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Nilanjana De from Delhi Public School North, Bengaluru
Subject :NSO    Class : Class 7

Read the following statements regarding waste-water treatment plant with one or two blanks. Select the option that correctly completes any two statements.
(i) ________ process allows settling of sand in the chambers.
(ii) The solid waste called _______settles down and lighter waste called ________ floats on the surface.
(iii) Secondary treatment involves use of_______.
(iv) ________ and ________ are used in tertiary treatment.

A (ii) sluge, scum; (iii) chemicals
B (iii) grit removal; (iv) chlorine, UV rays
C (ii) scum, sludge; (iii) bacteria
D (i) screening; (iv) aerobic, anaerobic bacteria


What is the answer for the fourth statement?

Ans 1:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 8
Sludge settles down while scum stays up

Ans 2:

Medha Bhutani from Christ Academy, Bengaluru
Class : Class 7
chlorine and UV rays are tertiary treatment

Ans 3:

UTKARSH SAWARN from AIR FORCE SCHAOOL AMBALA CANTT, AMBALA CANTT
Class : Class 8

Ans 4:

Anshuman D from MVM, Hyderabad
Class : Class 7
Sludge settles while scum floats .you are right

Ans 5:

UTKARSH SAWARN from AIR FORCE SCHAOOL AMBALA CANTT, AMBALA CANTT
Class : Class 8
SLUDGE IS THE SOLID WASTE

Ans 6:

Chaitanya L K from SKCHEC, bangalore
Class : Class 7
yeah...sludge settles and scum floats.

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SHREYAS ANANDHAN from Phoenix Greens International School, Hyderabad
Subject :NSO    Class : Class 5

Ans 1:

Amit kumar dash from Soon international school , BHUBANESWAR
Class : Class 5
D

Ans 2:

Fareeha siddiqua from Janki Devi public school , Mumbai
Class : Class 5
it is B got it correct

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BHIDE PAVANI SHARDUL from ABHINAV VIDYALAY ENGLISH MEDIUM PRIMARY SCHOOL, Pune
Subject :NSO    Class : Class 5

Ans 1:

Pankaj Rajput from RBK GLOBAL SCHOOL, THANE
Class : Class 3
fuck

Ans 2:

SHREYAS ANANDHAN from Phoenix Greens International School, Hyderabad
Class : Class 6
a.y

Ans 3:

G from rohtak, JALANDHAR
Class : Class 4
The correct answer is A because an adult frog breathes through both lungs and skin .

Ans 4:

sauradeep from j v m Shyamali , ranchi
Class : Class 5
NO

Ans 5:

from DAV, Amritsar
Class : Class 7

Ans 6:

Aryaveer And Shaurya Shinde from Goldcrest High Vashi, Navi Mumbai
Class : Class 5
Frogs breathe through gills when they are small and through lungs when adult.Then, how can frogs breathe through their skin and are "Y"

Ans 7:

Niveditha from New Horizon Public School, Bengaluru
Class : Class 6
A

Ans 8:

SHREYAS ANANDHAN from Phoenix Greens International School, Hyderabad
Class : Class 6
a.y

Ans 9:

Sohan Chelekar from Millennium National School, Pune
Class : Class 7
the correct answer is a

Ans 10:

from DAV, Amritsar
Class : Class 7
LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL

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Ridhi Goyal from DAV Public School, Ludhiana
Subject :NSO    Class : Class 9



Select the incorrect statement regarding this.

APlants require nitrogen mainly in the form of nitrate, which is exported from roots to shoots, reconverted to ammonium and assimilated as amino acid.
BRhizobia, cyanobacteria, nitrifying bacteria, symbiotic fungi, etc are used as biofertilizers.
CRhizobium bacteria produce N2 fixing root nodules in leguminous plants and thus help in replenishing nutrients in crop fields.
DMaterials of biological origin which are commonly used to maintain and improve soil fertility are green manures, biofertilizers and bioinsecticides.


Ans 1:

ARYAN AGRAWAL from NPS KORAMANGALA, BANALORE
Class : Class 8
B

Ans 2:

ARYAN AGRAWAL from NPS KORAMANGALA, BANALORE
Class : Class 8
D

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Faraz Khan from Rassaz International School, Mira Road, Thane
Subject :NSO    Class : Class 6

Ans 1:

Vanita Bajaj Gupta from arya vidya mandir, Mumbai
Class : Class 6

Ans 2:

Faraz Khan from Rassaz International School, Mira Road, Thane
Class : Class 6
answer should be A as to and fro motion of a swing is not periodic motion

Ans 3:

Matisha Kansal from Sacred Heart High School, Chd, Chandigarh
Class : Class 6
the answer would be C as the hands of the clock shows rotational and periodic motion whereas the table top shows only rotational motion

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Atharva Kumar Tiwari from DPS, Faridabad
Subject :NSO    Class : Class 4

Ans 1:

Annika from presidency, bangaluru
Class : Class 4

Ans 2:

ASHMI Narkar from Vibgyor High Airoli, Navi Mumbai
Class : Class 4
After Holi summer comes so it should be D;i.e.summer

Ans 3:

Ajay Ovhal from Podar International School, Latur
Class : Class 4
the correct answer is C.

Ans 4:

from ,
Class : Class 5

Ans 5: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is C.

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Yogita Jha from Sarvodaya Sr. Secondary School, Khanpur, Jhajjar
Subject :NSO    Class : Class 5

Ans 1:

SHREYAS ANANDHAN from Phoenix Greens International School, Hyderabad
Class : Class 6
b.50 minutes

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RAHUL S ROY from ST.XAVIERS HIGH SCHOOL,VAPI, VAPI,GUJARAT
Subject :NSO    Class : Class 7

Ans 1:

Sanjay Kumar from Vellammal Vidyashram, Chennai
Class : Class 7
ans: b

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Praveen kumar from GD DAV Public school Bhandarkola Deoghar, deoghar
Subject :NSO    Class : Class 7

Ans 1:

Sanjay Kumar from Vellammal Vidyashram, Chennai
Class : Class 7
ans:c

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Smeet Vesmawala from J H Ambani Saraswati Vidhyamandir, Surat
Subject :NSO    Class : Class 5

Ans 1:

rishi karthik from Bvm Global, chennai
Class : Class 5
D, as all are not magnetic

Ans 2:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 7

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