Certification Practice Exam Questions

BICSI Installer 2 Optical Fiber Certification Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of optical fiber cabling?
• To transmit electrical power
• To transmit data using light signals
• To transmit data using light signals
• To convert light into sound

Rationale: Optical fiber cabling transmits data as light signals, enabling

high-speed and long-distance communication.

• Which of the following is a characteristic of single-mode fiber (SMF)?
• Has a larger core size than multimode fiber
• Has a smaller core size and allows one light path 1 / 4

• Used primarily for short-distance networks
• Uses LED light sources

Rationale: Single-mode fiber has a small core (about 9 µm) that supports

one light path, reducing dispersion over long distances.

• What is the typical core diameter of multimode fiber (MMF)?
• 8–10 µm
• 50 or 62.5 µm
• 100 µm
• 125 µm

Rationale: Multimode fiber commonly comes in 50 µm and 62.5 µm core

diameters, allowing multiple light modes.

• Which light source is commonly used in single-mode fiber systems?

A. LED

• Laser (LD)
• Fluorescent light
• Halogen bulb

Rationale: Lasers are used in SMF because they provide coherent, high-

intensity light ideal for long-distance transmission.

• / 4

5. The cladding of an optical fiber serves to:

• Protect the core from mechanical damage
• Keep the light confined within the core by total internal reflection
• Carry the electrical current
• Absorb stray light

Rationale: Cladding reflects light back into the core through total internal

reflection, maintaining signal strength.

• What is the numerical aperture (NA) of a fiber?
• The fiber’s physical diameter
• The measure of its light-gathering ability
• The type of connector used
• The attenuation value

Rationale: Numerical aperture defines how much light can be accepted

into the fiber core, influencing coupling efficiency.

• Which connector type is commonly used in fiber optic systems?

A. RJ-45

• SC

C. BNC

D. TNC

Rationale: SC (Subscriber Connector) is a popular push-pull type used for

both MMF and SMF. 3 / 4

• The acronym “LC” stands for what in fiber connectors?
• Line Connector
• Linear Coupling
• Lucent Connector
• Light Carrier

Rationale: LC stands for Lucent Connector, a small form-factor connector

designed for high-density fiber applications.

• Which fiber optic polishing type has the least back reflection?
• Flat polish
• PC polish
• UPC polish
• APC polish

Rationale: APC (Angled Physical Contact) connectors have an 8° angle,

minimizing back reflection to about -60 dB.

• What is the main cause of signal attenuation in optical fibers?
• Capacitance
• Inductance
• Absorption and scattering
• Magnetic interference
• / 4