Soap helps in cleaning clothes, because |
|
|||
(a) |
chemical of soap change |
(b) |
it increases the surface tension of the solution |
|
(c) |
it absorbs the dirt |
(d) |
it lowers the surface tension of the solution |
Soap helps in cleaning clothes, because |
|
|||
(a) |
chemical of soap change |
(b) |
it increases the surface tension of the solution |
|
(c) |
it absorbs the dirt |
(d) |
it lowers the surface tension of the solution |
The sides of a triangle lie on the lines
and
. let
be the centre of the circle inscribed in
. The value of
equals
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