Practice exam

How to use this paper

• Once, properly. Late in the runway, 75 minutes on a timer, paper and pen, every hub closed, answers hidden. A practice exam taken open-book measures your searching, not your knowledge.
• Mark honestly. Reveal each answer only after writing yours. The marking notes say what earns full and partial credit; score yourself the way a stranger would.
• Mine the misses. Every lost point names a review page; the table at the bottom routes each section back to its material. A 70% with a study list beats an unexamined feeling of readiness.

Section A · Tools, short answers (16 points, 2 each)

Section B · Electricity and GPIO (12 points)

Section C · Reading code (12 points)

Traceback (most recent call last):
  File "blink.py", line 7, in <module>
    led.blink(0.2 0.2)
SyntaxError: invalid syntax

def double(n):
    print(n * 2)

result = double(4)
print(result)

SET count TO 0
SET total TO 0
WHILE count < 4
    SET count TO count + 1
    IF count = 3 THEN
        SET total TO total + 10
    ELSE
        SET total TO total + count
    END IF
END WHILE
OUTPUT total

FUNCTION classify(ms)
    IF ms < 250 THEN
        RETURN "fast"
    ELSE IF ms < 450 THEN
        RETURN "ok"
    ELSE
        RETURN "slow"
    END IF
END FUNCTION

def classify(ms):
    if ms < 250:
        return "fast"
    elif ms < 450:
        return "ok"
    else:
        return "slow"

class Door:
    def __init__(self):
        self.is_open = False      # D1

    def open(self):
        self.is_open = True       # D2

    def close(self):
        self.is_open = False

    def describe(self):           # D3
        if self.is_open:
            return "open"
        return "closed"

class Log:
    items = []
    def add(self, x):
        self.items.append(x)

a = Log()
b = Log()
a.add(1)
print(len(b.items))