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With reference to street-lighting, how do Mercury vapour lamps differ from LED lamps? 1. Mercury vapour lamps use a fraction of the energy used in the case of LED lamps. 2. LEDs have a lower radiance than mercury arc lamps.  3. Mercury lamps are eco-friendly as they require low voltages than LED lamps to operate. Select the correct answer using the code given below.
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.
In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as
How do Mercury vapour lamps differ from LED lamps? 1. LEDs have a lower radiance than mercury arc lamps.  2. Mercury lamps are eco-friendly as they require low voltages than LED lamps to operate. Select the correct answer using the code given below.
In mercury arc rectifier, mercury is used as
The voltage drop at anode, in a mercury arc rectifier is due to
The cathdde voltage drop, in a mercury arc rectifier, is due to
The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following
Name the system, where water falls drop by drop just at the position of roots and water is delivered at or near the root zone of plants, drop by drop.
Capillary rise of mercury in a small diameter tube is proportional of (where, d = mercury of the rube, σ = surface tension of mercury)