Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 961 · 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 28 cm. Using π = 22/7, how many full turns must they make to roll 616 cm?
2. 2.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
4. 4.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its circumference (c) its radius (d) its diameter
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
6. 6.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is wet (d) black is hot
7. 7.🧭 A robot spins 15° every second. How many seconds does it take to turn 135°?
8. 8.🧭 A robot faces east. It does: turn right, turn right, turn right. Which way does it face now? (a) south (b) west (c) east (d) north
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a caster wheel (c) a track (d) a servo
11. 11.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
12. 12.⚙️ 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
13. 13.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
14. 14.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
15. 15.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) sound too high to hear (c) water drops (d) radio music
16. 16.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a metal door (d) a wooden box
17. 17.🔍 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
18. 18.Which job needs a light sensor? (a) warn if motors get hot (b) stay balanced upright (c) measure a turn angle (d) find the brightest spot
19. 19.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) tracks (c) wheels (d) legs
20. 20.📡 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 8 seconds (in cm)?
21. 21.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
22. 22.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) it uses a sail (d) one wheel runs faster
23. 23.⚙️ A 36-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
24. 24.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
25. 25.🧭 A robot should turn right 45°, but its gyro shows it turned 36°. How many degrees must it turn more to the right?
26. 26.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
28. 28.📡 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 6 seconds (in cm)?
29. 29.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 70. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
31. 31.📡 A robot is 240 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
32. 32.True or false: to read a QR code, use a camera. (a) False (b) True
33. 33.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 360° (d) 90°
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
35. 35.Which job needs a touch sensor? (a) stay balanced upright (b) warn if motors get hot (c) feel a bump into a wall (d) spot a red ball
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
38. 38.⚙️ A motor makes 200 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
39. 39.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spin in the air (c) they are round (d) they spread the weight
40. 40.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only

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