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In optics, what term describes the distance between a lens or curved mirror’s optical center and the point where parallel light rays converge, called the focal point?
ARefractive index only
BFocal length
CAmplitude
DWavelength
Which inventor and engineer made major contributions to the development of alternating current (AC) electrical systems, which remain widely used in power grids today?
ANikola Tesla
BCharles Darwin
CLouis Pasteur
DGregor Mendel
What is the key practical difference between baking powder and baking soda, both commonly used as leavening agents in baking?
ABaking powder already contains an acidic ingredient, so it doesn't require an additional acid to activate it, unlike baking soda alone
BBaking soda always requires more of it to achieve the same rising effect as baking powder
CBaking powder is only used for savory dishes, never in sweet baked goods
DThere is no meaningful difference between the two products
Nitric acid, a strong and highly corrosive acid, is widely used industrially in the production of which common agricultural product?
ATable salt
BVegetable oil
CSugar
DNitrogen-based fertilizers
Which instrument is specifically designed to detect and measure very small electric currents?
AOhmmeter
BGalvanometer
CVoltmeter
DAmmeter
Which instrument is used to directly measure the electric current flowing through a circuit?
AThermometer
BAmmeter
CVoltmeter
DBarometer
A periscope, historically used in submarines, allows a viewer to see over or around obstacles primarily using which optical principle?
ADiffraction through a narrow slit
BReflection of light off angled mirrors or prisms
CAbsorption of light by colored filters
DRefraction through a single lens
What is the basic function of a telescope, a device widely used in astronomy?
ATo measure the distance to nearby objects only
BTo convert sound waves into visible light
CTo gather light and magnify distant objects, making them appear closer and more detailed
DTo magnify very small, nearby objects
What is the basic function of a microscope, a device widely used in laboratories and scientific research?
ATo detect radio waves
BTo magnify very small objects that are otherwise difficult or impossible to see with the naked eye
CTo measure atmospheric pressure
DTo magnify distant objects, such as stars
What is the basic function of a traditional camera, whether film-based or digital?
ATo generate its own light source only
BTo capture and record an image of a scene using a lens and a light-sensitive surface
CTo measure the temperature of an object being photographed
DTo magnify distant sounds