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Photometry MCQ Questions and Answers. We covered all the Photometry MCQ Questions and Answers in this post so that you can practice well for the exam.
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Photometry MCQ Questions and Answers for Students
Luminous flux cannot be detected visually when measured in
a. Ergs per second
b. Lumen
c. Lumen per watt
d. None of these
Option a – Ergs per second
Measuring luminous power in ergs/second is not visually possible because
a. Human eye sensitivity differs for various colors
b. Human eye sensitivity is constant for all colors
c. Human eye sensitivity changes for the same color
d. None of these
Option a – Human eye sensitivity differs for various colors
When normal lines are drawn from the surface of a sphere to its center forming a cone, the enclosed angle is known as
a. Angle of a semicircle
b. Major segment angle
c. Solid angle
d. Minor segment angle
Option c – Solid angle
A solid angle is defined as the
a. Ratio of the area on the sphere’s surface to the square of its radius
b. Sum of the surface area and square of the radius
c. Difference between surface area and square of the radius
d. None of these
Option a – Ratio of the area on the sphere’s surface to the square of its radius
Light emitted by a point source like a candle travels as
a. Cylindrical waves
b. Spherical waves
c. Plane waves
d. None of these
Option b – Spherical waves
The unit used to measure solid angle is
a. Radian
b. Steradian
c. Degree
d. Minute
Option b – Steradian
For a sphere with a radius of one unit, a surface area of one square unit at the center subtends a solid angle of
a. 1 steradian
b. 2 steradians
c. 3 steradians
d. 4 steradians
Option a – 1 steradian
The brightness of a light source perceived by the human eye is described as
a. Luminosity
b. Luminous intensity
c. Illuminating power
d. b and c
Option d – b and c
Luminous flux through a unit solid angle from a source is known as
a. Luminous intensity
b. Illuminating power
c. Luminosity
d. a and b
Option d – a and b
The correct unit for measuring luminous intensity is
a. Lumen
b. Candela
c. Lumen per watt
d. None of these
Option b – Candela
The SI unit of luminous intensity is
a. Candela
b. Lumen
c. Lumen per watt
d. Erg per second
Option a – Candela
A blackbody is considered a perfect
a. Emitter
b. Absorber
c. Both a and b
d. None of these
Option c – Both a and b
Candela is defined based on the light emitted per unit solid angle by
a. One lumen of light
b. One erg per second
c. A blackbody area of 1/60 square cm
d. One unit of power
Option c – A blackbody area of 1/60 square cm
Luminous flux from a source is expressed in
a. Lumen
b. Candela
c. Lumen per watt
d. Erg per second
Option a – Lumen
The energy released per second by a light source in a unit solid angle is
a. Candela
b. Lumen
c. Erg per second
d. Luminosity
Option b – Lumen
For a fixed source, the quantity that remains unchanged is
a. Luminous intensity
b. Luminosity
c. Luminous flux
d. All of these
Option a – Luminous intensity
Which of the following are not visually measurable in ergs/second?
a. Luminous flux
b. Luminous intensity
c. Luminosity
d. a and b
Option d – a and b
Light can be described as
a. At rest
b. Flowing energy
c. Flowing matter
d. Matter at rest
Option b – Flowing energy
Light is produced by
a. Non-luminous objects
b. Self-luminous sources
c. Any kind of matter
d. All of these
Option b – Self-luminous sources
The type of energy that causes the human eye to perceive vision is called
a. Light
b. Sound
c. Heat
d. Electricity
Option a – Light
The term “light” refers to which part of the electromagnetic spectrum?
a. Infrared
b. Visible
c. Ultraviolet
d. None of these
Option b – Visible
A source of light can emit energy in which part of the electromagnetic spectrum?
a. Visible
b. Infrared
c. Violet
d. All of these
Option d – All of these
Which property represents how much visible light is present in the total radiant energy from a source?
a. Brightness
b. Luminous intensity
c. a and b
d. None of these
Option c – a and b
The total radiant energy from a source per unit time is called
a. Luminosity
b. Luminous flux
c. Luminous intensity
d. None of these
Option c – Luminous intensity
The branch of science that compares brightness levels of two light sources is called
a. Photometry
b. Visible spectroscopy
c. Visual photometry
d. All of these
Option c – Visual photometry
The science of measuring light brightness using defined standards is known as
a. Visible spectrum analysis
b. Photometer
c. Visual photometry
d. None of these
Option b – Photometer
The total light energy from a source measured in ergs per second is called
a. Luminous flux
b. Light flux
c. Luminosity
d. a and b
Option d – a and b
The amount of light emitted by a source depends on
a. Luminosity
b. Illuminating power
c. Luminous intensity
d. b and c
Option d – b and c
We covered all the photometry MCQ questions and answers above in this post for free so that you can practice well for the exam.
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