Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 990 · 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 is 290 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 17 seconds (in cm)?
2. 2.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
3. 3.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
4. 4.Which of these suits tracks? (a) a long factory floor (b) a muddy building site (c) a hospital corridor (d) stepping over wide gaps
5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
6. 6.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) propellers (c) tracks (d) legs
7. 7.🛞 Circumference = π × … (a) speed (b) radius only (c) diameter (d) weight
8. 8.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) black (d) water
9. 9.📡 A robot is 200 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
10. 10.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
11. 11.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
12. 12.🦾 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 up and left (b) points up and right (c) points right (d) points left
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
14. 14.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 90° (c) 45° (d) 360°
15. 15.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) wheels (c) tracks (d) legs
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
18. 18.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a wooden box (d) a metal door
19. 19.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
20. 20.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times bigger (d) 3 times faster
21. 21.🔦 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
22. 22.Which job needs a sound sensor? (a) follow a black line (b) measure how far a box is (c) start on a hand clap (d) measure a turn angle
23. 23.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
24. 24.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) at the same speed (c) slower but stronger (d) faster and weaker
25. 25.Which of these suits propellers? (a) loose sand dunes (b) flying over a field (c) stepping over wide gaps (d) a muddy building site
26. 26.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
27. 27.True or false: to read a QR code, use a light sensor. (a) False (b) True
28. 28.True or false: to measure a turn angle, use a gyro sensor. (a) False (b) True
29. 29.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.📡 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)?
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
32. 32.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) far behind it (d) under the right sensor
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
34. 34.🛞 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) stays still (b) turns right (c) goes straight back (d) goes straight forward
35. 35.⚙️ 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
36. 36.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) wheels (c) legs (d) propellers
37. 37.🧭 A robot faces west. It does: turn left, turn left, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
38. 38.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
39. 39.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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