Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 684 · 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: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
3. 3.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a touch sensor (c) a gyro sensor (d) a sound sensor
4. 4.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
5. 5.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
6. 6.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 360° (d) 100°
7. 7.Which job needs a camera? (a) start on a hand clap (b) read a QR code (c) find the brightest spot (d) know a button is pressed
8. 8.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
9. 9.🧭 A robot spins 15° every second. How many seconds does it take to turn 360°?
10. 10.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
11. 11.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spin in the air (c) they are round (d) they spread the weight
12. 12.⚙️ 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
13. 13.Which job needs a temperature sensor? (a) spot a red ball (b) warn if motors get hot (c) read a QR code (d) measure how far a box is
14. 14.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a gyro sensor (c) a camera (d) a sound sensor
15. 15.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
16. 16.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a gear (d) a servo
17. 17.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
18. 18.🧭 A robot should turn right 90°, but its gyro shows it turned 100°. How many degrees must it turn back to the left?
19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
20. 20.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
21. 21.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 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
22. 22.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) pins (c) tyres (d) teeth
23. 23.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) tyre (d) driver gear
24. 24.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 19. What is under the sensor? (a) the black line (b) the white floor
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
27. 27.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to look colourful (d) to use more power
28. 28.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.🧭 A robot should turn right 90°, but its gyro shows it turned 78°. How many degrees must it turn more to the right?
30. 30.🧭 A robot spins 30° every second. How many seconds does it take to turn 210°?
31. 31.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 40
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 95. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
33. 33.True or false: “a flat road” suits wheels. (a) False (b) True
34. 34.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
35. 35.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
36. 36.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a white surface (d) a black line
37. 37.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) smell smoke (d) turn by exact angles
38. 38.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) sound is slow (d) it goes there and back
39. 39.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
40. 40.⚙️ A 15-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower

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