Explanation

A step-up transformer increases the voltage of the input signal, resulting in a higher voltage output.

This is achieved by having more turns in the secondary coil than in the primary coil.

Explanation

DNA (Deoxyribonucleic acid) is the primary molecule that encodes genetic information in cells.

It is a long, double-stranded helix made up of nucleotides, which are the building blocks of genetic information.

Explanation

A respiratory surface, such as the alveoli in lungs or the surface of gills, possesses the following properties:

• Thin: allows for efficient gas exchange
• Wet: facilitates the exchange of gases between the surface and the surrounding environment
• Permeable: allows gases to pass through the surface
• Very large: provides a large surface area for gas exchange to occur

Explanation

Bromine (Br2) is the only halogen that exists in a liquid state at room temperature.

It is a reddish-brown liquid with a melting point of -7.2°C or 19°F.

Explanation

Hydroiodic acid (HI) is the strongest acid.

The acidity of hydrohalic acids increases down the group in the periodic table.

Due to the decreasing bond strength and increasing bond length.

Explanation

• Communication satellites are used for telecommunication.
• Including telephone communication, internet connectivity, and television broadcasting, enabling global communication networks.

Explanation

The current produced in a coil due to electromagnetic induction is called an induced current.

The induced current can be positive or negative depending on the direction of the change in magnetic flux and the orientation of the coil

However, the term "induced current" is used to refer to the current that flows

As a result of electromagnetic induction, regardless of its direction being positive or negative

Explanation

The two unpaired facial bones are the mandible and the vomer.

Mandible:

The mandible, commonly known as the jawbone, is the largest and strongest bone of the face.

It forms the lower jaw and holds the lower teeth in place.

It is the only movable bone of the skull.

Vomer:

The vomer is a thin, flat bone that forms part of the nasal septum, which divides the nasal cavity into left and right sides.

It is located inferiorly within the nasal cavity.

Explanation

The increase in the rate of reaction due to an increase in temperature is due to two main factors:

• Increased energy: As temperature increases, the particles gain kinetic energy, allowing them to move faster and collide more frequently.
• Successful collisions: The increased energy also leads to a greater likelihood of successful collisions, where the particles have sufficient energy to overcome the activation energy barrier and react.

Explanation

• Covalent network crystals, also known as giant covalent structures, are solids in which each atom is covalently bonded to its neighbors, forming a continuous network of chemical bonds.
• Examples include diamond, graphite, and silicon carbide.
• These materials have very high melting points due to the strong covalent bonds that hold them together.