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Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it
In diaphragm pump the piston assembly is replaced by a diaphragm and housing; these pumps are often powered by ________ and occur as double diaphragm pumps.
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.
Diaphragm used in diaphragm cell process is ______________
Capillary rise of mercury in a small diameter tube is proportional of (where, d = mercury of the rube, σ = surface tension of mercury)
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.
Which of the following statement is true regarding the extraction process of mercury? 1. Cinnabar (HgS), an ore of mercury is first reacted with water and it converts into mercuric oxide (HgO). 2. Mercuric oxide is then reduced to mercury by heating.
Reading the following statements carefully and choose the correct option.  Assertion (A) : Mercury is used in thermometers.  Reasoning 1 (R1) : Mercury is a good conductor of heat.  Reasoning 2 (R2) : Mercury expands uniformly when heated. 
The right limb of simple U-tube manometer containing mercury is open to atmosphere while the left limb is connected to a pipe in which fluid of specific gravity 0.9 is flowing. The centre of the pipe is 12 cm below the level of mercury in the right limb. Find the pressure of fluid in the pipe if the difference of mercury level in two limbs is 20 cm.