Question 1

Mirrored glass reflects 99 percent of the light that strikes it.

Accepted Answer

Most mirrored glass reflects about 80% to 90% of the light that strikes it, not 99%. The exact percentage can vary based on the type of mirror and its coating.

Question 2

What unit of measurement is used to measure the amount of illumination on a surface?&#10;A) lumen&#10;B) candlepower&#10;C) watt&#10;D) foot-candle

Accepted Answer

Foot-candle is the unit of measurement used to measure the amount of illumination on a surface.

Question 3

A(n) ____, highly polished, bright material reflects most of the light that strikes it.&#10;A) translucent&#10;B) colored&#10;C) thin&#10;D) opaque

Accepted Answer

Opaque materials do not allow light to pass through, and when they are highly polished and bright, they reflect most of the light that strikes them.

Question 4

A light intensity curve can be used to show that the amount of illumination is independent of the angle from the source.

Accepted Answer

A light intensity curve typically shows that the amount of illumination decreases as the angle from the source increases, due to the inverse square law of light intensity.

Question 5

A glow switch is also called a(n) ____.&#10;A) preheat&#10;B) energy saver&#10;C) heater&#10;D) starter

Accepted Answer

A glow switch is also called a starter, which is used in fluorescent lighting systems to initiate the lamp.

Question 6

____ lighting fixtures transmit 60 percent to 90 percent of the light upward.&#10;A) Indirect&#10;B) Semi-direct&#10;C) Semi-indirect&#10;D) General diffusing

Accepted Answer

Semi-indirect lighting fixtures are designed to transmit 60 percent to 90 percent of the light upward, providing a softer and more diffused lighting effect.

Question 7

Which law is used to calculate the intensity of light at a given distance from a source?&#10;A) square law&#10;B) inverse square law&#10;C) proportional law&#10;D) spherical law

Accepted Answer

The inverse square law is used to calculate the intensity of light at a given distance from a source, stating that the intensity is inversely proportional to the square of the distance from the source.

Question 8

The most common type of electric discharge lamp is the ____ lamp.&#10;A) incandescent&#10;B) high energy discharge&#10;C) fluorescent&#10;D) commercial

Accepted Answer

Fluorescent lamps are the most common type of electric discharge lamps, widely used in offices, homes, and many commercial spaces due to their efficiency and long life compared to incandescent lamps.

Question 9

What is the approximate percentage of light reflected by a black colored surface?&#10;A) 3 percent&#10;B) 10 percent&#10;C) 50 percent&#10;D) 80 percent

Accepted Answer

Black surfaces are known for absorbing most of the light that falls on them, reflecting only a small fraction. Approximately 3 percent reflection is a characteristic of black surfaces, making option A correct.

Question 10

A luminaire is&#160; _____.&#10;A) a complete lighting unit&#10;B) a method of lighting&#10;C) the power source for a lighting unit&#10;D) the lamp portion of a lighting unit

Accepted Answer

A luminaire is a complete lighting unit, including the lamp (light source), the fixture (housing that holds the lamp), and any other parts that distribute the light, position and protect the lamp, and connect the lamp to the power supply.

Question 11

Candlepower and lumens are units of measurement of light emitted from a source.

Accepted Answer

The answer of Candlepower and lumens are units of measurement...

Question 12

When considering multiple light sources, the amount of illumination at a given point is the sum of the light rays coming from all the units.

Accepted Answer

The answer of When considering multiple light sources, the amount...

Question 13

The ratio between the light that reaches the working plane and the light produced by the luminaire provides a constant known as the ____ .&#10;A) coefficient of utilization&#10;B) efficiency&#10;C) maintenance constant&#10;D) usage coefficient

Accepted Answer

The answer of The ratio between the light that reaches...

Question 14

When lighting is so bright that it causes eye discomfort, it is said to produce ____.&#10;A) vapor&#10;B) glare&#10;C) intensity&#10;D) absorbed light

Accepted Answer

The answer of When lighting is so bright that it...

Question 15

One type of luminaire is indirect.

Accepted Answer

The answer of One type of luminaire is indirect....

Deck 14: Lighting