Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 460 · 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 motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
2. 2.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
4. 4.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
5. 5.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
6. 6.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
7. 7.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
8. 8.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
10. 10.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) small (fast, weak) (d) never important
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 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 left (c) curves to the right
12. 12.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 25. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
14. 14.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) slower but stronger (d) not at all
15. 15.📡 A robot is 300 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 23 seconds (in cm)?
16. 16.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
18. 18.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
19. 19.⚙️ A 30-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
20. 20.🦾 A servo moves from 60° to 70°. How many degrees does it turn?
21. 21.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
22. 22.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they spread the weight (c) they are round (d) they are shiny
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
24. 24.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a black line (d) a white surface
25. 25.True or false: “loose sand dunes” suits tracks. (a) True (b) False
26. 26.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
27. 27.🧭 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 60°, then left 180°, then left 60°. What does the gyro read now (0° to 359°)?
28. 28.Which job needs a distance sensor? (a) find the brightest spot (b) stop before a wall (c) start on a hand clap (d) measure a turn angle
29. 29.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) backwards (c) nowhere (d) faster
30. 30.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
31. 31.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
32. 32.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) wheels (c) legs (d) tracks
33. 33.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🧭 A robot should turn right 45°, but its gyro shows it turned 32°. How many degrees must it turn more to the right?
35. 35.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
36. 36.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) white (d) water
37. 37.Which of these suits propellers? (a) flying over a field (b) loose sand dunes (c) a long factory floor (d) soft snow
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 50
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the wheel size (d) the black/white cut-off
40. 40.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they are too cheap (c) they never tire (d) too fast on floors

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