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Exercise 4.2 (Diode)

This document provides information about semiconductor diodes and circuits involving diodes: 1. It discusses n-type semiconductors, which are formed by doping silicon with trivalent impurity atoms. 2. The process of adding impurities to pure semiconductors to alter their electrical properties is called doping. 3. Diodes are used to convert alternating current to direct current or vice versa. In circuits where a diode is connected to a bulb, reversing the polarity of the battery or diode is often needed to allow current to flow through the bulb.

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320 views3 pages

Exercise 4.2 (Diode)

This document provides information about semiconductor diodes and circuits involving diodes: 1. It discusses n-type semiconductors, which are formed by doping silicon with trivalent impurity atoms. 2. The process of adding impurities to pure semiconductors to alter their electrical properties is called doping. 3. Diodes are used to convert alternating current to direct current or vice versa. In circuits where a diode is connected to a bulb, reversing the polarity of the battery or diode is often needed to allow current to flow through the bulb.

Uploaded by

leelee1127
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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EXERCISE 4.

3 SEMICONDUCTOR DIODE
1. MLK11Q44 Which of the following diagrams is an ntype semiconductor? A use a new bulb B increase the number of dry cells C reverse the connection of the dry cells D connect a resistor in series with the bulb 7. SBP10Q47 Diagram shows an electric circuit set up by a student. He discovered that the bulb did not light up.

2. JHR11Q46 The impurity atom that is doped into silicon to form the n-type semiconductor is a A trivalent atom B octavalent atom C pentavalent atom D divalent atom 3. TRG11Q42 The adding of impurity into pure semiconductor material is known as A doping B rectification C amplification D thermionic emission 4. PRL10Q45 At low temperature, pure semiconductor will acts as A Conductor B Diode C Insulator D Capacitor 5. TRG10Q43 What is the function of diode? A To convert direct current to alternating current B To convert alternating current to direct current C To raise the potential difference of alternating current D To raise the potential difference of direct current 6. PRL11Q44 Diagram shows a circuit consisting of a diode and a bulb. When the switch is on, the bulb does not light up.

What needs to be changed in the circuit so that the bulb lights up? A Connect a fuse to the circuit. B Reverse the polarity of the battery. C Change the power supply to a 12 V battery. D Change the bulb with a new one. 8. MLK210Q41 Diagram shows the arrangement of silicon atoms after an atom X is dopped to form an extrinsic semiconductor.

Which of the following is not true? A The conductivity of the semiconductor increases. B The semiconductor becomes an n-type. C The majority charge carrier is electron. D Atom X is a trivalent atom. 9. MLK210Q42 Diagram shows a circuit where the bulb does not light up.

Which step will make the bulb light up? A Increasing a fuse in the circuit B Reversing the batter y connection C Changing the power supply to a 3 V battery D Reversing the bulb connection What should be done so that the bulb will light up?

10. MRSM11Q44 Which circuit will light up the lamp?

13. MLK110Q47 Diagram shows a circuit consisting of a diode and a bulb. When the switch is on, the bulb does not light up.

11. SLG08Q46 Diagram shows a circuit containing two identical bulbs R and S.

What needs to be done to light up the bulb? A Replace with new bulb B Increase the number of dry cells C Reverse the diode connection D Connect a resistor parallel to the bulb 14. JHR10Q46 Which of the following is the doping of a p-type semiconductor?

What happens to the bulbs when the switch is on? Bulb R Bulb S A Light off Light off B Light off Light up C Light up Light off D Light up Light up 12. TRG10Q44 Which of the following circuit will light up the bulb? 15. PRK10Q46 Diagram shows a circuit containing bulbs X, Y and Z.

Which bulb in the circuit will light up when switch is on? A Z only B X,Y and Z C Y and Z only D X and Y only 16. JHR10Q44 Diagram shows two diodes which are connected in parallel in a circuit.

When switch S is closed, which bulbs will light up? A P only B P and Q C P and R D P, Q and R

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