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Earthing and Electrical Safety - class-IX

Electrical earthing, grounding, and safety practices in household circuits

20 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

The word "earthing" also implies:

  1. charging of a body.
  2. discharging of a body.
  3. putting a body on the surface of earth.
  4. putting a body under the surface of earth.
Question 2 Multiple Choice (Single Answer)

Earthing is provided in buildings to protect it from:

  1. lightning.
  2. leakage of electric current.
  3. cyclone.
  4. thunderstorm.
Question 3 Multiple Choice (Single Answer)

Which of the following statements is correct?

  1. A wire with a green insulation is usually the live wire
  2. MCB works on the heating effect of current
  3. The earth wire should be connected to the body of an appliance
  4. A fuse should always be placed in the neutral wire ofa mains circuit
Question 4 Multiple Choice (Single Answer)
State whether true or false.
An earthing connection allows the excess electrons to flow into the earth.
  1. True
  2. False
Question 5 Multiple Choice (Single Answer)

The potential difference between live wire and neutral wire is

  1. $100 V$
  2. $200 V$
  3. $50 V$
  4. None of these
Question 6 Multiple Choice (Single Answer)

In case of household circuit, earth wire is connected to

  1. Input terminals of $kwh$ meter
  2. Body of the $kwh$ meter
  3. Both
  4. None
Question 7 Multiple Choice (Single Answer)

If the insulation of live wire got damages and the live wire comes in contact with the metallic body of the appliance. When such electric appliance is connected to the mains, if not connected to the earth wire will also be raised to

  1. $440 V$
  2. $110 V$
  3. $220 V$
  4. $600 V$
Question 8 Multiple Choice (Single Answer)

What is the main purpose of earthing electrical appliances?

  1. To present overloading
  2. To present short circuting
  3. To prevent the person form electric shock
  4. None of these
Question 9 Multiple Choice (Single Answer)

Earthing elements used can be

  1. Copper wire
  2. Copper plate
  3. Salt
  4. All
Question 10 Multiple Choice (Single Answer)

Fill in the blank :


_________ metres deep hole is dug in the ground for the purpose of earthing. 

  1. 2-3m
  2. 6-8m
  3. 100m
  4. 20-27m
Question 11 Multiple Choice (Single Answer)

The plate of earthing is surrounded by a mixture of _______to make a good earth connection. Fill in the blank. 

  1. Salt
  2. Charcoal
  3. Both
  4. None of the above
Question 12 Multiple Choice (Single Answer)

Earthing is also knows as

  1. Fusing
  2. Grounding
  3. Pluggings
  4. All
Question 13 Multiple Choice (Single Answer)
State whether true or false:
Earthing of electric appliance prevents electric shock.
  1. True
  2. False
Question 14 Multiple Choice (Single Answer)

If a person touches the appliance, his body provides a path for current to flow to earth which is at ............ potential.

  1. Infinite
  2. low
  3. high
  4. zero
Question 15 Multiple Choice (Single Answer)

Why mostly all electrical home appliances like refrigerator, toaster etc. are provided with a wire having green insulation?

  1. Earth wire is the insulated green coloured copper wire which is connected to a metal plate deep inside the earth near the house.
  2. It is used as a safety measure.
  3. both
  4. none
Question 16 Multiple Choice (Single Answer)

Many electrical appliances are earthed or grounded. Reason behind this

  1. to make electricity balance
  2. due to "g"
  3. protection against shock
  4. all
Question 17 Multiple Choice (Single Answer)
State whether true or false.
In electrical circuits the earth is considered to be at infinite potential.
  1. True
  2. False
Question 18 Multiple Choice (Single Answer)

The earth wire is connected to the outer casing of the appliance because ___________.

  1. The earth wire can prevent the fuse from blowing
  2. The earth wire can carry leaked charges to the ground
  3. The outer casing is an insulator and therefore it can store charges
  4. The earth wire can conduct the heat away from the appliance
Question 19 Multiple Choice (Single Answer)

The earth wire is connected to the outer casing of the appliance because ...................  .

  1. The earth wire can prevent the fuse from blowing
  2. The earth wire can carry leaked charges to the ground
  3. The outer casing is an insulator and therefore it can store charges
  4. The earth wire can conduct the heat away from the appliance
Question 20 Multiple Choice (Single Answer)

Ohm's law in vector form is :

  1. $V=I.R$
  2. $\overrightarrow { J } =\sigma \overrightarrow { E } $
  3. $\overrightarrow { J } =\rho \overrightarrow { E } $
  4. $\overrightarrow { E } =\sigma \overrightarrow { J } $
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