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Current Electricity

178 Questions Start Allen Test
All Exams Allen
Q151 Allen PYQ MCQ
The given circuit shows a uniform straight wire AB of 40 cm length fixed at both ends. In order to get zero reading in the galvanometer G, the free end of J is to be placed from B at :
A.
$32 \mathrm{~cm}$
B.
8 cm
C.
16 cm
D.
24 cm
Q152 Allen ANALYTICAL QUESTIONS MCQ
Three voltmeters all having different resistance, are joined as shown. When some potential difference is applied across A and B, their readings are $V_{1}$ , $V_{2}$ and $V_{3}$ . Then

(a) $V_{1} = V_{2}$ (b) $V_{1} \neq V_{2}$ (c) $V_{1} + V_{2} = V_{3}$ (d) $V_{1} + V_{2} > V_{3}$
A.
only a is correct
B.
only b is correct
C.
only c is correct
D.
only b & c are correct
Q153 Allen ANALYTICAL QUESTIONS MCQ
In the circuit shown in figure it is given that $V_{b} - V_{a} = 2$ volt. Choose the correct options.

(a) Current in the wire is 6 A
(b) Direction of current is from a to b
(c) $V_{a} - V_{c} = -12$ volt
(d) $V_{c} - V_{a} = -12$ volt
A.
only a & b
B.
only b & c
C.
only a & c
D.
all
Q154 Allen ANALYTICAL QUESTIONS MCQ
A battery of e.m.f E and internal resistance r is connected to a resistance R which can be adjusted to any value greater than or equal to zero. A graph is plotted between the current passing through the resistance (I) and potential difference (V) across it. Select the correct alternatives

(a) Internal resistance of the battery is 5Ω
(b) emf of the battery is 10 V
(c) maximum current which can be taken from the battery is 2A
(d) V-I graph can never be a straight lines as shown in the figure
(1) only a & b
B.
a, b & c
C.
only b & c
D.
all
Q155 Allen ANALYTICAL QUESTIONS MCQ
Two heaters designed for the same voltage V have different power ratings. When connected individually across a source of voltage V, they produce H amount of heat each in times $t_{1}$ and $t_{2}$ respectively. When used together across the same source, they produce H amount of heat in time t. Then correct option is
(a) If they are in series, $t = t_{1} + t_{2}$ (b) If they are in series, $t = 2(t_{1} + t_{2})$ (c) If they are in parallel, $t = \frac{t_{1}t_{2}}{(t_{1} + t_{2})}$ (d) If they are in parallel, $t = \frac{t_{1}t_{2}}{2(t_{1} + t_{2})}$
A.
only a & c
B.
only a & b
C.
only c & d
D.
all
Q156 Allen ANALYTICAL QUESTIONS MCQ
In the network shown in figure, points A, B and C are at potentials of 70 V, 0 and 10 V respectively.

(a) Point D is at a potential of 40V.
(b) The currents in the sections AD, DB, DC are in the ratio 3:2:1
(c) The currents in the sections AD, DB, DC are in the ratio 1:2:3.
(d) The network draws a total power of 200 W.
A.
only a is correct
B.
a and c are correct
C.
a, b, d are correct
D.
None of these
Q157 Allen ANALYTICAL QUESTIONS MCQ
When some potential difference is maintained between A and B, current I enters the network at A and leaves at B see figure.

