Tag: electrical circuits

Quizzes (3) Questions (91)

Questions Related to electrical circuits

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

Which statement is wrong from the following?

  1. The earthing wire is green coloured.
  2. In India, current flowing through wire is AC and its frequency is $50 \,Hz$.
  3. In India, voltage between two wires is $110 \,V$.
  4. T.V., Tublight, bulbs are connected with $5\, A$ line.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In India, current flowing through wire is A.C and its frequency is $50Hz$ and voltage $220V$.But, Option C said voltage between two wires is 110V110V, which is wrong.

Therefore, C is correct option.

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

Which of the following statements is true?

  1. In tree type distribution of electric power, fuses are present only on the main board.

  2. In ring type distribution of electric power, there is an individual fuse for each appliance.

  3. Ring type distribution of electric power is advantageous than the tree type distribution.

  4. All the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In tree type distribution of electric power, fuses are present only on the distribution board where as in ring type, there is an individual fuse for each appliance. As there is an individual fuse for each appliance in ring type, only faulty appliance will not work and all the other appliances will not be affected. It is easier to install. So, ring type is advantageous than that of tree type. Hence, choice is (4)

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

Maximum power in a $0.5 \Omega$ resistance connected with two batteries of 2V emf  and $1 \Omega$ internal resistance in parallel is 

  1. $2 W$
  2. $1.28 W$
  3. $\dfrac{8}{9} W$
  4. $3.2 W$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Two identical batteries of emf E = 2V and internal resistance r = 1 ohm in parallel have an equivalent emf of 2V and internal resistance r_eq = 1/2 = 0.5 ohm. The maximum power is transferred to the load resistance R when R equals the internal resistance of the source, R = r_eq = 0.5 ohm. The maximum power formula is P = E^2 / (4 * r_eq), which evaluates to 2^2 / (4 * 0.5) = 4 / 2 = 2 W.

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

At a temperature T K,the pressure of 4.0 g argon in a bulb is p.The bulb is put in a bath having temperature higher by 50 K than the one.0.8 g of argon gas had to be removed to maintained ariginal pressure.The temperature T is equal to 

  1. 510 K

  2. 200 K

  3. 100 K

  4. 73 K
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using PV = nRT. Initially: pV = (4/M)RT. Finally: pV = (3.2/M)R(T+50). Equating: 4T = 3.2(T+50) => 4T = 3.2T + 160 => 0.8T = 160 => T = 200 K.

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

in electric bulb rated $160W,80\ V$ has to be operated across  $100\ V,50Hz$ a.c supply. The reactance Which is series with bulb should be-

  1. $30\ \Omega$
  2. $60\ \Omega$
  3. $15\ \Omega$
  4. $120\ \Omega$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

First find the resistance of the bulb using R = V^2 / P = 80^2 / 160 = 40 ohms, and its rated current I = P / V = 160 / 80 = 2 A. When connected across a 100 V supply, the total impedance Z of the bulb and inductor in series is Z = V_total / I = 100 / 2 = 50 ohms. Since Z^2 = R^2 + X_L^2, we get 50^2 = 40^2 + X_L^2, which gives X_L = 30 ohms.