1 p -type semiconductor conducts electricity with __________.A) electrons B) protons C) holes D) neutrons 2 A) to increase resistance B) to increase the forbidden gap C) to make semiconductors electrically neutral D) to increase conductivity 3 In the figure below, what should be the overall direction of the electron drift?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617937/od.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>]]> A) right B) left C) up D) down 4 A) greater than 1 eV B) 1 eV or less C) exactly 1 eV D) 1 V or less 5 A) The conductivity is reduced. B) The resistance is reduced. C) The conductivity increases. D) nothing 6 n -type semiconductor conducts electricity with __________.A) holes B) neutrons C) protons D) electrons 7 A) They vibrate. B) They disappear completely. C) They join into one energy level. D) They split into broad bands with forbidden gaps. 8 In the figure below, what resistor should be used to increase the current to 25 mA? Assume that the potential drop across the LED is still 1.2 V.
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617937/oe.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>]]> A) 120 Ω B) 192 Ω C) 300 Ω D) 240 Ω 9 If the diode connected to ammeter A2 in the figure below were reversed, what would happen to A2 's reading?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617937/of.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (7.0K)</a>]]> A) It would increase. B) It would read zero. C) It would decrease to a non-zero value. D) It would remain unchanged. 10 If the battery in the figure below were reversed, which lamp(s) would light?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617937/og.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (4.0K)</a>]]> A) neither lamp B) L1 only C) L2 only D) both lamps 11 If the diode connected to ammeter A2 in the figure below were reversed, what would happen to A1 's reading?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617937/of.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (7.0K)</a>]]> A) It would read zero. B) It would remain unchanged. C) It would decrease to a non-zero value. D) It would increase. 12 In the figure below, how does the current go through the diodes?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617937/oh.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (2.0K)</a>]]> A) to the right for the top one, no current through the bottom one B) no current through the top one, to the left for the bottom one C) to the left for the top one, the right for the bottom one D) to the right for the top one, the left for the bottom one
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