Question: At room temperature, an intrinsic silicon crystal acts approximately as_______________?

• 1. A battery
• 2. A conductor
• 3. An insulator
• 4. A piece of copper wire

Question: A forward biased pn junction diode has a resistance of the order of_____________?

• 1. O
• 2. kO
• 3. MO
• 4. None of the above

Question: In a semiconductor, current conduction is due to________________?

• 1. Only holes
• 2. Only free electrons
• 3. Holes and free electrons
• 4. None of the above

Question: The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?

• 1. 10 atoms for 108 atoms
• 2. 1 atom for 108 atoms
• 3. 1 atom for 104 atoms
• 4. 1 atom for 100 atoms

Question: The resistivity of pure germanium under standard conditions is about_______________?

• 1. 6 x 104 cm
• 2. 60 x cm
• 3. 3 x 106 cm
• 4. 6 x 10-4 cm

Question: The most commonly used semiconductor is________________?

• 1. Germanium
• 2. Silicon
• 3. Carbon
• 4. Sulphur

Question: A pentavalent impurity has______________Valence electrons?

• 1. 3
• 2. 5
• 3. 4
• 4. 6

Question: Addition of trivalent impurity to a semiconductor creates many_______________?

• 1. Holes
• 2. Free electrons
• 3. Valence electrons
• 4. Bound electrons

Question: As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor_______________?

• 1. Remains the same
• 2. Increases
• 3. Decreases
• 4. None of the above

Question: A trivalent impurity has______________valence electrons?

• 1. 4
• 2. 5
• 3. 6
• 4. 3