Explanation

The force exerted by the atmosphere on the surface of the water is equal to the pressure multiplied by the area of the surface:

Force = Pressure x Area

= 100 kPa x (2 m x 1 m)

= 100,000 Pa x 2 m^2

= 200,000 N

= 200 kN

Explanation

• Phenylamine, also known as aniline, is a molecule that consists of a benzene ring attached to an amino group (-NH2).
• In this molecule, one of the three p-orbitals on the nitrogen atom overlaps with the pi bonding system in the benzene ring, forming a delocalized pi system.

Explanation

At constant temperature, the resistance (R) of a conductor is inversely related to its cross-sectional area (A). This is expressed by the formula: R = ρ × L / A

where:

• R is the resistance
• ρ (rho) is the resistivity of the material
• L is the length of the conductor
• A is the cross-sectional area

As the cross-sectional area (A) increases, the resistance (R) decreases, and vice versa. This is why thicker wires have lower resistance than thinner wires.

Explanation

• The resistance of a filament lamp increases at higher voltages.
• The increase in voltage leads to an increase in current, which heats up the filament and increases the resistance.
• The increased temperature causes the atoms in the filament to vibrate more, making it more difficult for electrons to pass through and increasing the resistance.

Explanation

• DOS uses letters of the alphabet (A-Z) to designate disk drives, and it can address up to 26 disk drives.
• This means that DOS can recognize and assign drive letters from A to Z, allowing for a maximum of 26 disk drives to be connected to a system.

Explanation

• Ribosomes are the site of protein synthesis and are present in all living cells, including bacteria.
• They are not specific to the bacterial cell and are not typically used as antigens for vaccine development or immune response.

Explanation

Surplus red blood cells, needed to meet an emergency, are mainly stored in the spleen.

Explanation

The percentage by mass of an element in a compound is calculated using the formula:

Percentage by mass = (Mass of element in 1 mole of compound / Molar mass of compound) x 100

Explanation

Ebola virus spreads through:

• Direct contact with infected blood, sweat, saliva, mucus, and other bodily fluids
• Contact with contaminated objects, such as needles, medical equipment, and clothing
• Contact with infected animals, such as fruit bats and nonhuman primates
• Contact with an infected person's body after death

Explanation

The Unix shell is a:

• Scripting language: It can execute scripts containing multiple commands.
• Interpreter language: It interprets commands one at a time, without the need for compilation.