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Circuit diagram & commonly used symbols

An electrical...

Question

An electrical circuit for a set of 4 lights depends on a system of switches A, B, C and D. When these switches work they have the following effect on the lights: They each change the state of two lights (i.e. on becomes off and off becomes on). The lights that each switch controls are as follows.
$\begin{matrix} A & B & C & D 1 a n d 2 & 2 a n d 4 & 1 a n d 3 & 3 a n d 4 \end{matrix}$

In configuration 1 shown below, switches CBDA are activated in turn, resulting in configuration 2. One switch did not work and had no effect at all. Which was that switch?

A

A

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B

B

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C

C

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D

D

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Solution

The correct option is C
C

If all the switches were on the configuration 2 would be:

But the configuration 2 is given as:

There is difference only in Switches 1 and 3. So switch C is not working.

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Similar questions

An electrical circuit for a set of

4

lights depends on a system of switches

A, B, C

D

. When these switches work they have the following effect on the lights: They each change the state of two lights (i.e. on becomes off and off becomes on). The lights that each switch controls are as follows.

$A$	$B$	$C$	$D$
$1$ and $2$	$2$ and $4$	$1$ and $3$	$3$ and $4$

In configuration

1

shown below, switches

C B D A

are activated in turn, resulting in configuration

2

. One switch did not work and had no effect at all. Which was that switch?

Q. Two capacitors

C_{1}

C_{2}

are joined in series where

C_{2} = 4 C_{1}

. They are connected in a circuit with a switch between them as shown in figure. When the switch is open, net charge on

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2 Q

Now, the switch is closed. At steady state, the charge on each capacitor will be

Q. When the switch was closed in the circuit shown here, the bulbs did not light up.
May be one of the bulbs is fused. How can it be determined which bulb is fused?
figure

(a) Close the switch and notice which bulb does not light up.
(b) Close the switch after removing one bulb at a time until the others light up.
(c) Close the switch and replace the three bulbs with a new one.
(d) There is no way to find out.

A, B

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A^{'}, B^{'}

C^{'}

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Q. An electric bulb, a capacitor, battery and a switch are all in series in a circuit. How does the intensity of light vary when the switch is turned on?

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