Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 834 · 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 arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
2. 2.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is loud (d) black is wet
3. 3.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
4. 4.📡 A robot is 120 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
5. 5.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
6. 6.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) between the two sensors (d) under the right sensor
8. 8.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
9. 9.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
10. 10.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
11. 11.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.Which job needs a light sensor? (a) read a QR code (b) know a button is pressed (c) follow a black line (d) spot a red ball
13. 13.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
14. 14.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
15. 15.🛞 Circumference = π × … (a) weight (b) radius only (c) speed (d) diameter
16. 16.🧭 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 left 180°, then left 90°, then left 90°. What does the gyro read now (0° to 359°)?
17. 17.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
18. 18.Which job needs a sound sensor? (a) measure how far a box is (b) spot a red ball (c) hear a whistle (d) know a button is pressed
19. 19.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a black surface (d) a white surface
20. 20.⚙️ 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
21. 21.True or false: to measure a turn angle, use a touch sensor. (a) False (b) True
22. 22.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
23. 23.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
24. 24.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points left (b) points right (c) points up and right (d) points up and left
25. 25.Which of these suits propellers? (a) a hospital corridor (b) soft snow (c) deep mud (d) flying over a field
26. 26.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
27. 27.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
28. 28.Which of these suits wheels? (a) loose sand dunes (b) a flat road (c) a field of tall boulders (d) a muddy building site
29. 29.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) a wheel (d) an input
30. 30.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 360° (d) 90°
31. 31.Which of these suits propellers? (a) deep mud (b) soft snow (c) a smooth classroom floor (d) moving under water
32. 32.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
33. 33.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
34. 34.🛞 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 forward. What does the robot do? (a) goes straight forward (b) goes straight back (c) spins left on the spot (d) spins right on the spot
35. 35.Which of these suits tracks? (a) moving under water (b) a muddy building site (c) hovering over a roof (d) crossing stepping-stones
36. 36.Which of these suits tracks? (a) stepping over wide gaps (b) a field of tall boulders (c) a long factory floor (d) deep mud
37. 37.True or false: to know a button is pressed, use a distance sensor. (a) True (b) False
38. 38.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) not at all (c) at the same speed (d) slower but stronger
39. 39.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) motor volts (d) number of gears
40. 40.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?

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