Explanation

• The electricity from a cell (such as a battery) is Direct Current (DC).
• It is the flow of electric charge in one direction only, without changing direction.
• This is the type of current used in electronic devices such as smartphones, laptops, and televisions.

Explanation

The center of gravity of an object is where we can consider all of the weight of the object to be concentrated.

This is a useful concept in physics and engineering.

Explanation

The type of transpiration occurring through special openings in plant stems is called lenticular transpiration.

These openings, known as lenticels, are small pores in the bark of woody stems and allow for gas exchange and water vapor loss. 

Explanation

Most proteins are made up of 20 different amino acids.

These 20 amino acids are commonly referred to as the standard or proteinogenic amino acids.

While other amino acids exist, they are not typically found in the primary structure of proteins that make up most living organisms.

Explanation

Elements are placed in order on the periodic table based on their atomic number, how many protons they have.

In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.

Explanation

Iron oxide is a chemical compound  of oxygen and iron and is most commonly found in the earth's crust in the

form of hematite (Fe2O3). It also exists in the form of

magnetite (Fe3O4).

Explanation

Cadmium rods are inserted in nuclear reacter to absorb the extra nucleons.

Cadmium has a high thermal neutron absorption cross section.

Therefore, cadmium rods will absorb neutrons, making them unavailable to cause fission.

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Explanation

Sound travels at approximately 1,100 feet per second (766 miles per hour).

Radio waves travel at the speed of light, which is approximately 186,000 miles per second.

Explanation

answer: [c] Mouth to mouth resuscitation

• performing CPR which intended checking the airway and doing mouth-to-mouth resuscitation in addition to chest compressions are the first aid in the course of cardiac failures.
• 
  specialists now propose chest compressions by myself can maintain the coronary heart pumping and maintain blood go with the flow for a couple of minutes till emergency workers arrive.

Explanation

Answer:

A

In the former, it is violent and rapid creation with release of much heat energy while in the latter it is a generally slow reaction with release of less heat energy