National Science Olympiad Forum By SOF Olympiad Trainer - Page 542
  1. Home
  2. /  Forum

User Forum

Ask Your Question
Anshuman Mishra from kv no 3, Bhubaneswar
Subject :NSO    Class : Class 6

Four rods of equal length and thickness but of different materials are coated with wax in the same manner. They are fixed to a trough containing hot water. The given diagram illustrates what happens to the wax on each rod after five minutes.

What can you conclude from the given diagram?
(i) The aluminium rod conducts heat better than the brass rod.
(ii) The aluminium rod conducts heat better than the copper rod.
(iii) The glass rod conducts heat better than the copper rod.
(iv) The wax on the copper rod melts faster than the wax on the brass rod.

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


Ans 1:

ADVAY BANSAL from LOTUS VALLEY INTERNATIONAL SCHOOL GURUGRAM, GURUGRAM
Class : Class 6
what is this man do something

Ans 2:

Manvi Mundepi from Montfort School Roorkee, Roorkee
Class : Class 9
ACCORDING TO ME THE CORRECT ANSWER IS B , FIRST WE HAVE TO UNDERSTAND THE PICTURE AND THEN ANSWER

Ans 3:

Ashee Srivastava from APEEJAY SCHOOL NOIDA , NOIDA
Class : Class 7
The answer is 'a' because the rods are fully coated with wax, those rods which have less wax are good conductors because the wax melted and fell from it.

Ans 4:

BHAVYA JHA from GLOBAL CITY INTERNATIONAL SCHOOL, BANGALORE
Class : Class 6
I too agree with you .It's B and not A

Ans 5:

Vivaan Kohli from Greenwood High International School, Bangalore
Class : Class 6

Ans 6:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
b is the answer

Ans 7:

Eashta Khodke from Elpro International School Chinchwad Pune, Pune
Class : Class 8
OK

Ans 8:

A S Neeraj from K V 2, Chennai
Class : Class 6

Ans 9:

DEVAANGANA SARDAR from G.D. Birla Centre for Education, Kolkata
Class : Class 7
dddddddddddddddddddddddd

Ans 10:

Dheeraj Thriyambak M from Sri Sankara Senior Secondary School Adyar, Chennai
Class : Class 6
Sorry for giving the wrong information. At the beginning even I thought the answer was B.If you click the solution button, it says that since the copper rod has the least amount of wax on it, it is the better conductor as all the other wax on it has melted and fell down. That is why the answer is A not B

Ans 11:

Saatwik Padhy from TREE HOUSE HIGH SCHOOL, VIRAR
Class : Class 7

Ans 12:

Aarathy Sudhir Aarav Sudhir from Global Indian International School, Abu Dhabi
Class : Class 6

Ans 13:

Arkaprabho Sau from Griffins International School, Kharagpur
Class : Class 9
It must be 'B' not 'A'

Ans 14:

Taanvi from , Bangalore
Class : Class 9

Ans 15:

Dheeraj Thriyambak M from Sri Sankara Senior Secondary School Adyar, Chennai
Class : Class 6
it cannot be as you have said because the wax is dripping from the glass rod whereas on the copper rod, it is as it was first placed. And they will not give us a diagram if they are going to ask something not related to it.So, the answer must be B and not A.

Ans 16:

ankit from gg, guraon
Class : Class 6
ANSWER SHOULD BE C BECAUSE FIRRST IS CORRECT BUT METALS ARE GOOD CONDUCTERS OF HEAT

Ans 17:

gayathri from NPS, Bengaluru
Class : Class 3
the wax has been applied all over the rod. copper has the least amount of wax on it. So it is the best conductor of heat whereas the glass rod has the most amount of wax thus it is the weakest conductor of heat.Thus,the option "A" is the correct answer

Ans 18:

Ayan Vohra from Bhavan Vidyalaya , Chandigarh, chandigarh
Class : Class 7
why is everyone talking about wax and copper it is a question about statements and conductivity like bruh what

Ans 19:

R SANKARSHNAN from NPS, BANGALORE
Class : Class 8
It is A

Post Your Answer

from ,
Subject :NSO    Class : Class 1

Post Your Answer

vanshaj shah from tapti valley international school , surat
Subject :NSO    Class : Class 8

Ans 1:

Adhrit from CHSV, Chennai
Class : Class 8
Won't moving the slinky up and down produce the same result? You can check b observing from the side.

Ans 2:

Mahadevan from KV Rubber Board Kottayam, Kottayam
Class : Class 9

Ans 3:

Sriram Venkatkrishnan from Basava International School, New Delhi
Class : Class 7

Ans 4:

savyasachi from montfort , roorkee
Class : Class 9

Ans 5: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is D

In transverse wave, vibration of a wave is perpendicular to its direction of propagation of wave.


Ans 6:

Mani Gupta from Carmel Convent School, Faridabad
Class : Class 9
The correct answer is D. In a transverse wave the direction of the movement of the particle is perpendicular to direction of motion of the wave. So, over here, when we move the end Q from left and right , it will produce a transverse wave,. You can check it by observing it from the top.

