Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 633 · 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 wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
3. 3.🧭 What does a gyro help a robot do? (a) hear claps (b) see colours (c) turn by exact angles (d) smell smoke
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
6. 6.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
7. 7.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
8. 8.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the top speed (d) the black/white cut-off
9. 9.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
10. 10.Which job needs a gyro sensor? (a) hear a whistle (b) read a QR code (c) measure a turn angle (d) spot a red ball
11. 11.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
12. 12.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) temperature (d) turning (rotation)
13. 13.🧭 A robot faces north. It does: turn right, turn around. Which way does it face now? (a) east (b) north (c) south (d) west
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🔍 Which sensor helps a robot measure how far a box is? (a) a sound sensor (b) a light sensor (c) a gyro sensor (d) a distance sensor
16. 16.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
19. 19.True or false: “a flat road” suits legs. (a) False (b) True
20. 20.🔍 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
21. 21.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
22. 22.⚙️ A 16-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
23. 23.True or false: “a flat road” suits wheels. (a) False (b) True
24. 24.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
25. 25.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
26. 26.🛞 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) spins right on the spot (b) turns right (c) turns left (d) stays still
27. 27.⚙️ An 8-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
28. 28.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times louder (d) 3 times slower
29. 29.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
30. 30.🛞 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 backward. What does the robot do? (a) spins right on the spot (b) goes straight forward (c) turns left (d) goes straight back
31. 31.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
32. 32.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a caster wheel (d) a track
33. 33.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
34. 34.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
35. 35.True or false: to stop before a wall, use a sound sensor. (a) True (b) False
36. 36.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
37. 37.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 34 cm (d) 3 cm
38. 38.📡 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
39. 39.True or false: to start on a hand clap, use a sound sensor. (a) False (b) True
40. 40.🧭 A robot spins 90° every second. How many seconds does it take to turn 180°?

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