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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:

Class : Class 8
SLUDGE IS THE SOLID WASTE

Ans 2:

Class : Class 7
yeah...sludge settles and scum floats.

Ans 3:

Class : Class 8

Ans 4:

Class : Class 7
chlorine and UV rays are tertiary treatment

Ans 5:

Class : Class 7
Sludge settles while scum floats .you are right

Ans 6:

Class : Class 8
Sludge settles down while scum stays up

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
D

Ans 2:

Class : Class 5
it is B got it correct

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 7
LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL

Ans 2:

Class : Class 3
fuck

Ans 3:

Class : Class 4
The correct answer is A because an adult frog breathes through both lungs and skin .

Ans 4:

Class : Class 6
A

Ans 5:

Class : Class 7
the correct answer is a

Ans 6:

Class : Class 5
NO

Ans 7:

Class : Class 6
a.y

Ans 8:

Class : Class 7

Ans 9:

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 10:

Class : Class 6
a.y

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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:

Class : Class 8
D

Ans 2:

Class : Class 8
B

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Subject :NSO    Class : Class 6

Ans 1:

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

Ans 2:

Class : Class 6
answer should be A as to and fro motion of a swing is not periodic motion

Ans 3:

Class : Class 6

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

Ans 2: (Master Answer)

Class : Class 1
The correct answer is C.

Ans 3:

Class : Class 4
the correct answer is C.

Ans 4:

Class : Class 4
After Holi summer comes so it should be D;i.e.summer

Ans 5:

Class : Class 5

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
b.50 minutes

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
ans: b

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
ans:c

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
D, as all are not magnetic

Ans 2:

Class : Class 7

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