Subject :NSO Class : Class 9
Subject :NSO Class : Class 8
Ans 4:
Class : Class 9
When rubbed with fur, glass will become negatively charged. However if silk is used instead of fur, glass will acquire a positive charge.
Ans 6:
Class : Class 9
glass rod when rubbed with fur, it gives electrons to fur and becomes positively charged
Post Your Answer
Subject :NSO Class : Class 8
Post Your Answer
Subject :NSO Class : Class 5
Post Your Answer
Subject :NSO Class : Class 4
Post Your Answer
Subject :NSO Class : Class 10
Post Your Answer
Subject :NSO Class : Class 5
Ans 1:
Class : Class 3
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 2:
Class : Class 8
B because if Y expands and X contracts, X will be a lot smaller than Y. Here, both are almost the same size.
Ans 3:
Class : Class 2
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 4:
Class : Class 4
ans should be D as if metal x contracts and metal y expands then the 2 metals will bend inward an as an ellusion we see that y is longer than x
Ans 5:
Class : Class 1
The answer is B because the question says that he HEATED both the metals (most metals expand on heating) and Y has expanded more than X
Ans 12:
Class : Class 4
iron-nickel alloy notable for its lack of expansion or contraction with temperature changes. hence all metals do NOT expand
Ans 24:
Class : Class 7
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 .
Post Your Answer
Subject :NSO Class : Class 8
Ans 4:
Class : Class 6
i do feel that correct answer is A.as P has to be electroplated ,it must be on cathode(-ve).so,correct is =A
Ans 9:
Class : Class 6
answer should be A, as hydrogen is not released at cathode if the other cation is Zinc or below in the electrochemical series
Ans 17:
Class : Class 9
I will go mad with the number of wrong answers in this website.. answer should be a. For example when a spoon has to be electroplated with copper, copper is ALWAYS ON ANODE and the spoon is ALWAYS ON CATHODE. Why different logic is used here?
Ans 18:
Class : Class 10
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
Post Your Answer
Subject :NSO Class : Class 3
Post Your Answer
Subject :NSO Class : Class 7