Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 489 · 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.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
2. 2.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 360° (c) 45° (d) 90°
3. 3.📡 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) Yes (b) No
4. 4.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
5. 5.📡 A robot is 170 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
6. 6.🦾 A servo moves from 10° to 50°. How many degrees does it turn?
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 270°. It turns right 120°, then right 135°. What does the gyro read now (0° to 359°)?
8. 8.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
9. 9.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
10. 10.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
11. 11.🧭 A robot faces east. It does: turn left, turn left, turn right. Which way does it face now? (a) south (b) east (c) north (d) west
12. 12.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight forward (b) turns left (c) goes straight back (d) stays still
13. 13.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) wheels (c) legs (d) tracks
16. 16.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) faster but weaker (d) not at all
17. 17.Which of these suits wheels? (a) a field of tall boulders (b) soft snow (c) a smooth classroom floor (d) flying over a field
18. 18.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) smell smoke (d) hear claps
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 180°. It turns left 120°, then left 180°. What does the gyro read now (0° to 359°)?
21. 21.🧭 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 45°, then right 120°. What does the gyro read now (0° to 359°)?
22. 22.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) tracks (c) legs (d) propellers
23. 23.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) tyres (c) spokes (d) pins
24. 24.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
25. 25.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
26. 26.📡 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
27. 27.⚙️ A motor makes 200 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
28. 28.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
30. 30.🛞 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) turns left (c) spins right on the spot (d) goes straight back
31. 31.Which job needs a gyro sensor? (a) measure a turn angle (b) measure how far a box is (c) spot a red ball (d) hear a whistle
32. 32.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points left (c) points right (d) points up and right
33. 33.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the battery size (c) the top speed (d) the wheel size
34. 34.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
35. 35.🦾 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 up and right (b) points straight up (c) points left (d) points right
36. 36.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
37. 37.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
38. 38.True or false: to find the brightest spot, use a gyro sensor. (a) True (b) False
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
40. 40.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) never important (d) small (fast, weak)

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