Pl me solve the first and second

(1)

we know that

potential will be added when cells are connected in series

so, the polarity must be same

positive of one cell must be connected to negative of another cell

we can see only one option

option-(i)......Answer

(2)

(A)

we know that

so, smaller value of I means larger value of R

so,

option-3.....Answer

(B)

we know that

maximum resistances can be obtained when resistors are connected in series

so,

so, option-4........Answer

(C)

we know that series combination

we add resistances

so, we will get largest value of equivalent resistance

so, option-2..........Answer

go hook jvc hgv cj xk jvc 6756

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.