Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 498 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
2. 2.🛞 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 forward. What does the robot do? (a) turns right (b) goes straight back (c) goes straight forward (d) stays still
3. 3.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points up and left (c) points straight up (d) points left
4. 4.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
5. 5.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) the sky (d) water
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
7. 7.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
8. 8.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) fast and easy on floors (d) they look funny
9. 9.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a metal door (c) a wooden box (d) a flat wall
10. 10.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
12. 12.🔍 Which sensor helps a robot spot a red ball? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a camera
13. 13.🧭 A robot should turn right 90°, but its gyro shows it turned 98°. How many degrees must it turn back to the left?
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 40. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
15. 15.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
17. 17.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 550 cm?
18. 18.⚙️ 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
19. 19.Which of these suits wheels? (a) crossing stepping-stones (b) a muddy building site (c) a flat road (d) deep mud
20. 20.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
21. 21.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
22. 22.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
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.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) radio music (d) bright light
25. 25.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
26. 26.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
27. 27.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
28. 28.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
29. 29.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.🧭 A robot faces west. It does: turn right, turn right, turn right, turn right. Which way does it face now? (a) north (b) east (c) west (d) south
31. 31.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 180° (c) 45° (d) 90°
32. 32.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 28. What is under the sensor? (a) the white floor (b) the black line
33. 33.True or false: to feel a bump into a wall, use a temperature sensor. (a) False (b) True
34. 34.🦾 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 up and right (b) points right (c) points up and left (d) points left
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🔍 Which sensor helps a robot measure a turn angle? (a) a temperature sensor (b) a camera (c) a gyro sensor (d) a distance sensor
37. 37.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a white surface (d) a black surface
38. 38.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
39. 39.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 7/22 (c) 22 (d) 2/7
40. 40.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False

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