Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 831 · 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 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)?
2. 2.🛞 Circumference = π × … (a) speed (b) diameter (c) radius only (d) weight
3. 3.🛞 Which way of moving suits this best: “hovering over a roof”? (a) propellers (b) tracks (c) wheels (d) legs
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
5. 5.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) an output (d) a wheel
6. 6.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
7. 7.Which of these suits propellers? (a) a long factory floor (b) deep mud (c) flying over a field (d) crossing stepping-stones
8. 8.⚙️ A motor makes 360 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
9. 9.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) tyre (c) idler gear (d) driven gear
10. 10.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
11. 11.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
12. 12.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
13. 13.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
14. 14.🧭 A robot spins 15° every second. How many seconds does it take to turn 90°?
15. 15.True or false: “deep mud” suits wheels. (a) False (b) True
16. 16.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
18. 18.🧭 A robot faces north. It does: turn around, turn around, turn left. Which way does it face now? (a) east (b) north (c) west (d) south
19. 19.📡 A robot is 190 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 12 seconds (in cm)?
20. 20.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
23. 23.🛞 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) goes straight back (b) goes straight forward (c) turns right (d) spins right on the spot
24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
25. 25.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
26. 26.🛞 Which way of moving suits this best: “moving under water”? (a) wheels (b) tracks (c) legs (d) propellers
27. 27.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
28. 28.True or false: to measure how far a box is, use a light sensor. (a) False (b) True
29. 29.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
30. 30.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
31. 31.📡 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)?
32. 32.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times slower (d) 3 times louder
33. 33.Which of these suits propellers? (a) a muddy building site (b) moving under water (c) a field of tall boulders (d) soft snow
34. 34.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a bat (d) a snail
35. 35.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22/7 (d) 22
36. 36.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 90. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
38. 38.⚙️ 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 small driver gear (b) a big driver gear
39. 39.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spin in the air (c) they spread the weight (d) they are round
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right

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