Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 711 · 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 has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) stays still (b) goes straight back (c) goes straight forward (d) turns left
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
3. 3.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
4. 4.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
5. 5.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) faster and weaker (c) at the same speed (d) not at all
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
7. 7.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
8. 8.🔍 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
9. 9.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) one wheel runs faster (c) it jumps (d) it uses a sail
13. 13.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
14. 14.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black is hot (d) black soaks up light
15. 15.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 50
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points up and left (c) points left (d) points up and right
18. 18.🧭 A robot spins 30° every second. How many seconds does it take to turn 240°?
19. 19.Which of these suits propellers? (a) a muddy building site (b) a hospital corridor (c) crossing stepping-stones (d) hovering over a roof
20. 20.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) tracks (c) wheels (d) propellers
21. 21.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
22. 22.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
24. 24.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
25. 25.Which of these suits wheels? (a) moving under water (b) loose sand dunes (c) deep mud (d) a long factory floor
26. 26.🧭 A robot should turn right 90°, but its gyro shows it turned 83°. How many degrees must it turn more to the right?
27. 27.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
28. 28.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
29. 29.True or false: “a flat road” suits propellers. (a) False (b) True
30. 30.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) they do not turn (d) one up, one down
31. 31.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
32. 32.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) nowhere (c) faster (d) slower
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 0°. It turns right 180°, then right 180°, then left 60°. What does the gyro read now (0° to 359°)?
34. 34.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
35. 35.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
36. 36.True or false: “a flat road” suits tracks. (a) True (b) False
37. 37.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) black (d) the sky
38. 38.⚙️ A 12-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
39. 39.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) goes straight back (b) stays still (c) turns left (d) spins right on the spot
40. 40.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big

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