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Ohm’s Law expresses the relationship between voltage, current, and resistance in an electrical circuit using which formula?
AV equals I plus R
BV equals I minus R
CV equals I divided by R
DV equals I multiplied by R
The octane rating of petrol is primarily a measure of what characteristic of the fuel?
AIts overall color
BIts total weight per liter
CIts exact price per liter
DIts resistance to premature ignition, or engine knocking, under compression
An electric doorbell commonly produces its ringing sound using which basic electromagnetic working principle?
AA chemical reaction producing an audible pop
BA small internal combustion engine
CAn electromagnet repeatedly attracting a metal striker toward a bell or chime
DA rotating magnet generating sound waves directly
Unlike petrol engines, which use a spark plug to ignite fuel, diesel engines typically ignite their fuel through which method?
AAn external electric heating coil only
BThe heat generated by compressing air to a very high pressure
CA spark plug identical to petrol engines
DA chemical catalyst added to the fuel
What is an electromagnet, commonly used in devices like electric bells, motors, and industrial cranes?
AA temporary magnet created when electric current flows through a coil of wire, often wrapped around an iron core
BA magnet that only works underwater
CA magnet made purely from a rare naturally occurring mineral
DA permanent magnet that never loses its magnetism
Which metallic element is unique among metals for being in a liquid state at normal room temperature?
AAluminum
BMercury
CSodium
DIron
How does the location of Earth’s magnetic poles compare to the location of its geographic poles?
AThey are located at exactly the same points
BThey are located at noticeably different points and are not perfectly aligned
CEarth does not actually have magnetic poles
DThe magnetic poles are located at Earth's equator
Which non-metallic element is notable for being in a liquid state at normal room temperature, unlike most other non-metals?
ASulfur
BChlorine
CIodine
DBromine