Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 639 · 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 big gear drives a small gear. The small gear turns … (a) not at all (b) faster but weaker (c) slower but stronger (d) at the same speed
2. 2.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times bigger (d) 3 times faster
3. 3.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
4. 4.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a gyro sensor (c) a distance sensor (d) a touch sensor
5. 5.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) tyres (c) teeth (d) pins
6. 6.🔍 Which sensor helps a robot read a QR code? (a) a sound sensor (b) a distance sensor (c) a camera (d) a temperature sensor
7. 7.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
8. 8.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a sound sensor (c) a touch sensor (d) a gyro sensor
9. 9.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
10. 10.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 2 seconds (in cm)?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
14. 14.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
15. 15.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) tracks (c) legs (d) propellers
16. 16.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
17. 17.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
18. 18.🧭 A robot should turn right 180°, but its gyro shows it turned 189°. How many degrees must it turn back to the left?
19. 19.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 28. What is under the sensor? (a) the black line (b) the white floor
20. 20.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
21. 21.🧭 A robot faces east. It does: turn left, turn left. Which way does it face now? (a) west (b) south (c) east (d) north
22. 22.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) faster (d) slower
23. 23.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) propellers (c) legs (d) wheels
24. 24.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
25. 25.📡 A robot is 300 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 21 seconds (in cm)?
26. 26.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) tyre (d) driven gear
27. 27.Which job needs a distance sensor? (a) measure how far a box is (b) spot a red ball (c) know a button is pressed (d) follow a black line
28. 28.🔍 Which sensor helps a robot know a button is pressed? (a) a camera (b) a gyro sensor (c) a touch sensor (d) a distance sensor
29. 29.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
30. 30.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
32. 32.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) big (slow and strong) (c) never important (d) zero
33. 33.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
35. 35.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its diameter (d) its circumference
36. 36.Which job needs a sound sensor? (a) spot a red ball (b) feel a bump into a wall (c) know a button is pressed (d) start on a hand clap
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
38. 38.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.🧭 A robot should turn right 90°, but its gyro shows it turned 99°. How many degrees must it turn back to the left?
40. 40.📡 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) No (b) Yes

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