Ans 7:

Ayush Gorain from Sarala Birla Public School, Ranchi
Class : Class 8
In my opinion, the answer should be both option (C) and option (D). Transverse waves are waves in which the motion of particles are perpendicular to the motion of the wave (for example, light). Moving the slinky at an angle of 45 degrees to the table would create a wave, just not a perpendicular one, and thus not a transverse wave. This excludes option (A). Option (B) is also excluded, as it creates a longitudinal wave (motion of the particles is parallel to the motion of the wave). Option (C) involves the wave being moved up and down (assumed to be at right angles, since it is not mentioned). The slinky thus also moves up and down, and creates a transversal wave (as the motion of the wave is from Q to P, and the motion of the parts of the slinky is perpendicular to line QP). Option (C) is thus correct. Option (D) involves the wave being moved left to right (assumed to be at right angles, since it is not mentioned). This also created a transverse wave (as the motion of the parts of the slinky is perpendicular to the motion of the wave from Q to P). Option (D) is thus, also correct. Since we live in a three dimensional world, and it is not mentioned in the question that the experiment is performed in a 2 dimensional world, we can assume that the experiment is done in a 3D world. Due to the presence of length, breadth and height, the slinky can be moved in two ways perpendicular to line QP (i.e. the slinky). Given that both ways this can be done are mentioned in the question, both options must be correct. Therefore, I opine that the correct answer is both option (C) and option (D).

Ans 8:

Ojaswi from SAINT JOHNS CONVENT SCHOOL LANSDOWNE, DELHI
Class : Class 6

Ans 9:

IAMLOST from ABC, Pune
Class : Class 8

Ans 10:

Rishith Sunil from BVM Global BHS, Chennai
Class : Class 8

Post Your Answer

Sainavaneet from Global Indian , Bangalore
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is A.

Sugar syrup is neutral and hence the colour of blue litmus and red litmus remains unchanged. Tamarind juice is acidic, so blue litmus turns red but red litmus does not change its colour. Lime water and soap solution are basic in nature which turn red litmus blue whereas blue litmus remains unchanged.


Ans 2:

YASH SAH from DELHI PUBLIC SCHOOL MIS DOHA, Doha
Class : Class 8

Ans 3:

Aryan Ghatti from Mount saint mary school , Delhi
Class : Class 8

Ans 4:

CHIRAG SHAH from Lilavati Poddar , Mumbai
Class : Class 9
yeah the answer is a

Ans 5:

Mayank Mili from Delhi Public School, Golaghat
Class : Class 9
Answer is A

Post Your Answer

Lokesh Chhabra from Lilavatibai podar high school, Mumbai
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Fish Y will be least affected as it is camouflaging with the sea weeds. Fish Y can easily escape from the predator by blending with the surrounding environment.


Post Your Answer

VV Souri from LITTLE FLOWER SCHOOL , UPPAL HYDERABAD
Subject :NSO    Class : Class 7

Ans 1:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
Also freezing and melting point of water is 0 degrees celsius

Ans 2:

Sanidhya Kapoor from Shikshantar, Gurugram
Class : Class 8
It is cooling towards room temperature so it does not solidify since the freezing point is below room temperature.

Ans 3:

Pisal Dhruv from Veer Bhagat Singh International School, Mumbai
Class : Class 7
i think b is the correct answer

Ans 4:

Bhumi Chheda from SVKM J V Parekh International School, Mumbai
Class : Class 9
i think b is correct

Ans 5:

Mohinder singh from Sacred heart convent school, Ludhiana
Class : Class 7
B is the correct answer

Ans 6:

Debarka Das Gupta from Silchar Don Bosco School, Silchar
Class : Class 7
i think b is the correct answer

Ans 7:

Ashwak from Cambridge, Jalandhar
Class : Class 8
B should be the correct answer I think

Ans 8:

Hritvi from Podar International School, Mumbai
Class : Class 7
There is no proper solution for this question which will make it more confusing as everyone will have different opinions in this question.

Ans 9:

JANYA CHANGELA from UDGAM SCHOOL FOR CHILDREN , Ahmedabad
Class : Class 8
I THINK THAT B IS ONLY THE CORRECT ANSWER

Ans 10:

Ronav Kerkar from Jamnabai Narsee School, Mumbai
Class : Class 7
either b or d

Ans 11:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
It cools towards room temperature so it does not freeze

Ans 12:

kashvi from Amity, noida
Class : Class 7
Three states - gas , liquid & solid When hot water temp is going down it will be ultimate become solid ie ice But before becoming ice temp will stagnant for some time where in both states liquid & solid co-exist==> some part of liquid is in ice form. X is the same state where in solid and liquid will co-exist. Hence option 4 is correct(solidification& evaporation) Note: Could not attach gif .It would have made it more clear.

Ans 13:

Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee
Class : Class 10
why?

Ans 14:

Anish from Vibgyor, Pune
Class : Class 8
I think b is correct because there is no solidification

Ans 15:

pankaj srivastava from K R mangalam world school, vaishali
Class : Class 6
b is the correct answer

Ans 16:

Hritvi from Podar International School, Mumbai
Class : Class 7
I think B is the correct answer because there is no solidification taking place or else the water would have turned into ice. plus no solidification can take place when water is at room temperature.

