Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 941 · 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.⚙️ A motor makes 250 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
3. 3.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black soaks up light (d) black is loud
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
5. 5.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
6. 6.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
7. 7.Which of these suits wheels? (a) stepping over wide gaps (b) loose sand dunes (c) deep mud (d) a hospital corridor
8. 8.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its diameter (c) its weight (d) its radius
9. 9.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) turning (rotation) (d) sound
10. 10.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 270°. It turns left 45°, then left 135°, then right 45°. What does the gyro read now (0° to 359°)?
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.Which job needs a camera? (a) read a QR code (b) measure a turn angle (c) stop before a wall (d) start on a hand clap
13. 13.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) not at all (d) slower but stronger
14. 14.⚙️ A motor makes 240 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
15. 15.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
16. 16.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) faster (c) backwards (d) slower
17. 17.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 616 cm?
18. 18.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
19. 19.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns right 30°, then left 30°, then left 90°. What does the gyro read now (0° to 359°)?
20. 20.🧭 A robot faces north. It does: turn right, turn around, turn around, turn around. Which way does it face now? (a) south (b) west (c) east (d) north
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 40. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
22. 22.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
23. 23.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) never important (d) small (fast, weak)
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
25. 25.Which of these suits legs? (a) flying over a field (b) a flat road (c) stepping over wide gaps (d) hovering over a roof
26. 26.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are round (c) they are shiny (d) they spin in the air
27. 27.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
28. 28.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
29. 29.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 5. What is under the sensor? (a) the black line (b) the white floor
30. 30.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 18. What is under the sensor? (a) the black line (b) the white floor
31. 31.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
32. 32.⚙️ 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 big driver gear (b) a small driver gear
33. 33.True or false: to spot a red ball, use a sound sensor. (a) False (b) True
34. 34.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 2 (d) 1
35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
36. 36.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
37. 37.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 180°. It turns left 45°, then left 45°, then right 45°. What does the gyro read now (0° to 359°)?
38. 38.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) goes straight back (b) turns left (c) spins left on the spot (d) goes straight forward
39. 39.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 20
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) pins (c) spokes (d) tyres

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