Domestic Electric Circuits

Q. What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

Q.

When live wire comes in direct contact with the neutral wire, then?

1. Overloading happens

2. Short circuiting happens

3. Melting of the fuse happens

4. All of these.

Q.

Explain the reason why metal cases of electric appliances are earthed.

Q.

Explain briefly the function of following in household wiring

A three-pin plug

Q.

Which part of an electrical appliance is earthed?

Q.

In India, the frequency of the alternating current is maintained at 60 Hz.

1. True
2. False

Q.

Why should an electrical appliance be earthed?

Q.

What is the resistance of a connecting wire?

Q. What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

Q.

An appliance has three wires of colours red, black and green, and is connected to a three pin plug. The thickest pin is connected to which wire?

1. Black

2. Green

3. Red

4. All pins have the same thickness

Q.

Fill in the blanks.
The earth terminal is provided in an electrical appliance that draws ________ current (power).

Q. Question 3
What precaution should be taken to avoid the overloading of domestic electric circuits?

Q.

Mention the color code used for household wiring.

Q.

Live wire is:

1. Positive

2. Red

3. Insulation Covered

4. All of These

Q. The rating of a fuse connected in the general household lighting circuit is:

1. 15 A
2. 5 A
3. 10 A
4. zero

Q. Identify the earthing pin in the plug:

1. 
2. 
3. 
4. 

Q.

What is the difference between live and neutral wire?

Q.

In India, household circuits are rated at___.

1. 200 V AC

2. 230 V AC

3. 230 V DC

4. 250 V AC

Q.

Cables at home are laid in series circuits.

1. True
2. False

Q. Current flows only through circuit paths.

1. closed
2. ohmic
3. open

Q. An electric iron is rated $220$V, $2$kW. Why is the fuse absolutely necessary in a power circuit?

Q.

The most important safety method used for protecting home appliances from short circuiting or overloading is the use of ___.

Q.

What is meant by earthing of an electrical appliance? Why is it essential?

Q. RJ45 UTP cable has____ Cables.

1. 2 pair
2. 3 pair
3. 4 pair
4. 5 pair

Q.

It is dangerous to use a fuse higher than the correct rating.

1. True
2. False

Q. Which of the following statement is not true regarding twisted pair?

1. It consists of two insulated copper wires, typically about 1 mm thick
2. The purpose of twisting of the wires is to reduce electric interference from similar pairs
3. High cost
4. It can run several kilometres without amplification

Q. ntThe electric resistance of a certain wire of resistance R , if its length and radius are both doubled then the resistance will be?n ntExplain in detailn

Q.

Rama suspects that the LPG cylinder is leaking, and immediately turns the cylinder valve to the OFF
position. What should she do next?

A. Switch on all lights.
B. Switch off all lights.
C. Open all the windows.
D. Close all the windows.