What are the greenhouse gases and what percentage of the atmosphere do they represent?
What will be an ideal response?
ANS:
Gases that are known to contribute to the greenhouse effect include carbon dioxide, water vapor, ozone, methane, halocarbons, and nitrous oxide. They are often referred to as greenhouse gases. The combined volume of these gases is approximately one percent of all gases in the atmosphere.
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What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second?
a. 10Hz b. 20Hz c. 30Hz d. 40Hz
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Which of these produces the sound heard from automotive horns?
A) Coil B) Relay C) Horn button D) Diaphragm
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When seating a bead of a tire, never exceed ________ psi
A) 50 B) 30 C) 40 D) 60
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In a BCD counter, an output of 0000 occurs one clock pulse after the ________ output
A) 1001 B) 1111 C) 1101 D) 1011
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