Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 933 · 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 robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
2. 2.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) legs (c) propellers (d) wheels
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
4. 4.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
5. 5.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
6. 6.🧭 A robot should turn right 180°, but its gyro shows it turned 189°. How many degrees must it turn back to the left?
7. 7.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 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 left (c) curves to the right
8. 8.⬛ The threshold of a light sensor is … (a) the wheel size (b) the black/white cut-off (c) the battery size (d) the top speed
9. 9.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
10. 10.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black is hot (d) black soaks up light
11. 11.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a black surface (d) a white surface
12. 12.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) number of gears (d) wheel size
13. 13.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.Which of these suits wheels? (a) soft snow (b) stepping over wide gaps (c) deep mud (d) a hospital corridor
15. 15.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
16. 16.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
17. 17.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
18. 18.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
19. 19.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
20. 20.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) at the same speed (c) faster but weaker (d) slower but stronger
21. 21.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
22. 22.🛞 Which way of moving suits this best: “moving under water”? (a) propellers (b) wheels (c) tracks (d) legs
23. 23.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
24. 24.True or false: “a muddy building site” suits propellers. (a) True (b) False
25. 25.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.🧭 A robot should turn right 45°, but its gyro shows it turned 48°. How many degrees must it turn back to the left?
29. 29.True or false: to spot a red ball, use a camera. (a) False (b) True
30. 30.True or false: to know a button is pressed, use a sound sensor. (a) False (b) True
31. 31.🛞 Circumference = π × … (a) radius only (b) weight (c) diameter (d) speed
32. 32.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
33. 33.🧭 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 left 90°, then left 180°. What does the gyro read now (0° to 359°)?
34. 34.Which of these suits legs? (a) a hospital corridor (b) soft snow (c) a smooth classroom floor (d) crossing stepping-stones
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
38. 38.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) spins right on the spot (b) turns right (c) turns left (d) stays still
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 13 seconds (in cm)?

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