Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 185 · 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 light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
2. 2.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 180° (d) 360°
3. 3.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a dark tunnel (d) a white surface
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
6. 6.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
7. 7.🛞 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) stays still (d) goes straight forward
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
9. 9.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
10. 10.🔍 Which sensor helps a robot feel a bump into a wall? (a) a light sensor (b) a sound sensor (c) a touch sensor (d) a distance sensor
11. 11.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
12. 12.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
13. 13.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
14. 14.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 2 seconds (in cm)?
15. 15.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
16. 16.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 57. What is under the sensor? (a) the white floor (b) the black line
18. 18.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) between the two sensors (d) under the left sensor
19. 19.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
20. 20.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 29. What is under the sensor? (a) the white floor (b) the black line
21. 21.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
22. 22.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is loud (d) black is hot
23. 23.🧭 A robot should turn right 45°, but its gyro shows it turned 52°. How many degrees must it turn back to the left?
24. 24.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
25. 25.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
26. 26.Which of these suits tracks? (a) flying over a field (b) a smooth classroom floor (c) deep mud (d) a long factory floor
27. 27.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a goldfish (d) a snail
28. 28.Which of these suits wheels? (a) deep mud (b) moving under water (c) stepping over wide gaps (d) a flat road
29. 29.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
30. 30.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 90° (c) 180° (d) 360°
31. 31.📡 A robot is 250 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
33. 33.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) water (d) the sky
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.Which of these suits wheels? (a) loose sand dunes (b) hovering over a roof (c) a field of tall boulders (d) a long factory floor
36. 36.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
37. 37.True or false: to start on a hand clap, use a camera. (a) False (b) True
38. 38.🛞 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) turns left (b) spins right on the spot (c) goes straight back (d) turns right
39. 39.🧭 A robot faces east. It does: turn right, turn around, turn left, turn right. Which way does it face now? (a) south (b) west (c) north (d) east
40. 40.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) tracks (c) propellers (d) legs

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