(a) The equivalent resistance between A and B is $8\Omega$
(b) C and D are at the same potential.
(c) No current flows between C and D
(d) Current 3I/5 flows from D to C.
A.
a, b, d are correct
B.
a, d are correct
C.
a, c, d are correct
D.
all are correct
Q158 Allen ANALYTICAL QUESTIONS MCQ
For the circuit shown in figure, match the two columns.
Column-IColumn-II
(A)Current in wire ae
(B)Current in wire be
(C)Current in wire ce
(D)Current in wire de
(P)1 A
(Q)2 A
(R)0.5 A
(S)Zero
A.
A-Q, B-S, C-Q, D-S
B.
A-Q, B-Q, C-S, D-P
C.
A-P, B-R, C-S, D-Q
D.
A-Q, B-R, C-P, D-S
Q159 Allen ANALYTICAL QUESTIONS MCQ
Current i is flowing through a wire of non-uniform cross section as shown. Match the following two columns.
Column-IColumn-II
(A)Current density
(B)Electric field
(C)Resistance per unit length
(D)Potential difference per unit length
(P)is more at 1
(Q)is more at 2
(R)is same at both sections 1 and 2
(S)data insufficient
A.
A-P, B-P, C-P, D-P
B.
A-Q, B-R, C-S, D-P
C.
A-Q, B-Q, C-P, D-P
D.
A-P, B-Q, C-R, D-S
Q160 Allen ANALYTICAL QUESTIONS MCQ
In the circuit shown in figure, after closing the switch S, match the following two columns.
Column-IColumn-II
(A)Current through $R_1$
(B)Current through $R_2$
(C)Potential difference across $R_1 $
(D)Potential difference across $R_2$
(P)will increase
(Q)will decrease
(R)will remain same
(S)data insufficient
A.
A-P, B-Q, C-R, D-S
B.
A-P, B-R, C-S, D-Q
C.
A-P, B-R, C-S, D-P
D.
A-Q, B-P, C-Q, D-P
Q161 Allen ANALYTICAL QUESTIONS MCQ
Match the following two columns.
Column-IColumn-II
(A)Electrical resistance
(B)Electrical potential
(C)Specific resistance
(D)Specific conductance
(P)$[ML^3T^{-3}A^{-2}]$
(Q)$[ML^2T^{-3}A^{-2}]$
(R)$[ML^2T^{-3}A^{-1}]$
(S)None of these
A.
A-Q, B-S, C-R, D-P
B.
A-Q, B-R, C-P, D-S
C.
A-P, B-Q, C-S, D-R
D.
A-P, B-R, C-Q, D-S
Q162 Allen ANALYTICAL QUESTIONS MCQ
In the circuit shown in the figure, match the following two columns:
Column-IColumn-II
(A)Potential difference across battery A
(B)Potential difference across battery B
(C)Net power consumed by R
(D)Potential difference across R
(P)Zero
(Q)1
(R)2
(S)3
A.
A-P, B-Q, C-R, D-S
B.
A-S, B-Q, C-R, D-P
C.
A-S, B-R, C-Q, D-Q
D.
A-Q, B-R, C-S, D-S
Q163 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Drift velocity of electron in a metallic wire will decrease if temperature of wire is increased
Reason (R) : On increasing temperature conductivity of metallic wire decreases.
In the light of the above statements,
choose the most appropriate answer from the options given below:
A.
Both (A) and (R) are true and (R) is the correct explanation of (A).
B.
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
C.
(A) is true but (R) is false.
D.
(A) is false but (R) is true.
Q164 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Resistance of ammeter is less than resistance of milliammeter, (If made from same galvanometer)
Reason (R) : Value of shunt resistance in case of ammeter is more than a milliammeter.
In the light of the above statements,
choose the most appropriate answer from the options given below:
A.
Both (A) and (R) are true and (R) is the correct explanation of (A).
B.
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
C.
(A) is true but (R) is false.
D.
(A) is false but (R) is true.
Q165 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Electric field is present inside the current carrying wire.
Reason (R) : The principle of conservation of charge is followed, when charges are in motion.
In the light of the above statements,
choose the most appropriate answer from the options given below:
A.
Both (A) and (R) are true and (R) is the correct explanation of (A).
B.
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
C.
(A) is true but (R) is false.
D.
(A) is false but (R) is true.
Q166 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In balanced Wheatstone bridge, the current through cell depends on resistance of galvanometer.
Reason (R) : At balanced condition current through galvanometer is zero.
In the light of the above statements,
choose the most appropriate answer from the options given below:
A.
Both (A) and (R) are true and (R) is the correct explanation of (A).
B.
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
C.
(A) is true but (R) is false.
D.
(A) is false but (R) is true.
Q167 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In series combination of electrical bulb, lower power rating bulb emits more light than that of higher power rating bulb.
Reason (R): The lower power rating bulb in series gets more current than the higher power rating bulb.
In the light of the above statements,
choose the most appropriate answer from the options given below:
A.
Both (A) and (R) are true and (R) is the correct explanation of (A).
B.
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
C.
(A) is true but (R) is false.
D.
(A) is false but (R) is true.
Q168 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): When an external resistor of resistance R (connected across a cell of internal resistance r) is varied, power consumed by resistance R is maximum when R = r.
Reason (R): Power consumed by a resistor of constant resistance R is maximum when current through it is maximum.
In the light of the above statements,
choose the most appropriate answer from the options given below:
A.
Both (A) and (R) are true and (R) is the correct explanation of (A).
B.
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
C.
(A) is true but (R) is false.
D.
(A) is false but (R) is true.
Q169 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Ohm's law holds only for small currents in metallic wire not for high currents.
Reason (R): For metallic wire resistance increases with increase in temperature.
In the light of the above statements,
choose the most appropriate answer from the options given below:
A.
Both (A) and (R) are true and (R) is the correct explanation of (A).
B.
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
C.
(A) is true but (R) is false.
D.
(A) is false but (R) is true.
Q170 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In a Meter Bridge experiment, null point for an unknown resistance is measured. Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance.
Reason (R): Resistance of a metal increases with increase in temperature.
In the light of the above statements,
choose the most appropriate answer from the options given below:
A.
Both (A) and (R) are true and (R) is the correct explanation of (A).
B.
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
C.
(A) is true but (R) is false.
D.
(A) is false but (R) is true.
Q171 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Kirchoff's loop law represents conservation of energy
Reason (R) : If the sum of "Potential Differences" around a closed loop is zero, unlimited energy could be gained by repeatedly carrying a charge around a loop
In the light of the above statements,
choose the most appropriate answer from the options given below:
A.
Both (A) and (R) are true and (R) is the correct explanation of (A).
B.
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
C.
(A) is true but (R) is false.
D.
(A) is false but (R) is true.
Q172 Allen ANALYTICAL QUESTIONS MCQ
If the current in resistance of uniform cross section is doubled then, (assume temperature to be approximately constant).
(A) the current density is doubled
(B) the conduction electron density is doubled
(C) the mean time between collision is constant
(D) the electron drift speed is doubled
A.
A, C, D
B.
B, C, D
C.
A, B, C
D.
A, B, C, D
Q173 Allen ANALYTICAL QUESTIONS Match the Columns
A resistor of varying cross-section is attached with a battery as shown. Variation of area from both ends are similar and areas are same at ends and maximum at centre. Match the approximate graphical representation of various physical properties in columns, where x axis represents position from end A of resistor and y-axis various physical properties. Match Column-I with Column-II

