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Abhineeth Maity from Bright Riders School, Abu Dhabi
Subject :NSO    Class : Class 9

Which of the following statements about the given experimental set-up is/are incorrect?

I. It is used to separate a mixture of two or more miscible liquids for which the difference in boiling points is more than 25 K.
II. It is used for the separation of different gases from air.
III. It is used to separate acetone and water from their mixture.
IV. It is based on the principle of repeated cooling and condensation of vapours by providing surface for the vapours.

A I only
B III and IV only
C I and II only
D I and III only


Ans 1:

Gokulakrishnan from Rosemary public school, Tirunelveli
Class : Class 9
3 and 1 only

Ans 2:

Bipasana from KV IIT Kanpur, Kanpur
Class : Class 9
Fractional distillation is used to separate liquids with less than 25 K difference in boiling points.

Ans 3:

Suvan Shee from Chirec public school, Hyderabad
Class : Class 9
yes it 1 and 3 only

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Aniket Hedde from Podar International School, Nanded
Subject :NSO    Class : Class 8

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is D

The electonic configuration of manganese (atomic number=25) is 1s2 2s2 2p6 3s2 3p6 3d5 4s2


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Neha Sharma from St Patricks, Bhatinda
Subject :NSO    Class : Class 4

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Arnav Raj Sharma from GEMS International School the ultra master mega, Gurgaon
Subject :NSO    Class : Class 6

Which of the following statements is correct ?
(i) The response of plant towards the Earth is called phototropism .
(ii) The ability of certain animals to blend with the surrounding, making them difficult to spot is called camouflage.
(iii) Whales and dolphins breathe in oxygen from water through gills.
(iv) Hibernation is an adaptation for escaping hot weather.

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


escaping hot weather is called aestivation . hibernation is escaping from cold weather .

Ans 1:

Ridit Mishra from Delhi Public School, Gurgaon
Class : Class 8
Yes none of the options are correct

Ans 2:

Iba khan from DPS GBN, Noida
Class : Class 6
none of the options are correct as the only correct statement mentioned here is (ii)

Ans 3:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 10
here , statement 1 , 3

Ans 4:

MInnal Senthil from Prakriya, Bangalore
Class : Class 5
not a because The response of plant towards the sun is called phototropism

Ans 5:

Daksh Kumar from GCIS, Bangalore
Class : Class 7
THE CORRECT ANSWER IS A

Ans 6:

Snigdha swaminath from Christ nagar higher secondary school , Trivandrum
Class : Class 7
The answer is wrong

Ans 7:

Ridit Mishra from Delhi Public School, Gurgaon
Class : Class 8
According to me Statement 2 is correct

Ans 8:

Goldilocks from Sharada Mandir School, Miramar, Panjim, Goa, Panjim Goa
Class : Class 8
none of the answers are correct

Ans 9:

Goldilocks from Sharada Mandir School, Miramar, Panjim, Goa, Panjim Goa
Class : Class 8
Okay manvi

Ans 10:

Ridit Mishra from Delhi Public School, Gurgaon
Class : Class 8
Option A is Wrong

Ans 11:

Shourya Ganesh from The Green Acres Academy, Mumbai
Class : Class 9
Statement 4 is wrong because hibernation is done to escape cold weather not hot , so SOF is wwwwwwwwwwrrrrrrrrrrrrrrrrrrrooooooooooooooonnnnnnnnnnnnnnnngggggggggggggggggggg

Ans 12:

Manvi Mundepi from Montfort School Roorkee, Roorkee
Class : Class 9
I WANT EXPLAINATION

Ans 13:

Medha Bijjaram from Prime Academy, Mumbai
Class : Class 9

Ans 14:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 10
here all the statements are wrong except 3rd statement

Ans 15:

Parshti Bajpai from Modern Public School, ALWAR
Class : Class 7
Hibernation is done in winters not summers so OPTION A IS CORRECTTTTTT

Ans 16:

Sanskar Jaiswal from Rungta Public School, Bhilai
Class : Class 9
bot

Ans 17:

Dipam from Podar International School, Aurangabad
Class : Class 8
YES The correct answer is (A).

Ans 18:

Vidwat Amal from Podar International School , Anand
Class : Class 8
statement 4 is wrong and none of the options is correct as response of plants towards earth is called geotropism

Ans 19:

Karthik from Euro, Bengaluru
Class : Class 7
sof is wwwwwwwwwwwwwwwwwwwrrrrrrrrrrrrrrrrrrrrrrrrrroooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooonnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnngggggggggggggggggggggggggggggggggggggggggggg

Ans 20:

KEERTHANA SHIBU from INDIAN SCHOOL GHOUBRA, Oman
Class : Class 7
sof wrong ans there should be option like:only ii is correct

Ans 21:

santosh katiyar from narayana vidhyalayam, Nagpur
Class : Class 7
THE CORRECT ANSWER IS (A)

Ans 22:

Aarya Singh from Indian School Ghubra, Muscat
Class : Class 3
none of the options are correct

Ans 23:

Shuvangi Das from Vivekananda mission school, haldia
Class : Class 9
option 4 if wrong. pls Chk soF other thn that all are correct .

