9b Electronics II

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Question 1 of 11

1. Question
1 point(s)
The p-type semiconductor is produced by doping _____________ atoms into a pure semiconductor.
- trivalence
- tetravalence
- pentavalence
- electrovalaence
Correct

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Question 2 of 11

2. Question
1 point(s)
The diagram shows the arrangement of atoms of a ___________ semiconductor.
- p-type
- n-type
- np-type
- pn-type
Correct

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Question 3 of 11

3. Question
1 point(s)
Which of the following statements are not true about an n-type semiconductor?
- Its conductivity is higher than pure semiconductor.
- The majority charge carrier is electrons.
- It is produced by doping trivalent atom into a pure semiconductor.
- Its amount of holes is less than electrons.
Correct

Incorrect
Question 4 of 11

4. Question
1 point(s)
Which of the following is true about the current flows in a p-type semiconductor when it is connected to a cell?
- The majority charge carriers are electrons and they move towards the positive terminal of the cell.
- The majority charge carriers are holes and they move towards the positive terminal of the cell.
- The movement of the holes form minority current.
- The rate of flow of electrons and holes depends on the e.m.f. of the cell.
Correct

Incorrect
Question 5 of 11

5. Question
1 point(s)
Which of the following substances are widely used in electronic industry to build electronic component?
- I. Gold
- II. Silicon
- III. Germanium
- IV. Copper
Correct

Incorrect
Question 6 of 11

6. Question
1 point(s)
The formation of depletion layer is due to ___________.
- Doping
- Recombination
- Barrier potential
- Ions
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Question 7 of 11

7. Question
1 point(s)
Which of the following is true about a forward-biased semiconductor diode?
- It is made up of a p-type semiconductor.
- A large current can flow through the diode.
- The positive terminal of the electrical source is connected to the n-type semiconductor of the diode.
- The holes from the n-type semiconductor flow across the pn junction.
Correct

Incorrect
Question 8 of 11

8. Question
1 point(s)
The diagram below shows 2 circuits which contain a dry cell, a diode and a bulb respectively.

Which of the following is true about the bulb in the X circuit and the Y circuit?
- Circuit X: Light up Circuit Y: Does not light up
- Circuit X: Does not light up Circuit Y: Light up
- Circuit X: Light up Circuit Y: Light up
- Circuit X: Does not light up Circuit Y: Light up
Correct

Incorrect
Question 9 of 11

9. Question
1 point(s)
The figure shows two identical bulbs, X and Y being connected to a battery, a switch and a diode in a circuit. When the switch is opened (off), both of the bulbs light up with same brightness. What will happen to the bulbs if the switch is closed (on)?
- X and Y show the same brightness
- X is brighter than Y
- Y is brighter than X
- Both of the bulb do not light up.
Correct

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Question 10 of 11

10. Question
1 point(s)
In the diagram below. Which bulb/bulbs will light up when the switch of closed?
- P
- Q
- R
- P and R
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Question 11 of 11

11. Question
1 point(s)
Three identical resistors, R1, R2 and R3 are connected to a bridge rectifier as shown in the diagram below. Which of the resistor will only have direct current flows in it?
- R₁
- R₂
- R₃
- All R₁, R₂ and R₃
Correct

Incorrect