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Current Electricity

178 Questions Start Allen Test
All Exams Allen
Q51 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
In the circuit shown in figure, find the current through the branch BD.
A.
$1\mathrm{A}$
B.
$5\mathrm{A}$
C.
$3\mathrm{A}$
D.
$7\mathrm{A}$
Q52 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
In the circuit shown below, the reading of the voltmeter V is :-
A.
$12\mathrm{V}$
B.
$8\mathrm{V}$
C.
$20\mathrm{V}$
D.
$16\mathrm{V}$
Q53 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
Find the potential of J with respect of G :-
A.
$40\mathrm{V}$
B.
$60\mathrm{V}$
C.
$20\mathrm{V}$
D.
$30\mathrm{V}$
Q54 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
Find the potential difference across the $24 \Omega$ :
A.
48 volts
B.
2 volts
C.
4 volts
D.
1 volts
Q55 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
In a network as shown in the figure the potential difference across the resistance 2R is (the cell has an emf E with no internal resistance):
A.
$2\mathrm{E}$
B.
$\frac{4\mathrm{E}}{7}$
C.
$\frac{\mathrm{E}}{7}$
D.
E
Q56 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
The reading of ammeter is $I_{1}$ when only $S_{1}$ is closed and $I_{2}$ when only $S_{2}$ is closed. The reading is $I_{3}$ when both $S_{1}$ & $S_{2}$ are closed simultaneously then :-
A.
$\mathrm{I}_1 > \mathrm{I}_2 > \mathrm{I}_3$
B.
$\mathrm{I}_2 > \mathrm{I}_3 > \mathrm{I}_1$
C.
$\mathrm{I}_3 > \mathrm{I}_2 > \mathrm{I}_1$
D.
$\mathrm{I}_3 > \mathrm{I}_1 > \mathrm{I}_2$
Q57 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
How will the reading of ammeter change if the key k is closed?
A.
Increase
B.
Decrease
C.
Remains same
D.
Information insufficient
Q58 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
Six resistors each of $10 \Omega$ are connected as shown. The equivalent resistance between points X and Y is :
A.
$20\Omega$
B.
$5\Omega$
C.
$25 / 3\Omega$
D.
$10\Omega$
Q59 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
Five equal resistances each of resistance R are connected as shown in the Figure. A battery of voltage V is connected between A and B. The current flowing in AFCEB will be
A.
$\frac{\mathrm{V}}{\mathrm{R}}$
B.
$\frac{\mathrm{V}}{2\mathrm{R}}$
C.
$\frac{2\mathrm{V}}{\mathrm{R}}$
D.
$\frac{3\mathrm{V}}{\mathrm{R}}$
Q60 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
In a typical Wheatstone bridge the resistance in cyclic order are $A = 10 \Omega$ , $B = 5 \Omega$ , $C = 4\Omega$ and $D = 4 \Omega$ . For the bridge to be balanced :

(a) 10 Ω should be connected in parallel with A
(b) 10 Ω should be connected in series with A
(c) 5 Ω should be connected in series with B
(d) 5 Ω should be connected in parallel with B
A.
a, b
B.
b, c
C.
a, c
D.
all
Q61 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
Seven resistances are connected as shown in the figure. The equivalent resistance between A and B is :-
A.
3 Ω
B.
4 Ω
C.
4.5 Ω
D.
5 Ω
Q62 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
In the following circuit diagram the value of resistance X for the potential difference between B and D to be zero is :-
A.
4 ohms
B.
6 ohms
C.
56 ohms
D.
9 ohms
Q63 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
In the arrangement of resistances shown in the circuit, the potential difference between points B and D will be zero, when the unknown resistance X is :-
A.
4 Ω
B.
3 Ω
C.
2 Ω
D.
1 Ω
Q64 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
The resistance of each arm of a Wheat stone bridge is 10 Ω. A resistance of 10 Ω is connected in series with the galvanometer then the equivalent resistance across the battery will be :-
A.
10 Ω
B.
15 Ω
C.
20 Ω
D.
40 Ω
Q65 Allen COMBINATION OF RESISTANCES & KIRCHHOFF'S LAW MCQ
For the network shown in the figure the value of the current i is :-
A.
$\frac{18\mathrm{V}}{5}$
B.
$\frac{5\mathrm{V}}{9}$
C.
$\frac{9\mathrm{V}}{35}$
D.
$\frac{5\mathrm{V}}{18}$
Q66 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
Two cells X and Y are connected to a resistance of $10 \Omega$ as shown in the figure. The terminal voltage of cell Y is :-
A.
zero
B.
$2\mathrm{V}$
C.
$4\mathrm{V}$
D.
$10\mathrm{V}$
Q67 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
A battery has e.m.f. 4 V and internal resistance 'r'. When this battery is connected to an external resistance of 2 ohms, a current of 1 A flows in the circuit. What current will flow if the terminals of the battery are connected directly?
A.
1 A
B.
2 A
C.
4 A
D.
infinite
Q68 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
Internal resistance of primary cell depends on :-
A.
the nature of electrolyte
B.
the area of plates immersed in the electrolyte
C.
the concentration of electrolyte and distance between the plates
D.
all the above
Q69 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
The potential difference between the terminals of a cell is found to be 3 volts when it is connected to a resistance of value equal to its internal resistance. The e.m.f. of the cell is:
A.
3 V
B.
6 V
C.
1.5 V
D.
4.5 V
Q70 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
A current of 2 A is flowing through a cell of e.m.f. 5 V and internal resistance 0.5 Ω from negative to positive electrode. If the potential of negative electrode is 10 V, the potential of positive electrode will be :-
A.
5 V
B.
14 V
C.
15 V
D.
16 V
Q71 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
In the following circuit if $V_{A}-V_{B}=4V$ , then the value of resistance X in ohms will be :-
A.
5
B.
10
C.
15
D.
20
Q72 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
Electromotive force of a cell is basically a
A.
force
B.
power
C.
work
D.
current capacity
Q73 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
The terminal voltage is $\frac{E}{2}$ when a current of 2 A is flowing through 2 Ω resistance; the internal resistance of the cell is:-
A.
1 Ω
B.
2 Ω
C.
3 Ω
D.
4 Ω
Q74 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
When a resistance of 2 ohms is connected across the terminals of a cell, the current is 0.5 A. When the resistance is increased to 5 ohms, the current becomes 0.25 A. The e.m.f. of the cell is:-
A.
1.0 V
B.
1.5 V
C.
2.0 V
D.
2.5 V
Q75 Allen CELLS & COMBINATION OF CELLS, ELECTRIC POWER & ENERGY MCQ
A cell of e.m.f. 2 V and negligible internal resistance is connected to resistors $R_{1}$ and $R_{2}$ as shown in the figure. The resistance of the voltmeter, $R_{1}$ and $R_{2}$ are 80 Ω, 40 Ω and 80 Ω respectively. The reading of the voltmeter is :
A.
$1.78\mathrm{V}$
B.
$1.60\mathrm{V}$
C.
$0.80\mathrm{V}$
D.
$1.33\mathrm{V}$