Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 704 · 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 servo moves from 70° to 180°. How many degrees does it turn?
2. 2.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
3. 3.Which job needs a camera? (a) read a QR code (b) follow a black line (c) start on a hand clap (d) warn if motors get hot
4. 4.⚙️ A motor makes 100 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?
5. 5.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
6. 6.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
7. 7.Which job needs a sound sensor? (a) measure a turn angle (b) start on a hand clap (c) stop before a wall (d) follow a black line
8. 8.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 180° (d) 360°
9. 9.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
10. 10.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
11. 11.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
12. 12.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
13. 13.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
14. 14.Which of these suits propellers? (a) deep mud (b) crossing stepping-stones (c) stepping over wide gaps (d) hovering over a roof
15. 15.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) not at all (d) faster but weaker
16. 16.📡 A robot is 250 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 10 seconds (in cm)?
17. 17.🧭 A robot should turn right 45°, but its gyro shows it turned 59°. How many degrees must it turn back to the left?
18. 18.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it jumps (c) it stops for ever (d) one wheel runs faster
19. 19.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.🧭 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 30°, then left 180°, then right 135°. What does the gyro read now (0° to 359°)?
21. 21.🔍 Which sensor helps a robot hear a whistle? (a) a camera (b) a sound sensor (c) a touch sensor (d) a gyro sensor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
24. 24.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
25. 25.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) spins left on the spot (b) goes straight back (c) stays still (d) goes straight forward
27. 27.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a metal door (c) a wooden box (d) a flat wall
28. 28.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 45° (d) 360°
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
30. 30.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) bright light (d) radio music
31. 31.⚙️ 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
32. 32.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 66. What is under the sensor? (a) the white floor (b) the black line
33. 33.🧭 A robot spins 15° every second. How many seconds does it take to turn 120°?
34. 34.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
35. 35.🧭 A robot should turn right 90°, but its gyro shows it turned 97°. How many degrees must it turn back to the left?
36. 36.True or false: “crossing stepping-stones” suits legs. (a) False (b) True
37. 37.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
38. 38.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) they never tire (c) harder to balance (d) too fast on floors
39. 39.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
40. 40.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

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