Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 874 · 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 motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns right (b) turns left (c) stays still (d) spins left on the spot
3. 3.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
4. 4.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
5. 5.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 45° (d) 90°
6. 6.🔍 Which sensor helps a robot spot a red ball? (a) a distance sensor (b) a camera (c) a temperature sensor (d) a gyro sensor
7. 7.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points left (c) points up and left (d) points up and right
8. 8.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 29. What is under the sensor? (a) the black line (b) the white floor
9. 9.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
10. 10.Which of these suits tracks? (a) moving under water (b) deep mud (c) hovering over a roof (d) a long factory floor
11. 11.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) faster and weaker (d) at the same speed
12. 12.🔍 What does a gyro sensor measure? (a) colour (b) turning (rotation) (c) temperature (d) sound
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 75. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
14. 14.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
15. 15.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
17. 17.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 79. What is under the sensor? (a) the white floor (b) the black line
18. 18.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times slower (d) 3 times bigger
19. 19.True or false: to spot a red ball, use a sound sensor. (a) False (b) True
20. 20.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) an input (d) a wheel
21. 21.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they spin in the air (d) they are shiny
22. 22.🧭 A robot should turn right 45°, but its gyro shows it turned 38°. How many degrees must it turn more to the right?
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
24. 24.🧭 A robot faces south. It does: turn left, turn around, turn left. Which way does it face now? (a) east (b) north (c) south (d) west
25. 25.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
26. 26.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and right (b) points left (c) points right (d) points up and left
27. 27.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) propellers (c) tracks (d) wheels
28. 28.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
31. 31.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
32. 32.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
33. 33.True or false: “a smooth classroom floor” suits wheels. (a) True (b) False
34. 34.🧭 A robot faces west. It does: turn right, turn left, turn left. Which way does it face now? (a) south (b) east (c) west (d) north
35. 35.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a snail (c) a cow (d) a goldfish
36. 36.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
37. 37.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
38. 38.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.⚙️ 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
40. 40.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False

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