Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 695 · 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 faces east. It does: turn right, turn right, turn right, turn around. Which way does it face now? (a) north (b) east (c) west (d) south
2. 2.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 360° (d) 100°
3. 3.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 90° (d) 45°
4. 4.🔍 What does a gyro sensor measure? (a) temperature (b) sound (c) turning (rotation) (d) colour
5. 5.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 9. What is under the sensor? (a) the white floor (b) the black line
6. 6.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
7. 7.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) backwards (c) nowhere (d) faster
8. 8.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
10. 10.📡 A robot is 100 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 14 seconds (in cm)?
11. 11.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
13. 13.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 32. What is under the sensor? (a) the black line (b) the white floor
14. 14.📡 A robot is 140 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)?
15. 15.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 64. What is under the sensor? (a) the white floor (b) the black line
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
17. 17.🧭 What does a gyro help a robot do? (a) hear claps (b) turn by exact angles (c) smell smoke (d) see colours
18. 18.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
19. 19.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 462 cm?
20. 20.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) stays still (d) goes straight back
21. 21.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
22. 22.⚙️ An 8-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
23. 23.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
25. 25.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) black (d) the sky
26. 26.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
28. 28.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
29. 29.True or false: to stop before a wall, use a distance sensor. (a) True (b) False
30. 30.True or false: “a flat road” suits wheels. (a) True (b) False
31. 31.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a sound sensor
32. 32.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a servo (c) a gear (d) a track
33. 33.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 20. What is under the sensor? (a) the black line (b) the white floor
34. 34.⚙️ 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
35. 35.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
36. 36.🧭 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 135°, then right 90°. What does the gyro read now (0° to 359°)?
37. 37.🧭 A robot should turn right 180°, but its gyro shows it turned 176°. How many degrees must it turn more to the right?
38. 38.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
39. 39.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) faster but weaker (d) not at all
40. 40.🧭 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 0°. It turns left 45°, then left 120°. What does the gyro read now (0° to 359°)?

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