Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 29 · 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 animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a snail (d) a goldfish
2. 2.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
3. 3.Which job needs a temperature sensor? (a) hear a whistle (b) follow a black line (c) warn if motors get hot (d) feel a bump into a wall
4. 4.⚙️ 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
5. 5.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
6. 6.📡 A robot is 150 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 7 seconds (in cm)?
7. 7.🧭 How many degrees is a right-angle turn? (a) 45° (b) 360° (c) 90° (d) 180°
8. 8.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) legs (c) wheels (d) tracks
9. 9.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
10. 10.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
13. 13.⚙️ The gear fixed to the motor is called the … (a) tyre (b) idler gear (c) driver gear (d) driven gear
14. 14.True or false: “moving under water” suits propellers. (a) True (b) False
15. 15.⚙️ 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
16. 16.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
17. 17.Which job needs a distance sensor? (a) follow a black line (b) spot a red ball (c) measure how far a box is (d) start on a hand clap
18. 18.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) nowhere (d) faster
19. 19.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
20. 20.🧭 A robot faces south. It does: turn around, turn left, turn around, turn left. Which way does it face now? (a) south (b) east (c) west (d) north
21. 21.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
22. 22.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
23. 23.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) the sensor is half (d) sound is slow
24. 24.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 30
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 180° (d) 360°
26. 26.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
27. 27.Which job needs a sound sensor? (a) start on a hand clap (b) stay balanced upright (c) measure a turn angle (d) know a button is pressed
28. 28.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a touch sensor (c) a distance sensor (d) a sound sensor
29. 29.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
30. 30.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a metal door (c) a flat wall (d) a wooden box
31. 31.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
32. 32.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times bigger (d) 3 times faster
33. 33.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
34. 34.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
35. 35.🧭 A robot should turn right 45°, but its gyro shows it turned 57°. How many degrees must it turn back to the left?
36. 36.Which of these suits legs? (a) loose sand dunes (b) a flat road (c) a smooth classroom floor (d) crossing stepping-stones
37. 37.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 180° (d) 90°
38. 38.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
39. 39.True or false: “a smooth classroom floor” suits propellers. (a) True (b) False
40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True

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