Ans 17:

Himanish Basu from Army Public School Kamaraj Road, Bangalore
Class : Class 7

Ans 18:

arjun from the bishops school camp , pune
Class : Class 8
at 4 degree celsius water starts expanding and 'x' shows the same the room temperature might have been near or equal to the freezing point of water(eg room temperature of regions like arctic and antarctic)

Ans 19:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 10
i think there is no option correct in this ques. no evaporation and boiling is taking place as it is cooling down towards the room temperature. also no condensation is taking place as in the ques it is written a HOT liquid is being transferred to a beaker. as well as solidification may also not take place because room temp is above 0 degree centigrate. SOF PLEASE SEE TO IT THAT THIS TYPE OF WRONGG QUESTIONS AND SOLUTIONS ARE NOT POSTED.

Post Your Answer

AHANA BAG from DELHI PUBLIC SCHOOL JOKA SOUTH KOLKATA, KOLKATA
Subject :NSO    Class : Class 3

Ans 1:

kalra Shaleen from Jalandhar, Jalandhar
Class : Class 5
b

Ans 2:

Yaashi Pandey from Vibgyor High, Bengaluru
Class : Class 4
3

Ans 3:

Aditri Dixit from TCIS, Bangalore
Class : Class 3

Ans 4:

suhas from vibgyor, bangalore
Class : Class 4
The answer is gibbous moon.

Ans 5:

Nirvi Pal from jasudben ML School, mumbai
Class : Class 5
okkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk

Ans 6:

Yaashi Pandey from Vibgyor High, Bengaluru
Class : Class 4
3 Class

Ans 7:

Yaashi Pandey from Vibgyor High, Bengaluru
Class : Class 4
Gibbons moom

Ans 8:

AHANA BAG from DELHI PUBLIC SCHOOL JOKA SOUTH KOLKATA, KOLKATA
Class : Class 9

Ans 9:

Yaashi Pandey from Vibgyor High, Bengaluru
Class : Class 4
Ug

Post Your Answer

Swarnava Pal from Vivekananda Mission School, Haldia
Subject :NSO    Class : Class 4

Ans 1:

Ashwak from Cambridge, Jalandhar
Class : Class 8
A

Ans 2:

Ashwak from Cambridge, Jalandhar
Class : Class 8
A

Ans 3:

ANAY GUPTA from CMS KANPUR ROAD LUCKNOW, LUCKNOW
Class : Class 8
a is right

Ans 4:

Laiba from Olive International School , Doha
Class : Class 4
Yes. A.

Ans 5: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is A.

Both plants ‘c’ and ‘d’ bear fruits. This means they are flowering plants as only flowers change into fruits. Plant ‘c’ grows in water i.e., it is an aquatic plant but plant ‘d’ does not grow in water thus, it is a nonaquatic plant. Hence 'W' and 'X' represent plant ‘c’ and ‘d’ respectively.


Ans 6:

Aaryaman Pradhan from De paul School , Berhampur
Class : Class 5
a

Post Your Answer

Dhruvan G from Indian School al Ghubra, Muscat
Subject :NSO    Class : Class 8

There are two different solutions in set up P and Q as shown in figure. The bulb in the set up P glows more brightly as compared to that of the set up Q. What are the possible causes for this?

(i) The connections of the circuit Q may be loose.
(ii) The liquid in Q may have small conductivity.
(iii) Liquid in P is equivalent to a battery while liquid in Q is equivalent to a cell of the battery of liquid P.

A Only (i) and (ii)
B Only (ii) and (iii)
C Only (i)
D Only (ii)


I don't understand (iii)

Ans 1:

Student from School, City
Class : Class 8
How can a liquid be equal to a battery and another liquid be equal to *its* cell?

Ans 2:

Ankit kumar Jha from Ryan International School , Ghaziabad
Class : Class 9
but how do we know that the circuit is conneced tightly???

Ans 3:

Student from School, City
Class : Class 8
How can a liquid be equal to a battery and another liquid be equal to *its* cell?

Ans 4:

Ayush Chauhan from Modern Public School, Bhiwadi
Class : Class 9

Ans 5: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is B

In given figures, both the circuits are tightly connected and both the liquids conduct electricity because both the bulbs are glowing. The bulb in the set up P glows more brightly as compared to that of the set up Q might be because of any of the two possibilities:

1. The liquid in Q may have small conductivity. 

2.  Liquid in P is equivalent to a battery while liquid in Q is equivalent to a cell of the battery of liquid P. 


Ans 6:

Prabhav Kaushik from DPS Noida, Noida
Class : Class 8

Ans 7:

Akshara from NPS, Bengaluru
Class : Class 8
Yes.. Tightness is not mentioned.

Ans 8:

Chatresh ramasai gudi from Bgsnps , Bangalore
Class : Class 8
It’s not mentioned about tightness of the circuits.

Post Your Answer

Prakrit Kumar from Ryan international school, Maharashtra
Subject :NSO    Class : Class 4
Hi

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Plaese mention your query


Post Your Answer