Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 245 · 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.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
2. 2.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
3. 3.📡 A robot is 100 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
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.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 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
6. 6.🦾 A servo program runs:
   angle = 80
   angle = angle − 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it stops for ever (c) it jumps (d) it uses a sail
9. 9.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.📡 A robot is 220 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 13 seconds (in cm)?
11. 11.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
12. 12.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
13. 13.🛞 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 forward. What does the robot do? (a) goes straight back (b) spins left on the spot (c) stays still (d) goes straight forward
14. 14.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
15. 15.📡 A robot is 240 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
16. 16.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
17. 17.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) wheels (c) legs (d) propellers
18. 18.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) propellers (c) tracks (d) legs
19. 19.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 60
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
21. 21.🛞 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) goes straight forward (b) curves to the right (c) curves to the left
22. 22.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
23. 23.Which of these suits tracks? (a) crossing stepping-stones (b) a muddy building site (c) a smooth classroom floor (d) hovering over a roof
24. 24.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
25. 25.📡 A robot is 140 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 3 seconds (in cm)?
26. 26.🧭 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 right 90°, then right 180°. What does the gyro read now (0° to 359°)?
27. 27.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
28. 28.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a white surface (d) a black line
30. 30.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) the same direction (c) in opposite directions (d) one up, one down
31. 31.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
32. 32.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
33. 33.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a touch sensor (c) a gyro sensor (d) a light sensor
34. 34.Which job needs a sound sensor? (a) measure how far a box is (b) follow a black line (c) read a QR code (d) start on a hand clap
35. 35.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
36. 36.🧭 A robot spins 15° every second. How many seconds does it take to turn 360°?
37. 37.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a touch sensor (c) a sound sensor (d) a camera
38. 38.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a flat wall (d) a soft foam cushion
39. 39.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
40. 40.⚙️ 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 big driver gear (b) a small driver gear

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