Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 956 · 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’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 66 cm?
2. 2.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times bigger (d) 3 times slower
3. 3.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
4. 4.🛞 Circumference = π × … (a) diameter (b) radius only (c) weight (d) speed
5. 5.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
7. 7.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
11. 11.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
13. 13.🧭 A robot faces west. It does: turn right, turn right, turn left. Which way does it face now? (a) west (b) north (c) east (d) south
14. 14.🛞 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) turns left (b) spins left on the spot (c) spins right on the spot (d) goes straight back
15. 15.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
16. 16.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the top speed (d) the wheel size
17. 17.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
18. 18.Which of these suits legs? (a) a long factory floor (b) a field of tall boulders (c) hovering over a roof (d) a muddy building site
19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
20. 20.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
21. 21.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
23. 23.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
24. 24.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) one wheel runs faster (c) it jumps (d) it stops for ever
25. 25.Which job needs a light sensor? (a) stop before a wall (b) find the brightest spot (c) warn if motors get hot (d) measure a turn angle
26. 26.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 47. What is under the sensor? (a) the white floor (b) the black line
27. 27.Which job needs a gyro sensor? (a) read a QR code (b) stop before a wall (c) stay balanced upright (d) spot a red ball
28. 28.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
30. 30.Which of these suits propellers? (a) a long factory floor (b) flying over a field (c) a flat road (d) a field of tall boulders
31. 31.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: to start on a hand clap, use a touch sensor. (a) True (b) False
33. 33.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
34. 34.True or false: “a hospital corridor” suits legs. (a) True (b) False
35. 35.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 45° (d) 180°
36. 36.🧭 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 left 45°, then left 135°. What does the gyro read now (0° to 359°)?
37. 37.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black soaks up light (d) black is hot
38. 38.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
39. 39.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
40. 40.Which job needs a touch sensor? (a) find the brightest spot (b) know a button is pressed (c) stay balanced upright (d) read a QR code

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