Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 736 · 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 light sensor reads below 30 over a black line and above 30 over the white floor. It reads 22. What is under the sensor? (a) the black line (b) the white floor
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
4. 4.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
5. 5.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
6. 6.⚙️ A motor makes 120 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
7. 7.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
8. 8.🔍 Which sensor helps a robot find the brightest spot? (a) a gyro sensor (b) a camera (c) a sound sensor (d) a light sensor
9. 9.Which of these suits propellers? (a) a muddy building site (b) flying over a field (c) crossing stepping-stones (d) stepping over wide gaps
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
11. 11.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.True or false: to start on a hand clap, use a camera. (a) False (b) True
13. 13.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
14. 14.True or false: “a hospital corridor” suits legs. (a) False (b) True
15. 15.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
16. 16.Which of these suits legs? (a) a field of tall boulders (b) a smooth classroom floor (c) flying over a field (d) a flat road
17. 17.Which of these suits legs? (a) soft snow (b) a long factory floor (c) stepping over wide gaps (d) a flat road
18. 18.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
19. 19.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
20. 20.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) an input (d) a wheel
21. 21.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a white surface (d) a black surface
22. 22.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) spins right on the spot (b) turns right (c) goes straight forward (d) stays still
23. 23.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
24. 24.🧭 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 left 120°, then right 45°, then right 30°. What does the gyro read now (0° to 359°)?
25. 25.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.Which job needs a temperature sensor? (a) warn if motors get hot (b) know a button is pressed (c) hear a whistle (d) follow a black line
27. 27.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
28. 28.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) tyres (c) pins (d) teeth
30. 30.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
31. 31.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
32. 32.True or false: “loose sand dunes” suits propellers. (a) True (b) False
33. 33.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 3 (d) 4
34. 34.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 45° (d) 180°
35. 35.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 25 times. How many times does the driven gear turn?
36. 36.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
38. 38.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) propellers (c) legs (d) tracks
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left

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