Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 859 · 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 light sensor reads below 60 over a black line and above 60 over the white floor. It reads 50. What is under the sensor? (a) the black line (b) the white floor
2. 2.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
3. 3.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
4. 4.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 1 km (d) 34 cm
5. 5.🔍 Which sensor helps a robot spot a red ball? (a) a gyro sensor (b) a camera (c) a distance sensor (d) a temperature sensor
6. 6.📡 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?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
8. 8.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) not at all (c) slower but stronger (d) at the same speed
9. 9.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 19. What is under the sensor? (a) the white floor (b) the black line
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
11. 11.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) wheels (c) tracks (d) propellers
12. 12.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.🧭 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 120°, then right 30°. What does the gyro read now (0° to 359°)?
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
15. 15.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
17. 17.🔍 Which sensor helps a robot stop before a wall? (a) a sound sensor (b) a distance sensor (c) a camera (d) a light sensor
18. 18.🛞 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) goes straight back (b) spins right on the spot (c) turns right (d) stays still
19. 19.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
22. 22.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) they never tire (d) harder to balance
23. 23.Which job needs a distance sensor? (a) follow a black line (b) spot a red ball (c) hear a whistle (d) measure how far a box is
24. 24.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) teeth (d) pins
25. 25.⚙️ A motor makes 240 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
26. 26.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
27. 27.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
28. 28.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
30. 30.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) wheel size (c) number of gears (d) driver teeth
31. 31.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
32. 32.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
34. 34.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
35. 35.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 27 times. How many times does the driven gear turn?
36. 36.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
37. 37.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) they look funny (d) fast and easy on floors
38. 38.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
39. 39.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
40. 40.🧭 A robot spins 30° every second. How many seconds does it take to turn 180°?

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