- AGreen, Red, black.
- BRed, Green, Black.
- CRed, Black, Green.
- DNone of the above.
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.
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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 |
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 |
Referring to the figure below, the effective resistance of the network is
|
(a) 2 r |
(b) 4 r |
(c) 10 r |
(d) 5r/2 |