**DC Circuit MCQ Job Interview Exam Higher Study Admission Questions Answers part3**

**Identical wires of nichrome and copper are connected in series in a circuit. This results in greater**

**1****.****heat in nichrome**

*.*
2.
Two
resistance are in parallel and give equivalent resistance of 6/5 Ω. One of the
resistances is broken and the effective resistance is 2 Ω. The resistance of
the broken resistor is

**3 Ω**.
3.
Two
identical cells connected in series send 10 A through 5 Ω resistor. When they
are connected in parallel, they send 8 A through the same resistor. The
terminal resistance of each cell is

**2.5 Ω**.**Let E and r be the e.m.f and internal resistance of each cell.**

**For series grouping, 2E =(5+2r)*10…..(1)**

**For parallel grouping, E=(5+r/2)*8 …..(2)**

**Solving eq (1) & (2), r=2.5Ω**

4.
Two
batteries of different e.m.fs and same internal resistances are connected in
series with an external resistance and current is 3 A. When polarity of one is
reversed, the current is 1 A. The ratio of e.m.f s is

**2**.
5.
n similar resistors each of resistance r when connected in parallel have the total resistance R,

When these resistances are
connected in series, the total resistance is

**n^2R**.
6.
Kirchhoff’s
current law at a junction deals with

**conservation of charge**.
7.
Kirchhoff’s
voltage law deals with

**conservation of energy.**
8.
A
cell supplies a current of 0.9 A through 2 Ω external resistance and 0.3 A
through 7 Ω external resistance. The internal resistance of the cell is

**0.5 Ω**.**Let E and r be the e.m.f,**

**For the first case 0.9= E/2+r ,**

**For the second case 0.3= E/7+r ,**

**Solving these two equation r= 0.5 Ω**

9.
A
50 V battery is connected across 10 Ω resistor. The current is 4.5 A. The
internal resistance of the battery is

**1.1 Ω**.
10.

**An ordinary dry cell can deliver a current of about****1/8 A or 0.125 A**.