ETA/CET COMPREHENSIVE CERTIFICATION TEST 2026 COMPLETE QUESTIONS AND ANSWERS

ETA/CET COMPREHENSIVE CERTIFICATION
TEST 2026 COMPLETE QUESTIONS AND
ANSWERS

◉ 24. In fiber optics, is typically used to describe the output of a
light source.
A. Frequency
B. Wavelength
C. Hertz
D. Kilometers
Answer: B. Wavelength


◉ 25. Which of the following forms of electromagnetic energy has a
longer wavelength than the other three?
A. Infrared light
B. Visible light
C. Gamma rays
D. Ultraviolet light
Answer: A. Infrared light


◉ 6. Which wavelength windows are most commonly used for fiber
optics?

, A. 400nm, 750nm, and 850nm
B. 550nm, 580nm, and 620nm
C. 620nm, 750, and 850nm
D. 850.nm, 1300nm, and 1550nm
Answer: D. 850.nm, 1300nm, and 1550nm


◉ 27. Refraction is caused by
A. Light changing color as it passes from one medium into another
B. Light changing speed as it passes from one medium into another
C. Light changing frequency as it passes from one medium into
another
D. Light changing direction within a single medium
Answer: A. Light changing color as it passes from one medium into
another


◉ 28. Light would travel the fastest through a medium with a
refractive index of.
A. 1.0003
B. 1.33
C. 1.47
D. 1.5
Answer: A. 1.0003