Explanation

Direct current is produced when electrons flow constantly in one direction.

It's abbreviated as "DC".

Since direct current flows in one direction only, its electrical pressure or voltage is always oriented in one direction, or "polarity".

ND25-2-2023

Explanation

Magnetic Resonance Imaging (MRI) is a non-invasive imaging technology that produces three-dimensional detailed anatomical images.

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VU CBT FIA PAPER 13-12-2021

ND25-2-2023

Explanation

Thermochemistry is the study of chemical reactions and the energy changes that involve heat.

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RY24012023

Explanation

The burning of substances in air or oxygen on heating, with the release of a large amount of heat energy and light energy, is called combustion

while

In conduction, heat transfer occurs between objects by direct contact.

In convection, the heat transfer takes within the fluid

Condensation is the process by which water vapor in the air is changed into liquid water; it's the opposite of evaporation

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ND22-1-2023

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RY24012023

Explanation

Convex lenses are also known as converging lenses since the rays converge after falling on the convex lens.

The concave lens are known as diverging lenses, as the rays diverge after falling on the concave lens.

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RY24012023

Explanation

When light shines on a photovoltaic (PV) cell – also called a solar cell – that light may be reflected, absorbed, or pass right through the cell.

The PV cell is composed of semiconductor material; the “semi” means that it can conduct electricity better than an insulator but not as well as a good conductor like a metal.

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RY24012023

Explanation

When Galileo pointed his telescope at Jupiter, the largest planet in our solar system, he made a startling discovery.

The planet had four "stars" surrounding it.

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RY24012023

Explanation

When water cools from 4°C to 0°C, ice crystals begin to form 

When water freezes, the water molecules form a lattice that increases the volume.

As a result, the density decreases

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ND22-1-2023

Explanation

Telescope: It is a device used to see distant objects.

The word telescope was coined in 1611 by the Greek mathematician Giovanni Demisiani 

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ND22-1-2023

Explanation

The breakdown of CFCs releases chlorine, which then acts as a catalyst for the destruction of the ozone layer.

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ND22-1-2023