Which everyday item uses the principle of total internal reflection to transmit data as light signals?

Which gas is used to fill incandescent light bulb to prevent the filament from burning?

Which everyday process is used when a doctor listens to heartbeats through a stethoscope?

Which phenomenon causes a needle to deflect when placed near a current-carrying wire?

Which vitamin is produced when ultraviolet light acts on cholesterol in the skin?

Which everyday material is used as an X-ray absorber to protect the body during medical scans?

Which phenomenon explains why a straw placed in a drink allows liquid to be sucked upward?

Which sense organ contains the olfactory receptors responsible for detecting smells?

Which common ailment is caused by the Helicobacter pylori bacterium?

Which common substance has the chemical formula H2O2?

Which process allows a submarine to sink or rise by adjusting water in ballast tanks?