What is the SI base unit used to measure time?
ADay
BHour
CSecond
DMinute
Archive
Archives: MCQs
What term describes sound waves with a frequency lower than the typical lower limit of human hearing, generally below about 20 hertz?
AUltrasonic sound
BResonant sound
CInfrasound
DWhite noise only
What term describes sound waves with a frequency higher than the upper limit of typical human hearing, generally above about 20,000 hertz?
AUltrasonic sound
BResonant sound
CInfrasound
DAmplified sound only
Bats and dolphins are well known for using which biological navigation technique, involving emitting sound and interpreting the returning echoes?
AEcholocation
BOsmoregulation only
CPhotosynthesis
DMagnetoreception
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
In optics, what is the key difference between a real image and a virtual image?
AThere is no meaningful difference between the two types of images
BA real image can be projected onto a screen, while a virtual image cannot
CA virtual image can be projected onto a screen, while a real image cannot
DReal images only occur in mirrors, while virtual images only occur in lenses
What is the primary function of a glass prism in basic optics experiments?
ATo block ultraviolet radiation only
BTo split white light into its component colors through refraction
CTo absorb all visible light completely
DTo generate new colors of light that don't already exist in sunlight
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
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 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