Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 155 · 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 stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
2. 2.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
3. 3.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
4. 4.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a black line (d) a white surface
5. 5.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
6. 6.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a bat (d) a goldfish
7. 7.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) a gear (c) an output (d) an input
8. 8.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 70. What is under the sensor? (a) the white floor (b) the black line
9. 9.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
10. 10.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
11. 11.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a wooden box (c) a flat wall (d) a soft foam cushion
12. 12.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
14. 14.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
15. 15.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
16. 16.🧭 A robot faces south. It does: turn right, turn around, turn left, turn around. Which way does it face now? (a) east (b) north (c) south (d) west
17. 17.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
18. 18.📡 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)?
19. 19.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
20. 20.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
21. 21.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
22. 22.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
23. 23.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its weight (d) its radius
24. 24.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a touch sensor
25. 25.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 45° (d) 360°
26. 26.🧭 A robot should turn right 90°, but its gyro shows it turned 104°. How many degrees must it turn back to the left?
27. 27.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) slower but stronger (c) not at all (d) at the same speed
28. 28.Which of these suits propellers? (a) loose sand dunes (b) stepping over wide gaps (c) a long factory floor (d) moving under water
29. 29.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
30. 30.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
31. 31.Which of these suits legs? (a) a smooth classroom floor (b) a field of tall boulders (c) soft snow (d) a muddy building site
32. 32.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
33. 33.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
34. 34.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 340 cm (c) 34 cm (d) 1 km
35. 35.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
36. 36.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
37. 37.🔍 Which sensor helps a robot read a QR code? (a) a distance sensor (b) a gyro sensor (c) a camera (d) a touch sensor
38. 38.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) goes straight back (b) spins right on the spot (c) goes straight forward (d) turns right
39. 39.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
40. 40.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22/7 (c) 2/7 (d) 22

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