Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 441 · 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.⚙️ An 8-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
2. 2.Which job needs a distance sensor? (a) warn if motors get hot (b) find the brightest spot (c) know a button is pressed (d) stop before a wall
3. 3.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
6. 6.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) faster (d) slower
7. 7.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 22/7 (c) 2/7 (d) 7/22
8. 8.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 360° (c) 180° (d) 90°
9. 9.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.🛞 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) turns right (b) goes straight back (c) goes straight forward (d) spins right on the spot
11. 11.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
12. 12.📡 A robot is 300 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 13 seconds (in cm)?
13. 13.🧭 A robot faces east. It does: turn right, turn right, turn left, turn around. Which way does it face now? (a) west (b) south (c) north (d) east
14. 14.Which job needs a camera? (a) start on a hand clap (b) spot a red ball (c) warn if motors get hot (d) feel a bump into a wall
15. 15.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
16. 16.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 85. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
18. 18.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
19. 19.🧭 A robot faces east. It does: turn right, turn around, turn around. Which way does it face now? (a) south (b) west (c) east (d) north
20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
21. 21.Which of these suits propellers? (a) flying over a field (b) a hospital corridor (c) crossing stepping-stones (d) a long factory floor
22. 22.Which of these suits legs? (a) moving under water (b) stepping over wide gaps (c) a flat road (d) a muddy building site
23. 23.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
24. 24.Which job needs a distance sensor? (a) find the brightest spot (b) spot a red ball (c) feel a bump into a wall (d) measure how far a box is
25. 25.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) harder to balance (c) too fast on floors (d) they are too cheap
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
27. 27.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 36. What is under the sensor? (a) the white floor (b) the black line
28. 28.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
29. 29.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
30. 30.📡 A robot is 280 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)?
31. 31.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
32. 32.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
33. 33.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) wheels (c) propellers (d) legs
34. 34.True or false: to know a button is pressed, use a gyro sensor. (a) True (b) False
35. 35.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) tracks (c) propellers (d) legs
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
37. 37.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 550 cm?
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.True or false: to warn if motors get hot, use a camera. (a) False (b) True
40. 40.Which job needs a light sensor? (a) warn if motors get hot (b) start on a hand clap (c) find the brightest spot (d) stop before a wall

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