Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 927 · 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.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a light sensor (c) a distance sensor (d) a camera
2. 2.Which job needs a light sensor? (a) follow a black line (b) read a QR code (c) measure a turn angle (d) start on a hand clap
3. 3.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.Which job needs a touch sensor? (a) find the brightest spot (b) know a button is pressed (c) start on a hand clap (d) measure a turn angle
6. 6.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) wheels (c) tracks (d) legs
7. 7.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
8. 8.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
9. 9.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black soaks up light (d) black is loud
10. 10.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) never important (d) small (fast, weak)
11. 11.🦾 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 right (b) points left (c) points up and left (d) points straight up
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
14. 14.🔍 Why do robots need sensors? (a) to know their world (b) to look colourful (c) to use more power (d) to be heavier
15. 15.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
16. 16.Which job needs a distance sensor? (a) follow a black line (b) spot a red ball (c) start on a hand clap (d) measure how far a box is
17. 17.True or false: “stepping over wide gaps” suits wheels. (a) False (b) True
18. 18.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) slower but stronger (d) not at all
19. 19.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
20. 20.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
21. 21.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 26. What is under the sensor? (a) the black line (b) the white floor
22. 22.True or false: to stop before a wall, use a light sensor. (a) True (b) False
23. 23.🛞 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) stays still (c) turns right (d) goes straight forward
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
26. 26.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) it jumps (d) one wheel runs faster
27. 27.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the left sensor (d) under the right sensor
28. 28.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🧭 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 right 135°, then left 180°. What does the gyro read now (0° to 359°)?
30. 30.True or false: “soft snow” suits wheels. (a) True (b) False
31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
32. 32.🔦 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 white floor (b) the black line
33. 33.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
34. 34.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
36. 36.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
37. 37.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
39. 39.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
40. 40.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False

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