• #### 1.  A simple diode rectifier circuit can convert: I. AC voltage to DC voltage II. DC voltage to AC voltage III. Small AC voltage to a large AC voltage

• I only
• II only
• III only
• I and II only
• I and III only

• 0 V
• 0.2 V
• 0.7 V
• 5.3 V
• #### 3.  For the circuit shown below, the output will be:

• 2 negative peaks per full cycle of input
• 2 Positive peaks per full cycle of input
• Negative peaks for negative half cycles of input
• Positive peaks for positive half cycles of input
• Zero volts

• Antimony
• Boron
• Chlorine
• Argon

• 1.3 V
• 7.3 V
• 7.7 V
• 8.4 V
• #### 6.  Diagram 12 shows the arrangement of silicon atoms after an atom X is doped to form an extrinsic semiconductor. Which of the following is true?

• The conductivity of the semiconductor decreases.
• The semiconductor becomes a p-type.
• The majority charge carrier is electron.
• Atom X is a trivalent atom
• #### 7.  Let np and ne be the number density of holes and conduction electrons respectively in a semiconductor. Then,

• np > ne in an intrinsic semiconductor, I < Ip + Ie
• np = ne in an extrinsic semiconductor, I > Ip + Ie﻿
• np = ne in an intrinsic semiconductor, I = Ip + Ie﻿
• np > ne in an intrinsic semiconductor, I = 0( Here, Ip = current due to holes,Ie﻿= current due to electrons, I= total current)

• A
• B
• C
• D
• #### 9.  Diagram 11 shows a circuit with a bulb that does not light up. Which of the following actions will make the bulb light up?

• Connecting a fuse to the circuit
• Reversing the battery connection
• Changing the power supply to a 3V battery
• Reversing the bulb connection

• A
• B
• C
• D
• #### 11.  Which of the following statements is NOT the diode application in electronic circuit?

• Diode as voltage regulator
• Diode as Rectifier
• Diode as Amplifier
• Diode as solar cell
• #### 12.  1. The resistivity of a semiconductor lies between

• (a)10 -6 Ωm to10-8 Ωm
• n(b) 108 Ωm to1014 Ωm
• (c) 10 -2 Ωm to104 Ωm
• (d) none of these
• #### 13.  Diagram 13 shows five identical bulbs P, Q, R, S and T in a circuit. Which bulbs light up continuously when the switch is on?

• P, Q and T only
• Q and S only
• R and S only
• P and R only

• Antimony
• Boron
• Chlorine
• Argon
Report Question
access_time