Explanation

Zinc is an essential trace element, meaning it is required by the body in small amounts for various physiological processes, such as immune function, wound healing, protein synthesis, and DNA replication.

Explanation

• The pH value of pure water at room temperature is 7.
• This is because pure water is neutral, meaning the concentration of hydrogen (H3O+) and hydroxide (OH-) ions are equal.

Explanation

• When a gas is ionized, it means that the gas is converted into a state of matter known as plasma, where the gas is broken down into ions and free electrons.
• This is typically achieved through the application of high temperatures, high energies, or strong electrical fields.

Explanation

By joining two hemispheres along their bases we have a sphere.

Total surface area of sphere = 4×πr2

Explanation

• At the end of a communication system, such as a radio receiver or a phone, the signal is converted from radio waves (electromagnetic waves) to sound waves, which are perceived as sound by the human ear.
• This conversion is done through a speaker or earphone, which converts the electrical signal into sound waves.

Explanation

• When installing PCI NICs (Network Interface Cards), you can check the IRQ (Interrupt Request) availability by looking at the jumper settings.
• IRQs are essential resources that devices use to communicate with the CPU.
• Each device requires a unique IRQ to function properly without conflicts.

Explanation

The extraction of a cube root of a given number is a binary operation.

Explanation

• High-speed electrons from particle detectors are used to determine the diameter of atomic nuclei through techniques such as electron scattering or electron microscopy.
• By measuring the scattering pattern or the diffraction pattern of the electrons, researchers can infer the size and shape of the atomic nucleus, including its diameter.

Explanation

• Communication with MySQL is established through network calls.
• MySQL is a client-server system, where clients communicate with the server over a network connection.
• This communication involves sending queries, commands, and receiving responses over the network.

Explanation

All of the options listed can be transmitted via infectious droplets:

• Rubella (German measles) is an airborne disease spread through droplets when an infected person talks, coughs, or sneezes.
• Common cold is a viral infection spread through airborne droplets when an infected person talks, coughs, or sneezes.
• Influenza (flu) is also an airborne disease spread through droplets when an infected person talks, coughs, or sneezes.

Infectious droplets are a common mode of transmission for many respiratory pathogens, including viruses and bacteria.

So, none of the above options are incorrect, and the correct answer is indeed "None of the above".