Alternating Current Test

Result

Alternating Current Test - 30

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Score
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Time Taken: -

Question 1/10
4 / -1

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

Correct

Wrong

Skipped
A
both B₁ & B₂ die out promptly

Correct

Wrong

Skipped
B
both B₁ & B₂ die out with some delay

Correct

Wrong

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C
B₁ dies out promptly but B₂ with some delay

Correct

Wrong

Skipped
D
B₂ dies out promptly But B₁ with some delay
Question 2/10
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.

Correct

Wrong

Skipped
A
M will repel R when it is moving towards R

Correct

Wrong

Skipped
B
M will attract R when it is moving towards R

Correct

Wrong

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

Correct

Wrong

Skipped
D
M will attract R when moving towards as well as away from R
Question 3/10
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

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A
Negative

Correct

Wrong

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B
Positive

Correct

Wrong

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C
B is +, A is –

Correct

Wrong

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D
B is -, A is +
Question 4/10
4 / -1

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

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A
A

Correct

Wrong

Skipped
B
B

Correct

Wrong

Skipped
C
both equally bright

Correct

Wrong

Skipped
D
cannot say

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Solutions
Question 5/10
4 / -1

Correct

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A

Correct

Wrong

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B

Correct

Wrong

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C

Correct

Wrong

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D
Question 6/10
4 / -1

In the circuit shown in fig at resonance:

Correct

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Skipped
A
the power factor is zero

Correct

Wrong

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B
the current through the a.c source is minimum

Correct

Wrong

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C
the current through the a.c source is maximum

Correct

Wrong

Skipped
D
currents through L and R are equal
Question 7/10
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

Correct

Wrong

Skipped
A

Correct

Wrong

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B

Correct

Wrong

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C

Correct

Wrong

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D
Question 8/10
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

Correct

Wrong

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

Correct

Wrong

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

Correct

Wrong

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

Correct

Wrong

Skipped
D
both, a.c. and d.c. voltages fall to nearly zero.
Question 9/10
4 / -1

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

Correct

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Skipped
A
0.05 J

Correct

Wrong

Skipped
B
0.5 J

Correct

Wrong

Skipped
C
1J

Correct

Wrong

Skipped
D
0.1J

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Solutions
Question 10/10
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

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A

Correct

Wrong

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B

Correct

Wrong

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C

Correct

Wrong

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D

Question 1/10

both B₁ & B₂ die out promptly

both B₁ & B₂ die out with some delay

B₁ dies out promptly but B₂ with some delay

B₂ dies out promptly But B₁ with some delay

Question 2/10

M will repel R when it is moving towards R

M will attract R when it is moving towards R

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

M will attract R when moving towards as well as away from R

Question 3/10

Negative

Positive

B is +, A is –

B is -, A is +

Question 4/10

A

B

both equally bright

cannot say

Question 5/10

Question 6/10

the power factor is zero

the current through the a.c source is minimum

the current through the a.c source is maximum

currents through L and R are equal

Question 7/10

Question 8/10

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

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

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

both, a.c. and d.c. voltages fall to nearly zero.

Question 9/10

0.05 J

0.5 J

1J

0.1J

Question 10/10

Question 1/10

both B1 & B2 die out promptly

both B1 & B2 die out with some delay

B1 dies out promptly but B2 with some delay

B2 dies out promptly But B1 with some delay

Question 2/10

M will repel R when it is moving towards R

M will attract R when it is moving towards R

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

M will attract R when moving towards as well as away from R

Question 3/10

Negative

Positive

B is +, A is –

B is -, A is +

Question 4/10

A

B

both equally bright

cannot say

Question 5/10

Question 6/10

the power factor is zero

the current through the a.c source is minimum

the current through the a.c source is maximum

currents through L and R are equal

Question 7/10

Question 8/10

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

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

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

both, a.c. and d.c. voltages fall to nearly zero.

Question 9/10

0.05 J

0.5 J

1J

0.1J

Question 10/10

both B₁ & B₂ die out promptly

both B₁ & B₂ die out with some delay

B₁ dies out promptly but B₂ with some delay

B₂ dies out promptly But B₁ with some delay