Which everyday device changes alternating current from power lines to the lower voltages suitable for homes?

Which unit measures the loudness or intensity of sound?

What is the approximate speed of light in a vacuum?

Which unit measures the frequency of sound waves typically expressed as cycles per second?

Which phenomenon is responsible for the formation of a shadow?

Which human body system is primarily responsible for fighting infections and diseases?

Which household disinfectant chemical is commonly used to purify drinking water in small quantities?

Which common kitchen equipment uses microwave radiation to heat food by exciting water molecules?

Which part of the human body regulates temperature through sweating and blood vessel dilation?

Which planet in the solar system rotates on its side with an axial tilt of about 98 degrees?

Which everyday phenomenon explains how a guitar produces different musical notes when different strings are plucked?