ASNT VT LEVEL II ACTUAL EXAM PAPER 2026
QUESTIONS ANSWERS GRADED A+
◉ Blackbody. Answer: A hypothetical object that absorbs all of the
radiation that strikes it. It also emits radiation at a maximum rate for
its given temperature.
◉ Spectral Emissivity. Answer: The ratio of the spectral radiance of a
source to that of a black-body radiator at the same λ and T
◉ Additive Colors of Light. Answer: red, green, blue
◉ Subtractive Colors of Light. Answer: magenta, cyan, yellow
◉ 4 Types of Light. Answer: Incandescent, Luminescent, Polarized,
Coherent
◉ Metastable State. Answer: An electron gets excited up to the next
orbit up, then pauses
◉ Coherent Light. Answer: Light of only one wavelength that travels
with its crests and troughs aligned, cannot be monochromatic.
,◉ Incandescent Light. Answer: light generated by heating a piece of
metal until it glows, thermal excitation of atoms/molecules.
◉ Luminescent Light. Answer: light given off by objects that have
not been heated, a single valence electron.
◉ Polarized Light. Answer: light with waves that vibrate in only one
plane, one direction
◉ Main Properties of Light. Answer: Wavelength, frequency,
reflection, refraction
◉ Refraction of light. Answer: The bending of light as it passes from
one medium to another including direction and velocity.
◉ Reflection of Light. Answer: a light wave strikes an object and
bounces off, angle of reflection matches angle of incidence
◉ angle of incidence. Answer: The angle at which incoming light rays
approaches a surface.
◉ radiometry. Answer: the measurement of electromagnetic
radiation (radiant energy)
, ◉ Photometry. Answer: measuring intensity of light by visual
comparison to the response of the human eye
◉ Human Eye. Answer: The most common photometric device
◉ Luminous Flux. Answer: the rate at which light energy is emitted
from a luminous source
◉ Luminance. Answer: measure of the luminous flux at a given
surface where the angle of incidence or refraction is considered
◉ 3 Categories of Luminance and Illuminance Photometers. Answer:
Visual Comparison Devices, Photoelectric Devices, and
Photoemissive Tube Devices
◉ Photoelectric Devices. Answer: illuminance photometers, typically
photovoltaic cells and photoconductive cells
◉ Photovoltaic Cell. Answer: Photoelectric Device that depends on
the generation of electricity when a photon of light is absorbed by a
metal plate that is coated with two layers of semiconductors.
Typically made of silicon or selenium.
QUESTIONS ANSWERS GRADED A+
◉ Blackbody. Answer: A hypothetical object that absorbs all of the
radiation that strikes it. It also emits radiation at a maximum rate for
its given temperature.
◉ Spectral Emissivity. Answer: The ratio of the spectral radiance of a
source to that of a black-body radiator at the same λ and T
◉ Additive Colors of Light. Answer: red, green, blue
◉ Subtractive Colors of Light. Answer: magenta, cyan, yellow
◉ 4 Types of Light. Answer: Incandescent, Luminescent, Polarized,
Coherent
◉ Metastable State. Answer: An electron gets excited up to the next
orbit up, then pauses
◉ Coherent Light. Answer: Light of only one wavelength that travels
with its crests and troughs aligned, cannot be monochromatic.
,◉ Incandescent Light. Answer: light generated by heating a piece of
metal until it glows, thermal excitation of atoms/molecules.
◉ Luminescent Light. Answer: light given off by objects that have
not been heated, a single valence electron.
◉ Polarized Light. Answer: light with waves that vibrate in only one
plane, one direction
◉ Main Properties of Light. Answer: Wavelength, frequency,
reflection, refraction
◉ Refraction of light. Answer: The bending of light as it passes from
one medium to another including direction and velocity.
◉ Reflection of Light. Answer: a light wave strikes an object and
bounces off, angle of reflection matches angle of incidence
◉ angle of incidence. Answer: The angle at which incoming light rays
approaches a surface.
◉ radiometry. Answer: the measurement of electromagnetic
radiation (radiant energy)
, ◉ Photometry. Answer: measuring intensity of light by visual
comparison to the response of the human eye
◉ Human Eye. Answer: The most common photometric device
◉ Luminous Flux. Answer: the rate at which light energy is emitted
from a luminous source
◉ Luminance. Answer: measure of the luminous flux at a given
surface where the angle of incidence or refraction is considered
◉ 3 Categories of Luminance and Illuminance Photometers. Answer:
Visual Comparison Devices, Photoelectric Devices, and
Photoemissive Tube Devices
◉ Photoelectric Devices. Answer: illuminance photometers, typically
photovoltaic cells and photoconductive cells
◉ Photovoltaic Cell. Answer: Photoelectric Device that depends on
the generation of electricity when a photon of light is absorbed by a
metal plate that is coated with two layers of semiconductors.
Typically made of silicon or selenium.
