Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 774 · 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 is 100 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 4 seconds (in cm)?
2. 2.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
3. 3.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 70. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
5. 5.True or false: to measure how far a box is, use a sound sensor. (a) True (b) False
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
7. 7.🧭 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 left 90°, then right 90°. What does the gyro read now (0° to 359°)?
8. 8.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 19 seconds (in cm)?
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
12. 12.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
13. 13.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
14. 14.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.Which job needs a camera? (a) feel a bump into a wall (b) stay balanced upright (c) find the brightest spot (d) read a QR code
16. 16.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 90. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
17. 17.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) legs (c) tracks (d) wheels
18. 18.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 880 cm?
19. 19.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
20. 20.🧭 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 270°. It turns right 60°, then right 45°, then left 120°. What does the gyro read now (0° to 359°)?
21. 21.True or false: to warn if motors get hot, use a touch sensor. (a) True (b) False
22. 22.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
24. 24.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.Which of these suits wheels? (a) crossing stepping-stones (b) soft snow (c) a long factory floor (d) a muddy building site
26. 26.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black soaks up light (d) black is hot
27. 27.🛞 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) stays still (b) goes straight back (c) spins left on the spot (d) spins right on the spot
28. 28.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
29. 29.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
30. 30.Which job needs a light sensor? (a) read a QR code (b) stop before a wall (c) measure how far a box is (d) follow a black line
31. 31.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
32. 32.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
33. 33.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
34. 34.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
36. 36.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
37. 37.True or false: to stop before a wall, use a distance sensor. (a) True (b) False
38. 38.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 462 cm?
39. 39.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
40. 40.Which job needs a gyro sensor? (a) read a QR code (b) measure a turn angle (c) know a button is pressed (d) measure how far a box is

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