(1). If a small amount of antimony is added tp germanium crystal

• (a). it becomes a p-type semiconductor
• (b). the antimony becomes an acceptor atom
• (c). there will be more free electrons than holes in the semiconductor
• (d). its resistance is increased
• (e). None of these

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(2). In a n-type semiconductor which of the following statement is true?

• (a). electrons are minority carriers and pentavalent atoms are dopants
• (b). holes are minority carriers and pentavalent atoms are dopants
• (c). holes are majority carries and trivalent atoms are dopants
• (d). electrons are majority carries and trivalent atoms are dopants
• (e). None of these

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(3).

• (a). II,III and IV
• (b). III,II and I
• (c). III,III and IV
• (d). II,IV and III
• (e). None of these

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(4).

• (a). 1
• (b). 2
• (c). 3
• (d). 4
• (e). None of these

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(5). A zener diode, having breakdown voltage equal to 15C, is used in a voltage regulator circuit shown in figure. the current through the diode is

• (a). 10mA
• (b). 15mA
• (c). 20mA
• (d). 5mA
• (e). None of these

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(6). Two ideal diodes are connected to a battery as shown in the circuit. the current supplied by the battery is

• (a). 0.75 A
• (b). zero
• (c). 0.25A
• (d). 0.5A
• (e). None of these

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(7).

• (a). 0.1V
• (b). 1.0V
• (c). 1mV
• (d). 10mV
• (e). None of these

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(8).

• (a). in region(III)
• (b). both in region I and III
• (c). in region II
• (d). in region I
• (e). None of these

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(9). The figure shows a logic circuit with two inputs A and B and the output C. the voltage wave forms across A,B and C are as given, the logic gate circuit is

• (a). OR gate
• (b). NOR gate
• (c). AND gate
• (d). NAND gate
• (e). 1 and 2

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(10).

• (a). 2000
• (b). 3000
• (c). 4000
• (d). 1000
• (e). None of these

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