7

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Aaradhya Jawalekar from Amanora school, Pune
Subject :NSO    Class : Class 4

Ans 1:

Aaradhya Jawalekar from Amanora school, Pune
Class : Class 4
D Rubber

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Saisuchit Thandra from Delhi Public School Nacharam, Hyderabad
Subject :NSO    Class : Class 3

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somesh from Centre point katol road, Nagpur
Subject :NSO    Class : Class 5

Ans 1:

Mukta Pundir from ,
Class : Class 5
It is actually c since pitcher plants need some nutrients not present in soil like phosphorus which they get from insects.

Ans 2:

Rajat Kumar Sahoo from KV Puri, Puri
Class : Class 6
d

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Surabhi from NPS , Bangalore
Subject :NSO    Class : Class 8

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