Q-11. What is the basic difference between ultraviolet , visible , and infrared radiation ?
a) half-life b) temperature c) wave length d) wave velocity
ANSWER - c) wave length
Q-12. The apparent daily path of the sun changes with the seasons because ?
a) Earth's axis is tilted
b) Earth's distance from the sun changes
c) the Sun revolves
d) the Sun Rotates
ANSWER - a) Earth's axis is tilted
Q-13. When is integral color added to concrete ?
a) At the job site
b) After the concrete is poured
c) At the batch plant
d) Within 24 hours of pour
ANSWER - c) At the batch plant
Q-14. What is the purpose of using felt on built up roof systems ?
a) To insulate the roof
b) To waterproof the roof
c) To create a "welding" process
d) To provide impact resistance
ANSWER - c) To create a "welding" process
Q-15. What is the minimum distance a septic tank can be located from structure ?
a) 5 '
b) 8 '
c) 10 '
d) 12 '
ANSWER - a) 5 '
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