Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 65 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
2. 2.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
3. 3.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
5. 5.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) propellers (c) legs (d) tracks
6. 6.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
7. 7.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
8. 8.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 45° (d) 90°
9. 9.🧭 A robot spins 45° every second. How many seconds does it take to turn 225°?
10. 10.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a white surface (d) a black line
11. 11.Which of these suits wheels? (a) stepping over wide gaps (b) soft snow (c) a flat road (d) loose sand dunes
12. 12.⚙️ A 36-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
13. 13.True or false: “deep mud” suits legs. (a) True (b) False
14. 14.⚙️ A 15-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
15. 15.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
17. 17.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
19. 19.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
20. 20.Which job needs a camera? (a) find the brightest spot (b) spot a red ball (c) start on a hand clap (d) know a button is pressed
21. 21.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) teeth (c) spokes (d) tyres
22. 22.Which of these suits propellers? (a) hovering over a roof (b) loose sand dunes (c) a smooth classroom floor (d) a flat road
23. 23.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
24. 24.🛞 Circumference = π × … (a) speed (b) radius only (c) weight (d) diameter
25. 25.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) tracks (c) wheels (d) legs
26. 26.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 792 cm?
27. 27.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
28. 28.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 360° (d) 90°
30. 30.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
31. 31.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
32. 32.True or false: to measure a turn angle, use a gyro sensor. (a) True (b) False
33. 33.True or false: “loose sand dunes” suits tracks. (a) True (b) False
34. 34.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
35. 35.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius
36. 36.🔍 What does a gyro sensor measure? (a) colour (b) turning (rotation) (c) temperature (d) sound
37. 37.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) a gear (d) an input
38. 38.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.Which of these suits tracks? (a) a field of tall boulders (b) a hospital corridor (c) a flat road (d) soft snow
40. 40.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) small (fast, weak) (c) zero (d) never important

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