Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 897 · 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.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
2. 2.🔍 Which sensor helps a robot measure a turn angle? (a) a light sensor (b) a camera (c) a gyro sensor (d) a touch sensor
3. 3.🧭 A robot should turn right 90°, but its gyro shows it turned 93°. How many degrees must it turn back to the left?
4. 4.🦾 A servo moves from 130° to 180°. How many degrees does it turn?
5. 5.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) tracks (c) wheels (d) propellers
6. 6.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
7. 7.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
8. 8.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
9. 9.True or false: to measure a turn angle, use a sound sensor. (a) False (b) True
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.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
12. 12.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
13. 13.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns left 30°, then right 90°, then left 90°. What does the gyro read now (0° to 359°)?
14. 14.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a metal door (c) a wooden box (d) a soft foam cushion
16. 16.Which job needs a camera? (a) stay balanced upright (b) feel a bump into a wall (c) spot a red ball (d) find the brightest spot
17. 17.Which job needs a gyro sensor? (a) spot a red ball (b) find the brightest spot (c) feel a bump into a wall (d) stay balanced upright
18. 18.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
19. 19.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the battery size (d) the black/white cut-off
20. 20.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
21. 21.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 180° (c) 45° (d) 90°
22. 22.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 308 cm?
23. 23.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns right 30°, then right 45°. What does the gyro read now (0° to 359°)?
25. 25.True or false: to measure how far a box is, use a distance sensor. (a) True (b) False
26. 26.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.True or false: “hovering over a roof” suits wheels. (a) True (b) False
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 10. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
29. 29.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
30. 30.True or false: “loose sand dunes” suits tracks. (a) True (b) False
31. 31.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times bigger (d) 3 times slower
33. 33.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) the sensor is half (d) it goes there and back
34. 34.Which job needs a temperature sensor? (a) measure a turn angle (b) warn if motors get hot (c) feel a bump into a wall (d) follow a black line
35. 35.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
36. 36.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 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
38. 38.🧭 A robot spins 15° every second. How many seconds does it take to turn 75°?
39. 39.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
40. 40.🛞 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 forward (b) stays still (c) goes straight back (d) turns right

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