National Science Olympiad Forum By SOF Olympiad Trainer - Page 278
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Chatresh ramasai gudi from Bgsnps , Bangalore
Subject :NSO    Class : Class 8

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Aarav Gupta from Cambridge International School, Jalandhar
Subject :NSO    Class : Class 6

Rohan wanted to test the strength of four magnets. He used each magnet to attract a paperclip from a distance. For each magnet, he increased the distance between the magnet and the paperclip until the magnet could no longer attract the paperclip. He then recorded his findings in a table.


Arrange the magnets from the strongest to the weakest.

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


b

Ans 1:

SUSHEELA KAMLENDRA from FLORENCE ACADEMY, BENGALURU
Class : Class 6

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B

Stronger the magnet, wider would be the spread of its magnetic field, so it would attract objects from larger distance.Hence, the correct order for the magnets from strongest  to weakest magnetic field is given in option B.


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Snigdha swaminath from Christ nagar higher secondary school , Trivandrum
Subject :NSO    Class : Class 6

Which of the following statements are incorrect?
(i) Every periodic motion is an oscillatory motion.
(ii) Motion of strings of a guitar shows oscillatory as well as vibratory motion.
(iii) In circular motion, the acceleration of the particle is zero.
(iv) Inertia is the property of a body by virtue of which it resists any change in its state of rest or of motion.
(v) Aluminium foils can never be used as connecting wires whatever the circuit is.

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

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

D

A periodic motion may or may not be oscillatory .For example , motion of earth about sun is periodic but not oscillatory.

During circular motion of an object , its direction of motion changes with time and hence the velocity.So,the acceleration of the object is non zero. 

Aluminium is a good conductor of electricity .Hence, statement v is wrong.

 


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Mohammed Najl from Credence high school Dubai, Dubai
Subject :NSO    Class : Class 5

Ritu took two bimetallic strips, I and II (of equal size, length and breadth) made up of metals P and Q; and Q and R, respectively as shown in the figure. She subjected each bimetallic strip to heating for the same time period. The given diagram shows her experiment.

Which of the following can be inferred from the given experiment?

AMetal Q expands more as compared to metals P and R on heating for the same time period.
BMetal R contracts more as compared to metals P and Q on heating for the same time period.
CThe order of expansion of these metals when subjected to heating is R < Q < P.
DBoth B and C


B says contracts more, so D is correct.

Ans 1:

Amal Amzath Ali from jss international school, dubai
Class : Class 7
* SOLUTION

Ans 2:

Amal Amzath Ali from jss international school, dubai
Class : Class 7
option C is correct. For explanation see explanation

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Arav Jain from Global edge school, Hyderabad
Subject :NSO    Class : Class 7

Ans 1:

Arav Vilas Musale from Narayana e-techno school, Nanded
Class : Class 7
the answer should be option d as discs 1 and 2 are not covered and 3 and 4 are covered

Ans 2:

Maanasa from Billabong high, Chennai
Class : Class 7
Yes

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Dishen Mittal from The Gurukul Sector 20, Panchkula
Subject :NSO    Class : Class 4

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Dishen Mittal from The Gurukul Sector 20, Panchkula
Subject :NSO    Class : Class 4

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from dps north kolkata, Kolkata
Subject :NSO    Class : Class 7

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vishnu raghav from christ academy, bengaluru
Subject :NSO    Class : Class 5

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R SANKARSHNAN from NPS, BANGALORE
Subject :NSO    Class : Class 3

Ans 1:

Haarish from Amrita, Puducherry
Class : Class 4

Ans 2:

Anagh Agrawal from Billabong high, JABALPUR
Class : Class 3

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