Question 1

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

Accepted Answer

When lighting is too bright and causes eye discomfort, it produces glare. Reflected light refers to light that is bounced back off a surface. Transmitted light refers to light that passes through a medium, such as a window. Absorbed light refers to light that is absorbed by a material and not reflected or transmitted.

Question 2

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 states that the intensity of light is inversely proportional to the square of the distance from the source. This law is used to calculate the intensity of light at a given distance from a source.

Question 3

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

Accepted Answer

Candlepower and lumens are both units of measurement for the amount of light emitted from a source. Candlepower measures the intensity of a light source in a specific direction, while lumens measure the total amount of visible light emitted in all directions.

Question 4

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 known as a starter because it's responsible for igniting the gas in a fluorescent lamp.

Question 5

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 6

One type of luminaire is indirect.

Accepted Answer

An indirect luminaire directs light upwards towards the ceiling or wall, which then reflects the light downwards to provide a softer, diffused lighting effect.

Question 7

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

The most common type of electric discharge lamp is the fluorescent lamp. Incandescent lamps are less common due to their inefficiency, high energy discharge lamps are typically used for specialized applications, and there is no such thing as a "commercial" lamp.

Question 8

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 them and therefore reflect most of the light that strikes them. Translucent materials allow some light to pass through but also scatter it, making them less reflective. Colored and thin materials do not necessarily have a higher reflective property.

Question 9

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

The unit of measurement used to measure the amount of illumination on a surface is foot-candle (fc). Lumen measures the total amount of light emitted by a source, candlepower is an outdated unit that measures the intensity of a light source in a specific direction, and watt is a unit of power.

Question 10

What is a luminaire?&#10;A) A lighting fixture&#10;B) A lamp&#10;C) A graph showing light intensity over distance from the source&#10;D) A type of high intensity discharge lamp

Accepted Answer

A luminaire is a lighting fixture that contains a light source, such as a bulb or LED, and distributes light in a certain direction or pattern. It may include a shade or cover to help diffuse or direct the light.

Question 11

____ 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

The answer of ____ lighting fixtures transmit 60 percent to...

Question 12

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 13

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

The answer of What is the approximate percentage of light...

Question 14

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 15

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

Accepted Answer

The answer of A light intensity curve can be used...

Deck 14: Lighting