Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 474 · 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: to spot a red ball, use a light sensor. (a) False (b) True
2. 2.🛞 Circumference = π × … (a) radius only (b) weight (c) diameter (d) speed
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
4. 4.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) water (d) the sky
5. 5.🧭 A robot should turn right 45°, but its gyro shows it turned 46°. How many degrees must it turn back to the left?
6. 6.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
7. 7.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
9. 9.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) spokes (d) teeth
10. 10.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
11. 11.Which of these suits wheels? (a) a smooth classroom floor (b) deep mud (c) a field of tall boulders (d) soft snow
12. 12.Which of these suits legs? (a) a long factory floor (b) a smooth classroom floor (c) crossing stepping-stones (d) a muddy building site
13. 13.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the right sensor (c) between the two sensors (d) under the left sensor
14. 14.🧭 A robot faces east. It does: turn right, turn right, turn right, turn right. Which way does it face now? (a) east (b) west (c) south (d) north
15. 15.⚙️ A motor makes 200 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
16. 16.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) big (slow and strong) (d) small (fast, weak)
17. 17.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🧭 A robot faces north. It does: turn right, turn left. Which way does it face now? (a) west (b) south (c) north (d) east
19. 19.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
20. 20.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black is hot (d) black soaks up light
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
24. 24.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) the sensor is half (c) sound is slow (d) it goes there and back
25. 25.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
26. 26.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
27. 27.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) slower but stronger (c) faster and weaker (d) not at all
28. 28.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a cow (d) a snail
29. 29.🧭 A robot faces west. It does: turn around, turn left. Which way does it face now? (a) west (b) east (c) south (d) north
30. 30.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
31. 31.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
32. 32.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
33. 33.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a touch sensor (c) a temperature sensor (d) a light sensor
34. 34.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
35. 35.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a wooden box (c) a metal door (d) a flat wall
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
37. 37.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
38. 38.🛞 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 left (b) turns right (c) spins right on the spot (d) goes straight forward
39. 39.Which job needs a sound sensor? (a) read a QR code (b) warn if motors get hot (c) start on a hand clap (d) spot a red ball
40. 40.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?

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