Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 775 · 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.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
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 is stopped. What does the robot do? (a) stays still (b) goes straight back (c) spins right on the spot (d) turns left
3. 3.🧭 What does a gyro help a robot do? (a) smell smoke (b) turn by exact angles (c) see colours (d) hear claps
4. 4.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
5. 5.Which of these suits wheels? (a) hovering over a roof (b) crossing stepping-stones (c) deep mud (d) a smooth classroom floor
6. 6.True or false: “a hospital corridor” suits tracks. (a) True (b) False
7. 7.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
8. 8.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
9. 9.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
10. 10.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🧭 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 90°. It turns left 90°, then right 60°. What does the gyro read now (0° to 359°)?
13. 13.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
15. 15.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
16. 16.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
17. 17.True or false: to follow a black line, use a camera. (a) False (b) True
18. 18.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a temperature sensor (c) a gyro sensor (d) a light sensor
19. 19.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
20. 20.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
22. 22.🛞 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 backward. What does the robot do? (a) turns right (b) goes straight back (c) spins left on the spot (d) turns left
23. 23.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
24. 24.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
25. 25.🛞 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) goes straight back (c) stays still (d) turns right
26. 26.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
27. 27.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
28. 28.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 45° (d) 360°
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
30. 30.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
31. 31.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they spin in the air (c) they are round (d) they are shiny
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 80. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
34. 34.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 550 cm?
35. 35.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a touch sensor (c) a sound sensor (d) a gyro sensor
36. 36.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 25. What is under the sensor? (a) the black line (b) the white floor
37. 37.Which job needs a temperature sensor? (a) warn if motors get hot (b) measure how far a box is (c) follow a black line (d) start on a hand clap
38. 38.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) tyre (d) driver gear
39. 39.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero

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