10 question-answer on grouping of cells
1. To draw a maximum current from a combination of cells, how should the cells be grouped?
(a) Parallel
(b) Series
(c) Mixed grouping
(d) Depends upon the relative values of internal and external resistances.
Ans: ( d)
2. Five cells each of internal resistance 0.2 Ω and e.m.f. 2 V are connected in series with a resistance of 4Ω. The current through the external resistance is
(a) 4A
(b) 2A
(c) 1 A
(d) 0.5A
Ans: (b)
3. Which of the following are true when the cells are connected in series?
(a) Current capacity decreases
(b) Current capacity increases
(c) The e.m.f. decreases
(d) The e.m.f. increases.
Ans: (d)
4. Which of the following is true when the cells are connected in parallel?
(a) Current capacity decreases
(b) Current capacity increases
(c) The e.m.f. decreases
(d) The e.m.f. increases.
Ans: (b)
5. If n cells each of e.m.f. E are connected in parallel, the e.m.f. of the combination is:
(a) E/n
(b) nE
(c) n2E
(d) E.
Ans: (d)
6. When cells are connected in parallel, then
(a) The current decreases
(b) The current increases
(c) The e.m.f. increases
(d) The e.m.f. decreases
Ans: (b)
7. The internal resistance of a cell depends on
(a) The distance between the plates
(b) The area of the plates immersed
(c) The concentration of the electrolyte
(d) All of the above.
8. A cell of internal resistance r is connected to an external resistance R. the current will be maximum in R, if
(a) R=r
(b) R < r
(c) R > r
(d) R = r/2
Ans: ( a)
9. To get the maximum current from a parallel combination of n identical cell each of internal resistance r in an external resistance R, when,
(a) R >> r
(b) R<<r
(c) R =r
(d) None of these
Ans: ( b)
10. Two identical cells send the same current in 3 Ω resistance, whether connected in series or in parallel. The internal resistance of the cell should be
(a) 1 Ω
(b) 3 Ω
(c) ½ Ω
(d) 3.5 Ω
Ans : ( b)
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