Alternating Current Test

Result

Alternating Current Test - 30

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Weekly Quiz Competition

Question 1
4 / -1

Fig. represents two bulbs B₁ & B₂ resistor R and an inductor L. When the switch S is turned off

A
both B₁ & B₂ die out promptly

B
both B₁ & B₂ die out with some delay

C
B₁ dies out promptly but B₂ with some delay

D
B₂ dies out promptly But B₁ with some delay
Question 2
4 / -1

A conducting ring R is placed on the axis of a barmagnet M. The plane of R is perpendicular to the axis. M can move along this axis.

A
M will repel R when it is moving towards R

B
M will attract R when it is moving towards R

C
M will repel R when moving towards as well as away from R

D
M will attract R when moving towards as well as away from R
Question 3
4 / -1

A conducting rod AB moves parallel to X- axis in a uniform magnetic field pointing in the positive Z direction. The ends A and B are charged as

A
Negative

B
Positive

C
B is +, A is –

D
B is -, A is +
Question 4
4 / -1

If A and B are identical bulbs, which bulb glows brighter in the circuit shown?

A
A

B
B

C
both equally bright

D
cannot say

Solution
Question 5
4 / -1

A

B

C

D
Question 6
4 / -1

In the circuit shown in fig at resonance:

A
the power factor is zero

B
the current through the a.c source is minimum

C
the current through the a.c source is maximum

D
currents through L and R are equal
Question 7
4 / -1

A coil of resistance R and inductance L is connected to a battery of e.m.f E volt. The final current in the coil is

A

B

C

D
Question 8
4 / -1

An inductance has a high resistance to a.c. and low to d.c. when a d.c. voltage source having some a.c. component superimposed on it sends current through an inductance to load resistance

A
the d.c. voltage falls appreciably across the load and a.c. component falls by only a small amount

B
the a.c. voltage falls appreciably across the load and d.c. voltage falls by only a small amount

C
both a.c. and d.c. voltages fall by the same small percentage

D
both, a.c. and d.c. voltages fall to nearly zero.
Question 9
4 / -1

A 100 mH coil carries a current of 1 A. Energy stored in magnetic field is

A
0.05 J

B
0.5 J

C
1J

D
0.1J

Solution
Question 10
4 / -1

The output current versus time curve of a rectifier is shown in Fig. The average value of the output current in this case is

A

B

C

D