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My Question Performance Summary in Full Tests !
Questions Available: 22
Questions Attempted: 10
Number of Attempts: 15
Correct Attempts: 8
Total Time Spent: 00:30
Avg Time Per Question: 00:02
My Question Performance Summary in Full Tests
A 10μF capacitor is connected to a 210V, 50Hz source as shown in figure. The peak current in the circuit is nearly (π = 3.14) :
(1). 0.58 A
(2). 0.93 A
(3). 1.20 A
(4). 0.35 A
(1). 0.58 A
(2). 0.93 A
(3). 1.20 A
(4). 0.35 A
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
The net magnetic flux through any closed surface is
(1). Positive
(2). Infinity
(3). Negative
(4). Zero
(1). Positive
(2). Infinity
(3). Negative
(4). Zero
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
The peak voltage of the ac source is equal to
(1). The value of voltage supplied to the circuit
(2). The rms value of the ac source
(3). \(\displaystyle \sqrt{2}\) times the rms value of the ac source
(4). \(\displaystyle \frac{1}{\sqrt{2}}\) times the rms value of the ac source
(1). The value of voltage supplied to the circuit
(2). The rms value of the ac source
(3). \(\displaystyle \sqrt{2}\) times the rms value of the ac source
(4). \(\displaystyle \frac{1}{\sqrt{2}}\) times the rms value of the ac source
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
In an ideal transformer, the turns ratio is \(\frac{N_P}{N_S} = \frac{1}{2}\). The ratio \(V_S : V_P\) is equal to (the symbols carry their usual meaning) :
(1). 1 : 2
(2). 2 : 1
(3). 1 : 1
(4). 1 : 4
(1). 1 : 2
(2). 2 : 1
(3). 1 : 1
(4). 1 : 4
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
The magnetic energy stored in an inductor of inductance 4μH carrying a current of 2A is
(1). 4 mJ
(2). 8 mJ
(3). 8 μJ
(4). 4 μJ
(1). 4 mJ
(2). 8 mJ
(3). 8 μJ
(4). 4 μJ
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
In a series LCR circuit, the inductance L is 10mH,capacitance C is 1μF and resistance R is 100Ω. The frequency at which resonance occurs is
(1). 15.9 kHz
(2). 1.59 rad∕ s
(3). 1.59 kHz
(4). 15.9 rad∕ s
(1). 15.9 kHz
(2). 1.59 rad∕ s
(3). 1.59 kHz
(4). 15.9 rad∕ s
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A 12V, 60W lamp is connected to the secondary of a step-down transformer, whose primary is connected to ac mains of 220V. Assuming the transformer to be ideal, what is the current in the primary winding?
(1). 2.7 A
(2). 3.7 A
(3). 0.37 A
(4). 0.27 A
(1). 2.7 A
(2). 3.7 A
(3). 0.37 A
(4). 0.27 A
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A square loop of side 1m and resistance 1Ω is placed in a magnetic field of 0.5 T . If the plane of loop is perpendicular to the direction of magnetic field, the magnetic flux through the loop is
(1). 2 weber
(2). 0.5 weber
(3). 1 weber
(4). Zero weber
(1). 2 weber
(2). 0.5 weber
(3). 1 weber
(4). Zero weber
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A series LCR circuit with inductance 10 H , capacitance 10 μF , resistance 50 Ω is connected to an ac source of voltage, V = 200 sin(100t) volt. If the resonant frequency of the LCR circuit is v0 and the frequency of the ac source is v, then
(1). \(\displaystyle v_0\, =\, v\, =\, 50\) Hz
(2). \(\displaystyle v_0\, =\, v\, =\, \frac{50}{\pi}\) Hz
(3). \(\displaystyle v_0\, =\, \frac{50}{\pi}\) Hz, \(v\, =\, 50\) Hz
(4). \(\displaystyle v\, =\, 100\)Hz; \(\displaystyle v_0\, =\, \frac{100}{\pi}\) Hz
(1). \(\displaystyle v_0\, =\, v\, =\, 50\) Hz
(2). \(\displaystyle v_0\, =\, v\, =\, \frac{50}{\pi}\) Hz
(3). \(\displaystyle v_0\, =\, \frac{50}{\pi}\) Hz, \(v\, =\, 50\) Hz
(4). \(\displaystyle v\, =\, 100\)Hz; \(\displaystyle v_0\, =\, \frac{100}{\pi}\) Hz
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A big circular coil of 1000 turns and average radius 10 m is rotating about its horizontal diameter at 2 rad−1. If the vertical component of earth's magnetic field at that place is 2 × 10−5T and electrical resistance of the coil is 12.56Ω, then the maximum induced current in the coil will be
(1). 0.25 A
(2). 1.5 A
(3). 1 A
(4). 2 A
(1). 0.25 A
(2). 1.5 A
(3). 1 A
(4). 2 A
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
(1). 0.2 A
(2). 0.4 A
(3). 2 A
(4). 4 A
(1). 0.2 A
(2). 0.4 A
(3). 2 A
(4). 4 A
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 > R2, the mutual inductance M between them will be directly proportional to
(1). \(\displaystyle \frac{R_1}{R_2}\)
(2). \(\displaystyle \frac{R_2}{R_1}\)
(3). \(\displaystyle \frac{R_1^2}{R_2}\)
(4). \(\displaystyle \frac{R_2^2}{R_1}\)
(1). \(\displaystyle \frac{R_1}{R_2}\)
(2). \(\displaystyle \frac{R_2}{R_1}\)
(3). \(\displaystyle \frac{R_1^2}{R_2}\)
(4). \(\displaystyle \frac{R_2^2}{R_1}\)
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is \(\pi /3\). If instead C is removed from the circuit, the phase difference is again \(\pi /3\) between current and voltage. The power factor of the circuit is:
(1). 0.5
(2). 1.0
(3). -1.0
(4). zero
(1). 0.5
(2). 1.0
(3). -1.0
(4). zero
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
In which of the following devices, the eddy current effect is not used?
