Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 424 · 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 robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.🔍 Which sensor helps a robot measure how far a box is? (a) a distance sensor (b) a touch sensor (c) a sound sensor (d) a light sensor
3. 3.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
4. 4.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
5. 5.True or false: “a hospital corridor” suits tracks. (a) False (b) True
6. 6.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points straight up (b) points up and right (c) points left (d) points right
7. 7.📡 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
8. 8.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
9. 9.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
12. 12.Which job needs a light sensor? (a) find the brightest spot (b) feel a bump into a wall (c) start on a hand clap (d) hear a whistle
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) spins left on the spot (b) turns left (c) stays still (d) spins right on the spot
14. 14.🛞 Circumference = π × … (a) radius only (b) weight (c) diameter (d) speed
15. 15.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
16. 16.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 22/7 (c) 7/22 (d) 2/7
17. 17.Which of these suits wheels? (a) loose sand dunes (b) a long factory floor (c) a muddy building site (d) stepping over wide gaps
18. 18.🧭 A robot faces east. It does: turn right, turn left, turn right, turn right. Which way does it face now? (a) south (b) east (c) north (d) west
19. 19.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
20. 20.📡 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)?
21. 21.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 90° (d) 360°
22. 22.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 10. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
24. 24.🔍 Which sensor helps a robot follow a black line? (a) a touch sensor (b) a light sensor (c) a distance sensor (d) a camera
25. 25.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
27. 27.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
28. 28.Which job needs a temperature sensor? (a) warn if motors get hot (b) know a button is pressed (c) measure a turn angle (d) read a QR code
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 0°. It turns left 45°, then right 120°. What does the gyro read now (0° to 359°)?
30. 30.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
31. 31.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
32. 32.⬛ The threshold of a light sensor is … (a) the wheel size (b) the black/white cut-off (c) the top speed (d) the battery size
33. 33.Which job needs a distance sensor? (a) read a QR code (b) know a button is pressed (c) measure how far a box is (d) spot a red ball
34. 34.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 10
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 85. What is under the sensor? (a) the black line (b) the white floor
36. 36.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) propellers (c) tracks (d) legs
37. 37.📡 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)?
38. 38.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 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 left (c) curves to the right
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
40. 40.🔦 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

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