Ans 24:

Ridit Mishra from Delhi Public School, Gurgaon
Class : Class 8

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VAIBHAV KALVAKOTA from THE LEXICON INTERNATIONAL SCHOOL WAGHOLI, PUNE
Subject :NSO    Class : Class 8

Ans 1:

VAIBHAV KALVAKOTA from THE LEXICON INTERNATIONAL SCHOOL WAGHOLI, PUNE
Class : Class 8

Ans 2:

Adhrit from CHSV, Chennai
Class : Class 8
It's not asking about which properties occur (which would be all of them), it's asking which are in use. And that's only 1, 2, and 3. So the options are wrong

Ans 3:

Hprakash09 from Billabong high Bhopal, Bhopal
Class : Class 7
The answer is correct, as when friction occurs, obviously, all of its properties will occur, even if not all of the properties are required. That's... how friction works.

Ans 4:

Anirudh from Kendriya Vidyalaya Kanjikode, Palakkad
Class : Class 8
All the properties friction are in use. Hence, the correct one option 'D'.

Ans 5:

Arnav Raj Sharma from GEMS International School the ultra master mega, Gurgaon
Class : Class 7
The Options Are wrong I guess because only (i),(ii)and(iii) are in use

Ans 6:

Student from School, City
Class : Class 8
The Options Are wrong because only 123 are in use.

Ans 7:

Student from School, City
Class : Class 8
The Options Are wrong because only 123 are in use.

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VAIBHAV KALVAKOTA from THE LEXICON INTERNATIONAL SCHOOL WAGHOLI, PUNE
Subject :NSO    Class : Class 8

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is C.


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shaurya chitriki from delhi public school north, bangalore
Subject :NSO    Class : Class 3

Ans 1:

Mohi from Vibgyor, Bangalore
Class : Class 6
B) 2 and 3

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Dheeraj from Sri Sri Ravishankar Vidya Mandir, Bangalore
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Mass is the amount of matter present in an object whereas weight is the force exerted by the gravity on that object.

Now, the weight of an object, W = g X m, where 'g' is Earth's gravitational constant and 'm' is the mass of the object.

The weight of the object will remain constant as long as the mass of that object is not changing since 'g' is constant. However, the weight of an object can still be changed without changing the mass. This can be explained by the following example: Consider a helicopter with a mass, 'm'.

1. If the helicopter is accelerated towards the earth (during landing) with an acceleration equals to 'A' (positive acceleration) then its weight would become, W = (g + A) X m,  and hence, the weight would increase.

2.  If the helicopter is accelerated away from the earth (during take-off) with an acceleration equals to '- A' (negative acceleration) then its weight would become, W = (g - A) X m,  and hence, the weight would decrease.


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Dheeraj from Sri Sri Ravishankar Vidya Mandir, Bangalore
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Mass is the amount of matter present in an object whereas weight is the force exerted by the gravity on that object.

Now, the weight of an object, W = g X m, where 'g' is Earth's gravitational constant and 'm' is the mass of the object.

The weight of the object will remain constant as long as the mass of that object is not changing since 'g' is constant. However, the weight of an object can still be changed without changing the mass. This can be explained by the following example: Consider a helicopter with a mass, 'm'.

1. If the helicopter is accelerated towards the earth (during landing) with an acceleration equals to 'A' (positive acceleration) then its weight would become, W = (g + A) X m,  and hence, the weight would increase.

2.  If the helicopter is accelerated away from the earth (during take-off) with an acceleration equals to '- A' (negative acceleration) then its weight would become, W = (g - A) X m,  and hence, the weight would decrease.


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ansh rai from delhi public school, Bhilai
Subject :NSO    Class : Class 5

Ans 1:

NAISHA JAJWARE from dps noida, noida
Class : Class 5
c

Ans 2:

Shreetej from Pearson public school, Pune
Class : Class 5
Its option (c), mechanical into kinetic

Ans 3:

Harsh Sobti from the samhita academy, BLR
Class : Class 5

Ans 4:

Ishani Gandhi from Lourdes convent school, Surat
Class : Class 6
In the options, it is written wrong because it is mechanical , kinetic energy. Instead of that it should be muscular, kinetic energy

Ans 5:

shreedhar from the shri ram school, delhi
Class : Class 5
mechanical,kinetic (c)

Ans 6:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5
mechanical into kinectic

Ans 7:

Pritisha priya from Global Indian International School, Abu Dhabi, Abu Dhabi
Class : Class 6
C.Mechanical, Kinetic

Ans 8:

Pratham Dave from GNS, Bangalore
Class : Class 7
Mechanical into kinetic energy.

Ans 9:

shaurya aggarwal from scholars rosary senior secondary school, rohtak
Class : Class 9
Mechanical,kinetic

Ans 10:

Saiprajna Panda from Kendriya Vidyalaya, Central University of rajasthan, Kishangarh
Class : Class 5
actually it is written wrong

Ans 11:

Tanvi from hh, delhi
Class : Class 5
Hey, anyone wants to explain to me why it is option C?

Ans 12:

RISHABH from SUMMER FIELD, GURGAON
Class : Class 5
c

Ans 13:

Biju Pappachan from Rkc , Raipur
Class : Class 1
Wanna explain why?

Ans 14:

Poulami Dan from Aditya Academi, Kolkata
Class : Class 5
c

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