Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 894 · 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 20 over black and 80 over white. A good threshold is halfway between them. What is it?
2. 2.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) it uses a sail (d) one wheel runs faster
3. 3.🔍 Which sensor helps a robot feel a bump into a wall? (a) a light sensor (b) a camera (c) a distance sensor (d) a touch sensor
4. 4.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
5. 5.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
6. 6.⚙️ A 15-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
7. 7.🧭 A robot faces east. It does: turn left, turn right, turn left. Which way does it face now? (a) west (b) east (c) south (d) north
8. 8.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
9. 9.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 5. What is under the sensor? (a) the black line (b) the white floor
10. 10.⚙️ A 10-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
11. 11.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
13. 13.🔍 Which sensor helps a robot spot a red ball? (a) a temperature sensor (b) a camera (c) a light sensor (d) a distance sensor
14. 14.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 22. What is under the sensor? (a) the black line (b) the white floor
15. 15.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
16. 16.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
17. 17.🛞 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) goes straight forward (b) turns left (c) spins left on the spot (d) spins right on the spot
18. 18.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) turn by exact angles (d) see colours
19. 19.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
20. 20.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a track (c) a servo (d) a gear
21. 21.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) wheels (c) propellers (d) legs
22. 22.True or false: “a hospital corridor” suits wheels. (a) True (b) False
23. 23.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times slower (d) 3 times bigger
24. 24.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
25. 25.Which of these suits wheels? (a) moving under water (b) a flat road (c) deep mud (d) a muddy building site
26. 26.🔍 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
27. 27.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
28. 28.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
29. 29.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
30. 30.🔢 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)
31. 31.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
32. 32.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 43. What is under the sensor? (a) the black line (b) the white floor
34. 34.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) tracks (c) wheels (d) legs
35. 35.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
36. 36.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
37. 37.⚙️ A motor makes 270 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
38. 38.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
40. 40.🧭 A robot faces west. It does: turn around, turn right. Which way does it face now? (a) west (b) south (c) north (d) east

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