Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 455 · 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.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a metal door (d) a wooden box
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.Which of these suits propellers? (a) a hospital corridor (b) a long factory floor (c) a field of tall boulders (d) hovering over a roof
4. 4.🛞 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
5. 5.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
6. 6.🛞 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)? =
7. 7.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
8. 8.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) wheels (c) propellers (d) tracks
9. 9.📡 A robot is 110 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)?
10. 10.True or false: “soft snow” suits tracks. (a) False (b) True
11. 11.🔍 Which sensor helps a robot find the brightest spot? (a) a gyro sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
12. 12.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
13. 13.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
14. 14.True or false: “a hospital corridor” suits tracks. (a) True (b) False
15. 15.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) propellers (c) legs (d) wheels
16. 16.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) big (slow and strong) (d) never important
17. 17.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) tracks (c) propellers (d) wheels
18. 18.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
19. 19.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
20. 20.Which job needs a camera? (a) measure a turn angle (b) start on a hand clap (c) feel a bump into a wall (d) spot a red ball
21. 21.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
22. 22.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 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
23. 23.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 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
25. 25.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
26. 26.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
27. 27.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 180° (d) 90°
28. 28.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
29. 29.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) propellers (c) wheels (d) legs
30. 30.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
31. 31.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
32. 32.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
34. 34.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 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 right (c) curves to the left
36. 36.⚙️ 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
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
38. 38.🧭 A robot faces north. It does: turn right, turn around, turn around, turn around. Which way does it face now? (a) north (b) east (c) south (d) west
39. 39.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) sound too high to hear (c) radio music (d) water drops
40. 40.🧭 A robot faces east. It does: turn around, turn around. Which way does it face now? (a) west (b) north (c) south (d) east

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids