Tag: physics

Questions Related to physics

B). Solve the previous question if the closed loop is completely
enclosed. In the circuit containing the switch.

physics household circuits electric switch switch electrical circuit

  1.  An anticlockwise current-pulse

  2.  A clockwise current-pulse

  3.  An anticlockwise current-pulse and then an anticlockwise current-pulse

  4. A clockwise current-pulse and then an anticlockwise current-pulse

Show answer
Correct Option: C

In a household electric circuit

physics household circuits electric switch switch electrical circuit

  1. all electric appliances drawing power are joined in parallel.

  2. a switch may be either in series or in parallel with the appliance which it controls.

  3. if a switch is in parallel with an appliance, it will draw power when the switch is in the 'off' position (open).

  4. if a switch is in parallel with an appliance, the fuse will blow (burn out) when the switch is put 'on' (closed).

Show answer
Correct Option: A,C,D
Explanation:

In the household if the appliances are connected in series, if one appliance is turned off then the whole circuit breaks and all other will get turned off. So they are always connected in parallel so that we can use appliances independent of other.
The switch of an appliance must be connected in series because the purpose of a switch is to turn off/on (break and connect the circuit). So when we connect the switch in series, the appliance turn's on when switch is closed and off when open.
If the switch is connected in parallel, even when it is off(open) the appliance draws power and when it is on the terminals of the appliance gets shorted and blows the fuse.

In an household electric circuit, which of the following is/are correct?
(A) All electric appliances drawing power are joined in parallel.
(B) A switch may be either in series or in parallel with the appliance which it controls.
(C) If a switch is in parallel with an appliance, it will draw power when the switch is in the 'off' position (open).
(D) If a switch is in parallel with an appliance, the fuse will blow (burn out) when the switch is put 'on' closed.

physics household circuits electric switch switch electrical circuit

  1. A, D

  2. A, C, D

  3. B, C, D

  4. A, B, D

Show answer
Correct Option: B
Explanation:

In the household if the appliances are connected in series, if one appliance is turned off then the whole circuit breaks and all other will get turned off. So they are always connected in parallel so that we can use appliances independent of other.
The switch of an appliance must be connected in series because the purpose of a switch is to turn off/on (break and connect the circuit). So when we connect the switch in series, the appliance turn's on when switch is closed and off when open.
If the switch is connected in parallel, even when it is off(open) the appliance draws power and when it is on the terminals of the appliance gets shorted and blows the fuse.

State whether true or false.
A switch is used to close or open an electric circuit.

physics household circuits electric switch switch electrical circuit

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

A switch is a device that is used to  open or close a circuit to control the flow of current in a circuit.


Given statement is $True$.

Switches of the electric appliances are connected in the _____ wire.

physics household circuits electric switch switch electrical circuit

  1. neutral

  2. line

  3. earth

  4. all

Show answer
Correct Option: B
Explanation:

Each local circuit in a room is provided with a seperate switcho switches are connected in the live wire, so that when the switch is in the off portion, no point of the connected electric appliance will be at higher potential.

In a household electric circuit:

physics household circuits electric switch switch electrical circuit

  1. all electric appliances drawing power are joined in parallel

  2. a switch may be either in series or in parallel with the appliance which it controls

  3. if a switch is in parallel with an appliance, it will draw power when the switch in the off position (open)

  4. if a switch is in parallel with an appliance, the fuse will blow (burn out) when the switch is put on (closed)

Show answer
Correct Option: A,C,D
Explanation:

All appliances in houses are connected parallel so that even if one get damaged , others will work properly and all appliances are independent .
If switch is connected in parallel, there will be short circuit when  switch is on and hence fuse will be blown and when switch is off, the appliance will draw power and there won't be any short circuit.

Of the three connecting wires in a household circuit : (i) Which of the three wires should the switch be connected ?

physics household circuits electric switch switch electrical circuit

  1. Live

  2. Neutral

  3. Earth

  4. All of these

Show answer
Correct Option: A
Explanation:

Switch must be connected to the live wire so that it can disconnect the circuit when it is switched off.

For the plate voltage, the plate current in a triode valve is maximum when the potential of :

physics electronic devices introduction to diodes circuit components junction diode and its voltage current characteristics

  1. The gird is positive and plate is negative

  2. The grid is zero and plate is positive

  3. The grid is negative and plate is positive

  4. The grid is positive and plate is positive

Show answer
Correct Option: D

For detecting intensity of light we use

physics electronic devices introduction to diodes circuit components junction diode and its voltage current characteristics

  1. Photodiode in forward bias

  2. Photodiode in reverse bias

  3. LED in forward bias

  4. LED in reverse bias

Show answer
Correct Option: A

In the forward bias characteristic curve, a diode appears as :

physics electronic devices introduction to diodes circuit components junction diode and its voltage current characteristics

  1. an OFF switch

  2. a high resistance

  3. an ON switch

  4. a capacitor

Show answer
Correct Option: C
Explanation:

Diode allows the current to pass through it when it is forward biased.
In the forward biased characteristics curve, a diode appears as an ON switch.