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Subject :NSO    Class : Class 10

Ans 1: (Master Answer)

Class : Class 1
The correct answer is D.

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 7
The answer should be opt.B

Ans 2:

Class : Class 6
All metal expands on heating. Here metal Y expands more which leads to curling of both X and Y. B is the correct option.

Ans 3:

Class : Class 6
b

Ans 4:

Class : Class 5

Ans 5:

Class : Class 7
B

Ans 6:

Class : Class 6
as if we will contract metal x so it is not neccessery that y will contract if we contract metal y x has to be conyracted with it ans should be a

Ans 7:

Class : Class 5

Ans 8:

Class : Class 5
C is the correct answer

Ans 9:

Class : Class 5
b as Y expands more

Ans 10:

Class : Class 5

Ans 11:

Class : Class 5
cONFUSED IN d AND B

Ans 12:

Class : Class 5
Sumit Singhal , this is a bimetallic metal . Here , the two metals cannot go away from each other . So here , if y expands than x will also expand , and if x expands than y will also expand . I am getting confusion between A and B .

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Subject :NSO    Class : Class 8

The diagram shows a beaker containing a solution of zinc sulphate and two carbon electrodes. A battery is placed next to it. In order that the electrode P be plated with zinc,


A P must be connected to S and Q to R
B P must be connected to Q and S to R
C P must be connected to R and Q to S
D P and Q must be connected to R.


The answer would be a as znso4 wold breakdown into zn 2and so42-ions .the zn 2 would be attracted towards cathode(negative terminal) so p would be attached to negative terminal and therefore the answer is a.

Ans 1:

Class : Class 9
the answer is wrong.....it should be a

Ans 2:

Class : Class 9
In reactivity series hydrogen is below zinc and is less reactive than zinc. As hydrogen below zinc therefore will reduce more and earlier than zinc , hence will go to cathode and zinc will reduced or deposit at anode. therefore P will be connected to R and Q to S.hence ans is :C

Ans 3:

Class : Class 9
thus answer is a

Ans 4:

Class : Class 8
answer A

Ans 5:

Class : Class 3
And for this question must be A

Ans 6:

Class : Class 8
cation(Zn2 ) must be deposited to the cathode.

Ans 7:

Class : Class 9
my apologies for the previous explanation answer is : C

Ans 8:

Class : Class 8
WWWWRRRROOOONNNNNNNNNNGGGGGGGGGGGGGGGGG

Ans 9:

Class : Class 8

Ans 10:

Class : Class 8
the answer will be 'A'

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Subject :NSO    Class : Class 3

A note is shown here which Ravi has made about different types of house. Unfortunately when he had finished writing, some ink spilt over the page and covered some of the key words.
A wooden house made on a boat is called . It is common in Kashmir and . In areas with heavy rainfall houses are common. are built of snow and are found in very cold countries.
Select the correct sequence of hidden words to complete the note.

A Caravan, Rajasthan, Tent, Igloos
B Houseboat, Kerala, Stilt, Igloos
C Houseboat, Delhi, Kutcha, Igloos
D Tent, Karnataka, Caravan, Igloos


Ans 1:

Class : Class 3

Ans 2:

Class : Class 3
B

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
ans is c

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Plug key is also a type of switch.

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 7
c

Ans 2:

Class : Class 8
it needs to be sedimentation and decantation because the insoluble material present in the liquid is quite heavy you only perform filtration when the particles float over the surface of the water

Ans 3:

Class : Class 5
Ya, filtration can also remove insoluble impurities but in this case sedimentation and decanation is more appropriate answer.

Ans 4:

Class : Class 5
Yes, but in the given figure it is sedimentation

Ans 5:

Class : Class 7
sedimentation and decantation is the answer . but filtration can not come because we can see in the picture itself that the particles are big ,that's why sedimentation and decantation . if the particles are small but yet insoluble , then only it is filtration . I hope that you understood.

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
every single sound has its own secondary waves, so the correct option must be option C.

Ans 2:

Class : Class 7
correct option is c

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Subject :NSO    Class : Class 8

Read the given statements and select the correct option.
Statement 1 : Phosphorus burns in air at room temperature.
Statement 2 : It is an example of spontaneous combustion.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true and statement 2 is false.
D Both statements 1 and 2 are false.


I say it is option a but they say it is b....But isn’t this definitely due to spontaneous combustion?

Ans 1:

Class : Class 8
Hi, the statement 2 is true but just tells about the type type combustion to which the reaction given in statement belong. it does not tell about actual cause of burning of phosphorus in air at room temperature. the reason for statement 1 is that phosphorus is a highly reactive element that's why burns in air at room temperature.

Ans 2:

Class : Class 8

Ans 3:

Class : Class 9

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
Think in the way of leguminous crops

Ans 2:

Class : Class 8
Why so? In both the cases soybean is present.

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