Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 260 · 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.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
2. 2.True or false: “soft snow” suits tracks. (a) True (b) False
3. 3.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the black/white cut-off (d) the battery size
4. 4.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) tracks (c) propellers (d) legs
5. 5.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a snail (d) a bat
6. 6.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
7. 7.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are round (c) they spin in the air (d) they are shiny
8. 8.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
10. 10.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black surface (c) a black line (d) a dark tunnel
11. 11.⚙️ A motor makes 280 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
12. 12.📡 A robot is 100 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 16 seconds (in cm)?
13. 13.🧭 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 90°. It turns right 30°, then right 60°. What does the gyro read now (0° to 359°)?
14. 14.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
15. 15.🧭 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 30°, then right 60°. What does the gyro read now (0° to 359°)?
16. 16.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
18. 18.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
20. 20.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
21. 21.🧭 A robot spins 45° every second. How many seconds does it take to turn 180°?
22. 22.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a distance sensor (c) a camera (d) a light sensor
23. 23.🧭 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 90°. It turns right 120°, then left 45°, then left 120°. What does the gyro read now (0° to 359°)?
24. 24.🧭 A robot faces east. It does: turn right, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
25. 25.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 360° (d) 180°
27. 27.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) tracks (c) propellers (d) legs
28. 28.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) an input (d) a gear
29. 29.Which job needs a camera? (a) spot a red ball (b) warn if motors get hot (c) know a button is pressed (d) stop before a wall
30. 30.Which of these suits wheels? (a) a hospital corridor (b) soft snow (c) a muddy building site (d) deep mud
31. 31.Which job needs a distance sensor? (a) stop before a wall (b) feel a bump into a wall (c) spot a red ball (d) know a button is pressed
32. 32.True or false: “deep mud” suits legs. (a) True (b) False
33. 33.🧭 A robot spins 60° every second. How many seconds does it take to turn 300°?
34. 34.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
35. 35.Which job needs a camera? (a) stay balanced upright (b) read a QR code (c) follow a black line (d) start on a hand clap
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns right (b) spins right on the spot (c) turns left (d) spins left on the spot
38. 38.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a wooden box (d) a metal door
39. 39.⚙️ 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
40. 40.🧭 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 135°. What does the gyro read now (0° to 359°)?

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