Tag: domestic electric circuits and safety precautions

Questions Related to domestic electric circuits and safety precautions

Which statement is wrong from the following?

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

  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.

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Correct Option: C
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.

Which one of the following is different from the others?

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

  1. Joule

  2. Kilowatt hour

  3. Erg

  4. Watt

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Correct Option: D

Which of the following statements is true?

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

  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.

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Correct Option: D
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)

Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1A. The current through the 40 W bulb will be

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

  1. $0.4 A$

  2. $0.6A$

  3. $0.8 A$

  4. $1 A$

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Correct Option: D
Explanation:

As the resistances are connected in series , same current will pass through them.

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

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

  1. $2 W$

  2. $1.28 W$

  3. $\dfrac{8}{9} W$

  4. $3.2 W$

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Correct Option: D

In which of the following the heating effect of an electric current is not used?

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

  1. Soldering

  2. Welding

  3. Earthing

  4. Fuse

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Correct Option: B

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 

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

  1. 510 K

  2. 200 K

  3. 100 K

  4. 73 K

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Correct Option: B

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-

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

  1. $30\ \Omega$

  2. $60\ \Omega$

  3. $15\ \Omega$

  4. $120\ \Omega$

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Correct Option: C

Two electric bulbs have 60 W and 100 W rating at 220 V then ratio of their resistances will be 

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

  1. 3:2

  2. 5:3

  3. 9:4

  4. 4:9

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Correct Option: B

A bulb rate $220 V, 100 W$ is connected across $110 V$ line. The power dissipated will be

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

  1. $100 W$

  2. $75 W$

  3. $ 52 W$

  4. $ 25 W$

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Correct Option: D