Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 820 · 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 small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) at the same speed (d) slower but stronger
2. 2.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
3. 3.True or false: “moving under water” suits propellers. (a) False (b) True
4. 4.🛞 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) curves to the left (b) curves to the right (c) goes straight forward
5. 5.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
7. 7.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
8. 8.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
9. 9.🧭 A robot faces west. It does: turn right, turn around, turn right. Which way does it face now? (a) east (b) south (c) west (d) north
10. 10.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
12. 12.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) propellers (b) tracks (c) legs (d) wheels
13. 13.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a dark tunnel (d) a white surface
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
15. 15.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.🧭 A robot faces east. It does: turn around, turn left. Which way does it face now? (a) west (b) east (c) north (d) south
17. 17.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 1 (c) 4 (d) 3
18. 18.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) zero (d) big (slow and strong)
19. 19.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points up and left (c) points straight up (d) points up and right
20. 20.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 80. What is under the sensor? (a) the white floor (b) the black line
21. 21.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) legs (c) propellers (d) wheels
22. 22.🦾 A servo moves from 140° to 150°. How many degrees does it turn?
23. 23.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) driven gear (c) idler gear (d) tyre
24. 24.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 25. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
26. 26.Which job needs a light sensor? (a) find the brightest spot (b) stay balanced upright (c) feel a bump into a wall (d) stop before a wall
27. 27.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a temperature sensor (c) a gyro sensor (d) a camera
29. 29.🧭 A robot faces north. It does: turn right, turn right, turn right, turn right. Which way does it face now? (a) west (b) east (c) north (d) south
30. 30.Which of these suits legs? (a) a muddy building site (b) a flat road (c) crossing stepping-stones (d) deep mud
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
32. 32.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 90° (d) 45°
36. 36.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
37. 37.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
38. 38.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
39. 39.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
40. 40.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big

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