Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 582 · 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.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
2. 2.Which of these suits wheels? (a) a muddy building site (b) moving under water (c) hovering over a roof (d) a long factory floor
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
4. 4.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
5. 5.📡 A robot is 140 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 4 seconds (in cm)?
6. 6.🛞 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) goes straight forward (c) spins left on the spot (d) stays still
7. 7.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
8. 8.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
9. 9.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they are too cheap (c) too fast on floors (d) they never tire
10. 10.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 18. What is under the sensor? (a) the white floor (b) the black line
11. 11.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
12. 12.🧭 A robot should turn right 180°, but its gyro shows it turned 182°. How many degrees must it turn back to the left?
13. 13.🦾 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 left (b) points up and left (c) points up and right (d) points straight up
14. 14.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
15. 15.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) faster and weaker (d) at the same speed
16. 16.True or false: “a smooth classroom floor” suits tracks. (a) False (b) True
17. 17.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a camera (c) a gyro sensor (d) a sound sensor
18. 18.🧭 A robot should turn right 90°, but its gyro shows it turned 98°. How many degrees must it turn back to the left?
19. 19.🛞 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 backward. What does the robot do? (a) spins right on the spot (b) turns left (c) spins left on the spot (d) goes straight back
20. 20.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
21. 21.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
23. 23.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
24. 24.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a touch sensor (d) a gyro sensor
25. 25.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) sound too high to hear (d) water drops
26. 26.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
27. 27.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
28. 28.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
31. 31.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a wheel (c) an output (d) a gear
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
33. 33.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
35. 35.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
36. 36.🧭 A robot faces west. It does: turn right, turn around, turn right, turn right. Which way does it face now? (a) south (b) east (c) north (d) west
37. 37.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
38. 38.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a metal door (d) a wooden box
39. 39.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
40. 40.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) one wheel runs faster (c) it jumps (d) it uses a sail

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