9c Electronics III

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Question 1 of 12

1. Question
1 point(s)
The transistor in the diagram is a _______ transistor.
- pnp
- npn
- amplifying
- auto switch
Correct

Incorrect
Question 2 of 12

2. Question
1 point(s)
The potential of terminal C should be ________ when it is connected to a circuit.
- positive
- negative
- neutral
Correct

Incorrect
Question 3 of 12

3. Question
1 point(s)
Which of the following is not true regarding the transistor circuit in the diagram?
- The emitter-base diode is forward bias.
- The collector-base diode is reverse bias.
- The resistance of the transistor will be very low if S1 is switched on.
- The resistance of the transistor will increase when switch S2 is switched on.
Correct

Incorrect
Question 4 of 12

4. Question
1 point(s)
The diagram shows a transistor circuit. Which of the following is true about the current I₁, I₂ and I₃?
- I₁ = I₂ = I₃
- I₁ < I₃ < I₂
- I₁ = I₃ , I₃ < I₂
- I₂ < I₁ < I₃
Correct

Incorrect
Question 5 of 12

5. Question
1 point(s)
The diagram shows a transistor being used as a current amplifier. The current I₁ will increase when
- The current I₂ increase.
- The current I₂ decrease.
- The current I₃ increase.
- The current I₃ decrease.
Correct

Incorrect
Question 6 of 12

6. Question
1 point(s)
The resistance of a LDR will _________ when the surrounding is bright.
- increase
- decrease
- remain unchanged
Correct

Incorrect
Question 7 of 12

7. Question
1 point(s)
The diagram shows a circuit of an automatic switch. The bulb will light up when
- the surrounding is bright.
- the surrounding is dark.
- the surrounding is cool.
- the surrounding is hot.
Correct

Incorrect
Question 8 of 12

8. Question
1 point(s)
The figure above shows the symbol of a logic gate. The logic gate is equivalent to a
- NOT gate
- NOR gate
- NAND gate
- AND gate
Correct

Incorrect
Question 9 of 12

9. Question
1 point(s)
A is a logic gate with input X and Y. Z is the output of the logic gate. The truth table of the logic gate is shown in the table above. What type of logic gate is A?
- NAND
- NOR
- OR
- AND
Correct

Incorrect
Question 10 of 12

10. Question
1 point(s)
The diagram below shows a logic gate circuit. The input at P and Q are 1001 and 1100 respectively. What is the signal of the Z output?
- 0101
- 1101
- 1111
- 0000
Correct

Incorrect
Question 11 of 12

11. Question
1 point(s)
Diagram (a) above shows a combination of logic gates labelled A, B, C and D. Table (a) shows the truth table of the logic gate. Which of the following statements below are true?
- I. A is an OR gate.
- II. B is an AND gate
- III. C is an NAND gate
- IV. D is a NOT gate
Correct

Incorrect
Question 12 of 12

12. Question
1 point(s)
The circuit shown above is a series of logic gates in an electronic appliance. The truth table of the Z output is
Correct

Incorrect