(1). electric heater
(2). induction furnace
(3). magnetic braking in train
(4). electromagnet
(1). electric heater
(2). induction furnace
(3). magnetic braking in train
(4). electromagnet
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A 800 turn coil of effective area 0.05m2 is kept perpendicular to a magnetic field 5 × 10−5 T. When the plane of the coil is rotated by 90∘ around any of its coplanar axis in 0.1 s, the emf induced in the coil will be
(1). 0.02 V
(2). 2 V
(3). 0.2 V
(4). 2 × 10−3 V
(1). 0.02 V
(2). 2 V
(3). 0.2 V
(4). 2 × 10−3 V
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
The magnetic potential energy stored in a certain inductor is 25 mJ , when the current in the inductor is 60 mA. This inductor is of inductance
(1). 0.138 H
(2). 138.88 H
(3). 1.389 H
(4). 13.89 H
(1). 0.138 H
(2). 138.88 H
(3). 1.389 H
(4). 13.89 H
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
An inductor 20 mH , a capacitor 100 μF and a resistor 50 Ω are connected in series across a source of emf,
V = 10 sin 314 t. The power loss in the circuit is
(1). 0.79 W
(2). 0.43 W
(3). 2.74 W
(4). 1.13 W
V = 10 sin 314 t. The power loss in the circuit is
(1). 0.79 W
(2). 0.43 W
(3). 2.74 W
(4). 1.13 W
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A long solenoid of diameter 0.1 m has 2 × 104 turns per metre. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 0 A from 4 A in 0.05 s. If the resistance of the coil is 10π2Ω, the total charge flowing through the coil during this time is
(1). 16 μC
(2). 32 μC
(3). 16 πμC
(4). 32 π μC
(1). 16 μC
(2). 32 μC
(3). 16 πμC
(4). 32 π μC
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
Figure shows a circuit that contains three identical resistors with resistance R = 9.0Ω each, two identical inductors with inductance L =2.0 mH each, and an ideal battery with emf ε = 18V . The current i through the battery just after the switch closed is
(1). 0.2 A
(2). none of the above
(3). 0 A
(4). 2 mA
(1). 0.2 A
(2). none of the above
(3). 0 A
(4). 2 mA
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
An inductor 20 mH, a capacitor 50 μF and a resistor 40 Ω are connected in series across a source of emf
\(V\, =\, 10\,sin\,340\,t\). The power loss in A.C. circuit is
(1). 0.76 W
(2). 0.89 W
(3). 0.51 W
(4). 0.67 W
\(V\, =\, 10\,sin\,340\,t\). The power loss in A.C. circuit is
(1). 0.76 W
(2). 0.89 W
(3). 0.51 W
(4). 0.67 W
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A small signal voltage V (t) = V0 sin ωt is applied across an ideal capacitor C
(1). Current I(t) is in phase with voltage V(t).
(2). Current I(t) leads voltage V(t) by 180°.
(3). Current I(t), lags voltage V(t) by 90°
(4). Over a full cycle the capacitor C does not consume any energy from the voltage source
(1). Current I(t) is in phase with voltage V(t).
(2). Current I(t) leads voltage V(t) by 180°.
(3). Current I(t), lags voltage V(t) by 90°
(4). Over a full cycle the capacitor C does not consume any energy from the voltage source
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turn of the solenoid is 4 × 10 −3 Wb. The self-inductance of the solenoid is
(1). 2 H
(2). 1 H
(3). 4 H
(4). 3 H
(1). 2 H
(2). 1 H
(3). 4 H
(4). 3 H
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02