Explanation

Answer:

Fluorescent lamps consist of glass tubes filled with a mixture of argon and mercury vapor. The metal electrodes on both ends are coated with an alkaline earth oxide that easily donates electrons.

Explanation

Answer:

C

Nuclear power reactors are operated at low temperatures and consequently with lower efficiency because  The walls of nuclear reactors cannot withstand high temperature

Explanation

Answer:

B

urea 

 Urea with 46% N has the highest nitrogen content of all solid fertilizers. UAN solutions such as B. 28% and 32% liquid nitrogen are composed of various forms of nitrogen.

Explanation

Hypocenter is the point beneath the Earth’s surface where the vibrations of an earthquake originates and which corresponds to the location where the motion on a fault surface starts.

Explanation

tungsten is also among the heaviest metals.

Its electrical conductivity at 0 °C is about 28% of that of silver which itself has the highest conductivity of all metals.

Tungsten has the chemical symbol W

and is element 74 of the periodic table.

while 

Silver is the first-best conductor of heat.

Copper is the second-best conductor of heat.****

ND10-1-2023

Explanation

The most stable metals, such as gold and platinum, do not corrode easily

because they do not lose electrons easily.

while

Metals placed higher in the reactivity series, such as iron, zinc, etc., get corroded very easily

Explanation

Limestone is a Sedimentary Rock, Stratified Rock, Aqueous Rock.

Limestone consists of calcium carbonate,

which has the chemical formula CaCO3.

Calcium carbonate is a chemical compound

It is a common substance found in rocks as the minerals calcite

RK11-12-22

Explanation

A galvanometer is an instrument that can detect and measure small amounts of current in an electrical circuit

Explanation

 Conductors

Atoms of metallic elements are characterized by the presence of valence electrons, which are electrons in the outer shell of free-moving atoms. It is these ""free electrons" that allow the metal to conduct electricity.

Explanation

nitrogen 

 Therefore, the majority of the atmosphere  is nitrogen, which accounts for 78%.