Woodlands Ring Prelim 2022

This document consists of 22 printed pages. WOODLANDS RING SECONDARY SCHOOL Name : _____________________________ Reg No. ________ Class : ____________ _______________________________________________________________________ EXAMINATION : PRELIMINARY EXAMINATION LEVEL : SECONDARY 4 EXPRESS DATE: 31 AUG 2022 SUBJECT : ELECTRONICS (6063) PAPER: 1 DURATION : 2 hours MAX MARKS: 100 SETTER(S) : Mr Ong Chee Lim Parent’s/Guardian’s Signature: ______________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. You may use a calculator. Section A Answer all questions. Section B Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 100. 100

2 DATASHEET Resistor Colour Codes 1st Colour Band 1st Digit 2nd Colour Band 2nd Digit 3rd Colour Band Multiplier 4th Colour Band Tolerance Black 0 Black 0 Black 0 Gold ± 5% Brown 1 Brown 1 Brown 1 Red ± 2% Red 2 Red 2 Red 2 Orange 3 Orange 3 Orange 3 Yellow 4 Yellow 4 Yellow 4 Green 5 Green 5 Green 5 Blue 6 Blue 6 Blue 6 Violet 7 Violet 7 Violet 7 Grey 8 Grey 8 Silver 0.01 White 9 White 9 Gold 0.1 Preferred values for resistors (E24 SERIES) 1.0 1.1 1.2 1.3 1.5 1.6 1.8 2.0 2.2 2.4 2.7 3.0 3.3 3.6 4.3 4.7 5.1 5.6 6.2 6.8 7.5 8.2 9.1 and multiples of ten.

3 Table on Boolean algebra Single variable theorems Laws of Complementation • 0 = 1 • 1 = 0 • A̿ = A AND Laws • A. 0 = 0 • A ∙ 1 = A • A ∙ A = A • A ∙ A = 0 OR Laws • A + 0 = A • A + 1 = 1 • A + A = A • A + A = 1 Multivariable theorems Commutative Laws • A + B = B + A • A ∙ B = B ∙ A Associative Laws • A + (B + C) = (A + B) + C = A + B + C • A ∙ (B ∙ C) = (A ∙ B) ∙ C = A ∙ B ∙ C Distributive Laws • A ∙ (B + C) = A ∙ B + A ∙ C ; • (A + B) ∙ (C + D) = A ∙ C + B ∙ C + A ∙ D + B ∙ D Absorptive Laws • A + A ∙ B = A • A ∙ (A + B) = A • A + A̅ ∙ B = A + B • A ∙ (A̅ + B) = A ∙ B DeMorgan’s Theorems • (A + B) = A ∙ B • (A ∙ B) = A + B

4 Section A Answer all questions in this section. 1 A heating lamp has seven subsystems to turn on the heat as shown in Fig. 1.1. Fig. 1.1 Write the name (s) of each subsystem in the heating lamp to the correct function(s) in Table 1.1. Table 1.1 Function of subsystem Name(s) of subsystem Input Output Logic Timer Analogue to digital converter Switch [6] 2 Fig. 2.1 shows a simple resistor circuit. Fig. 2.1 Calculate the total effective resistance of the circuit. ………….…………………………………