MCQ
The color coding of  earth, live and neutral wire respectively is:
  • A
    Green, Red, black.
  • B
    Red, Green, Black.
  • C
    Red, Black, Green.
  • D
    None of the above.

Answer

  1. Green, Red, black.

Explanation:

The electric power line enters our house through three wires- namely the live wire, the neutral wire and the earth wire. To avoid confusion we follow a colour code for insulating these wires. The red wire is the live wire, and the black wire is neutral. The earth wire is given green plastic insulation. The colour coding of wires is green for earth red for live and black for neutral.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Which of the following is a widely used variety of commercial resistor?
Two wires A and B are made of same material. The wore A has a length l and diameter r while the wire B has a length 2l and diameter $\frac{\text{r}}{2}$. If the two wires are stretched by the same force, the elongation in A divided by the elongation in 8 is:

  1. $\frac{1}{8}$

  2. $\frac{1}{4}$

  3. $4$

  4. $8$

The amplification factor of a triode valve is 15. If the grid voltage is changed by 0.3 volt the change in plate voltage in order to keep the plate current constant (in volt) is

(a) 0.02

(b) 0.002

(c) 4.5

(d) 5.0

Number of electrons in one coulomb of charge will be

(a) 5.46  

(b)  6.25

(c) 1.6  

(d) 9  

The focal length of a lens of refractive index $\mu$ is f. If the lens is immersed in a liquid of refractive index $\mu$ then the focal length of lens is:

An electron enters a magnetic field whose direction is perpendicular to the velocity of the electron. Then

(a) The speed of the electron will increase

(b) The speed of the electron will decrease

(c) The speed of the electron will remain the same

(d) The velocity of the electron will remain the same

The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from:

If the energy released in the fission of one nucleus is 200 MeV. Then the number of nuclei required per second in a power plant of 16 kW will be

(a) 0.5  

(b) 0.5  

(c) 5  

(d) 5  

An AC source rated 100V (rms) supplies a current of 10A (rms) to a circuit. The average power delivered by the source:
  1. Must be 1000W.
  2. May be 1000W.
  3. May be greater than 1000W.
  4. May be less than 1000W.

Referring to the figure below, the effective resistance of the network is

(a) 2 r

(b) 4 r

(c) 10 r

(d) 5r/2