Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 69 · 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 of these suits propellers? (a) a long factory floor (b) flying over a field (c) a field of tall boulders (d) stepping over wide gaps
2. 2.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they climb stairs (d) they look funny
3. 3.📡 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)?
4. 4.🔍 Why do robots need sensors? (a) to use more power (b) to be heavier (c) to look colourful (d) to know their world
5. 5.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
7. 7.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 47. What is under the sensor? (a) the black line (b) the white floor
8. 8.🧭 A robot faces east. It does: turn around, turn right. Which way does it face now? (a) east (b) west (c) south (d) north
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
11. 11.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) teeth (c) spokes (d) pins
13. 13.📡 A robot is 270 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
14. 14.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
15. 15.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) sound is slow (c) the sensor is half (d) to make it smaller
16. 16.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 52. What is under the sensor? (a) the white floor (b) the black line
18. 18.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
19. 19.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) wheel size (d) motor volts
20. 20.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
22. 22.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 95. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
23. 23.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
24. 24.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
25. 25.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
27. 27.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
28. 28.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
29. 29.🛞 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 left (b) stays still (c) spins left on the spot (d) goes straight forward
30. 30.True or false: “a hospital corridor” suits tracks. (a) False (b) True
31. 31.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
33. 33.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
36. 36.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 35 times. How many times does the driven gear turn?
37. 37.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
38. 38.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
39. 39.📡 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)?
40. 40.True or false: to read a QR code, use a sound sensor. (a) True (b) False

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