Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 34 · 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.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
2. 2.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
3. 3.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points right (c) points up and right (d) points up and left
4. 4.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) legs (c) wheels (d) tracks
5. 5.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) a gear (d) an input
6. 6.Which of these suits wheels? (a) a smooth classroom floor (b) moving under water (c) stepping over wide gaps (d) a field of tall boulders
7. 7.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
9. 9.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
10. 10.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a gyro sensor (c) a distance sensor (d) a temperature sensor
11. 11.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
12. 12.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
13. 13.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) tracks (c) propellers (d) wheels
14. 14.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
15. 15.🛞 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) stays still (b) goes straight back (c) turns right (d) spins right on the spot
16. 16.🧭 A robot should turn right 45°, but its gyro shows it turned 54°. How many degrees must it turn back to the left?
17. 17.🛞 Circumference = π × … (a) speed (b) radius only (c) diameter (d) weight
18. 18.Which of these suits wheels? (a) stepping over wide gaps (b) a hospital corridor (c) moving under water (d) crossing stepping-stones
19. 19.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
20. 20.True or false: “a flat road” suits wheels. (a) True (b) False
21. 21.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
22. 22.🧭 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 270°. It turns left 180°, then right 30°. What does the gyro read now (0° to 359°)?
23. 23.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) not at all (c) slower but stronger (d) faster and weaker
24. 24.🦾 A servo moves from 140° to 0°. How many degrees does it turn?
25. 25.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they spin in the air (c) they are round (d) they are shiny
26. 26.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) black (d) white
27. 27.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black surface (c) a black line (d) a dark tunnel
28. 28.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
29. 29.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
31. 31.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driver gear (c) idler gear (d) driven gear
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle − 40
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
35. 35.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.True or false: to measure how far a box is, use a touch sensor. (a) True (b) False
37. 37.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
38. 38.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
39. 39.Which job needs a touch sensor? (a) warn if motors get hot (b) measure how far a box is (c) stop before a wall (d) know a button is pressed
40. 40.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to know their world (d) to be heavier

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