Applied Technology

Question 1

1A transistor switch turns on when

Easy

A. no current flows B. it is heated C. it is reversed D. enough current flows into its base

Question 2

2Which logic gate gives an output of 1 only when both inputs are 1?

Easy

A. OR B. AND C. NOT D. NOR

Question 3

3A resistor has the colour bands red, red and brown. What is its value?

Medium

A. 2.2 kΩ B. 22 Ω C. 220 Ω D. 122 Ω

Question 4

4A 555 timer in astable mode with R₁ = R₂ = 10 kΩ and C = 10 μF has a frequency of about

Hard

A. 4.8 Hz B. 48 Hz C. 0.48 Hz D. 480 Hz

Question 5

5The unit of capacitance is the

Easy

A. farad B. watt C. ohm D. henry

Question 6

6Three 1.5 V cells are connected in series. What is the total voltage?

Easy

A. 3 V B. 0.5 V C. 1.5 V D. 4.5 V

Question 7

7A relay is

Easy

A. a resistor B. a battery C. a light bulb D. an electrically operated switch

Question 8

8In digital electronics, a logic 1 usually represents

Easy

A. a negative voltage B. zero voltage C. a high voltage D. no signal

Question 9

9An integrated circuit (IC) is

Easy

A. a wire B. a single resistor C. many components on a single chip D. a battery

Question 10

10A 555 timer IC is used to

Medium

A. produce timing pulses and delays B. store data C. rectify AC D. amplify sound only