Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 792 · 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’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 180°. It turns right 135°, then right 120°. What does the gyro read now (0° to 359°)?
2. 2.⚙️ 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 big driver gear (b) a small driver gear
3. 3.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
4. 4.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
5. 5.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) slower but stronger (d) at the same speed
6. 6.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
7. 7.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its diameter (c) its weight (d) its circumference
8. 8.🧭 A robot should turn right 180°, but its gyro shows it turned 166°. How many degrees must it turn more to the right?
9. 9.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times bigger (c) 3 times louder (d) 3 times faster
10. 10.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
11. 11.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 80. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
14. 14.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a gyro sensor (c) a light sensor (d) a touch sensor
15. 15.🦾 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 up and left (b) points left (c) points straight up (d) points up and right
16. 16.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) propellers (c) tracks (d) wheels
17. 17.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
18. 18.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) fast and easy on floors (d) they float
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 85. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
20. 20.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) teeth (c) pins (d) spokes
21. 21.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 47. What is under the sensor? (a) the black line (b) the white floor
22. 22.🧭 A robot spins 60° every second. How many seconds does it take to turn 300°?
23. 23.🧭 A robot spins 30° every second. How many seconds does it take to turn 330°?
24. 24.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
25. 25.Which of these suits propellers? (a) hovering over a roof (b) a flat road (c) crossing stepping-stones (d) a long factory floor
26. 26.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
27. 27.🧭 A robot faces south. It does: turn around, turn left, turn around, turn right. Which way does it face now? (a) south (b) east (c) west (d) north
28. 28.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
30. 30.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
31. 31.🛞 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 12 times. How far does the robot roll (in cm)?
32. 32.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
33. 33.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 37. What is under the sensor? (a) the black line (b) the white floor
34. 34.🛞 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 forward. What does the robot do? (a) spins right on the spot (b) spins left on the spot (c) stays still (d) turns left
35. 35.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
36. 36.⚙️ 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 small driver gear (b) a big driver gear
37. 37.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
38. 38.Which of these suits wheels? (a) stepping over wide gaps (b) loose sand dunes (c) crossing stepping-stones (d) a long factory floor
39. 39.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🧭 A robot faces north. It does: turn left, turn around, turn around. Which way does it face now? (a) south (b) north (c) east (d) west

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