Column-IColumn-II
(A)i (current)
(B)j (current density)
(C)E (electric field)
(D)$V_{d}$ (potential)
(P) image.png
(Q) image.png
(R)
(S) (T) image.png
A.
A → S, B → P, C → P, D → R
B.
A → Q, B → P, C → P, D → R
C.
A → T, B → Q, C → P, D → S
D.
A → Q, B → P, C → P, D → T
Q174 Allen ANALYTICAL QUESTIONS MCQ
In the given circuit the current flowing through the resistance 20 ohms is 0.3 ampere while the ammeter reads 0.9 ampere. What is the value of $R_{1}$ (in ohms).
A.
20Ω
B.
15Ω
C.
30Ω
D.
60Ω
Q175 Allen ANALYTICAL QUESTIONS MCQ
Statement 1: Voltage across a battery is always less than its emf. and Statement 2 : There is always some loss of energy due to internal resistance of the battery. .
A.
If both statements are TRUE and STATEMENT 2 is the correct explanation of STATEMENT 1.
B.
If both statements are TRUE but STATEMENT 2 is not the correct explanation of STATEMENT 1.
C.
If STATEMENT 1 is TRUE and STATEMENT 2 is FALSE.
D.
If STATEMENT 1 is FALSE but STATEMENT 2 is TRUE.