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Gokulakrishnan from Rosemary public school, Tirunelveli
Subject :NSO    Class : Class 9

Ans 1:

Advait talnikar from Dhruv Global School, Sangamner
Class : Class 6
Ans. is A sublimation

Ans 2:

Saanvi Rao from Shree Krishna International School, Vapi
Class : Class 9
Sublimation because it is the process of change of state of matter from solid to gas without changing into liquid state.

Ans 3:

Gokulakrishnan from Rosemary public school, Tirunelveli
Class : Class 9
The answer is A.sublimation

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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:

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

Ans 2:

Gokulakrishnan from Rosemary public school, Tirunelveli
Class : Class 9
3 and 1 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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Ayush Anand Sharma from GEMS international school , 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:

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

Ans 2:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 7
here , statement 1 , 3

Ans 3:

Vidwat Amal from Podar International School , Anand
Class : Class 7
statement 4 is wrong and none of the options is correct as response of plants towards earth is called geotropism

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

Medha Bijjaram from Prime Academy, Mumbai
Class : Class 6

Ans 8:

Goldilocks from Sharada Mandir School , Panjim
Class : Class 7
none of the answers are correct

Ans 9:

Manvi Mundepi from Montfort School Roorkee, Roorkee
Class : Class 8
I WANT EXPLAINATION

Ans 10:

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

Ans 11:

Shuvangi Das from Vivekananda mission school, haldia
Class : Class 7
option 4 if wrong. pls Chk soF other thn that all are correct .

Ans 12:

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

Ans 13:

Shourya Ganesh from The Green Acres Academy, Mumbai
Class : Class 6
Statement 4 is wrong because hibernation is done to escape cold weather not hot , so SOF is wwwwwwwwwwrrrrrrrrrrrrrrrrrrrooooooooooooooonnnnnnnnnnnnnnnngggggggggggggggggggg

Ans 14:

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

Ans 15:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 7
here all the statements are wrong except 3rd statement

Ans 16:

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

Ans 17:

Goldilocks from Sharada Mandir School , Panjim
Class : Class 7
Okay manvi

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

Ans 1:

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

Ans 2:

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

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:

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

Ans 5:

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

Ans 6:

Ayush Anand Sharma from GEMS international school , Gurgaon
Class : Class 8
The Options Are wrong I guess because only (i),(ii)and(iii) 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 1
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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