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

Ans 1:

savyasachi from montfort , roorkee
Class : Class 9

Ans 2:

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 3: (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 4:

Ojaswi from SAINT JOHNS CONVENT SCHOOL LANSDOWNE, DELHI
Class : Class 9

Ans 5:

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

Ans 6:

IAMLOST from ABC, Pune
Class : Class 8

Ans 7:

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 8:

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

Ans 9:

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

Ans 10:

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).

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4: (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 5:

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

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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.


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

Ans 1:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 9
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.

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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 8:

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

Ans 9:

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 10:

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

Ans 11:

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 12:

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

Ans 13:

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

Ans 14:

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

Ans 15:

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

Ans 16:

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 17:

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 18:

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

Ans 19:

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

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

Ans 1:

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

Ans 2:

Aditri Dixit from TCIS, Bangalore
Class : Class 3

Ans 3:

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

Ans 4:

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

Ans 5:

kalra Shaleen from Jalandhar, Jalandhar
Class : Class 5
b

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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

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

Ans 1:

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

Ans 2:

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

Ans 3: (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 4:

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

Ans 5:

Ashwak from Cambridge, Jalandhar
Class : Class 8
A

Ans 6:

Ashwak from Cambridge, Jalandhar
Class : Class 8
A

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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: (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 2:

Student from School, City
Class : Class 5
How can a liquid be equal to a battery and another liquid be equal to *its* cell?

Ans 3:

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

Ans 4:

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

Ans 5:

Prabhav Kaushik from DPS Noida, Noida
Class : Class 8

Ans 6:

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

Ans 7:

Student from School, City
Class : Class 5
How can a liquid be equal to a battery and another liquid be equal to *its* cell?

Ans 8:

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

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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


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Shiven Dinkar from DPS NOIDA Sector 30, Delhi
Subject :NSO    Class : Class 3

Ans 1:

Aayman from DPS NOIDA, Noida
Class : Class 4
Well shiven

Ans 2:

Aathrei MS Damodaran from Chrysalis High, Bengaluru
Class : Class 6
Drying is the answer !

Ans 3:

Aayman Aamir from DPS NOIDA, Noida
Class : Class 3
Drying is the answer From aayman

Ans 4:

Havi Jain from GEMS modern academy, Gurgaon
Class : Class 8
the answer of this question is drawing because when we dry something moisture is removed from it.

Ans 5:

Shiven Dinkar from DPS NOIDA Sector 30, Delhi
Class : Class 4
aayman please can you come online

Ans 6:

Abhinha Ajay Ovhal from Podar International School, Latur
Class : Class 6
drying

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

To every action there is always an equal and opposite reaction. Which of the following statements is correct regarding this?

A The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless.
B The horse pulls the buggy forward slightly harder than the buggy pulls the horse backward, so they move forward.
C The horse can pull the buggy forward only if the horse weighs more than the buggy.
D None of these


Does anybody know the solution?

Ans 1:

Venya from CHIREC International, Hyderabad
Class : Class 9

Ans 2:

Rishit from Allen, Bangalore
Class : Class 8
it is one

Ans 3:

TARUN from DAV, DHANBAD
Class : Class 8
Ans.- (A) The buggy pulls the horse as backward just as hard the horse pulls the buggy forward. According to the IIIrd law of NLM( Newton's Laws of Motion), the action and reaction force takes place in two different bodies, in different direction , but of the same magnitude.

Ans 4:

Anoushka Anbu from Amara Jyoti Public School, Bengaluru
Class : Class 8

Ans 5: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is A.

The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless. 


Ans 6:

ishaan parikh from ahmedabad international school, ahmedabad
Class : Class 8
Answer A will be correct if you take newtons third law of motion into consideration

Ans 7:

ishaan parikh from ahmedabad international school, ahmedabad
Class : Class 8

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