Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 596 · 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 job needs a temperature sensor? (a) measure how far a box is (b) find the brightest spot (c) stay balanced upright (d) warn if motors get hot
2. 2.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
3. 3.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
4. 4.🦾 A servo program runs:
   angle = 60
   angle = angle + 40
   angle = angle − 30
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
5. 5.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 360° (d) 45°
6. 6.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
7. 7.🛞 Which way of moving suits this best: “hovering over a roof”? (a) wheels (b) legs (c) tracks (d) propellers
8. 8.⚙️ 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
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.🧭 A robot faces north. It does: turn right, turn left. Which way does it face now? (a) west (b) south (c) north (d) east
12. 12.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
14. 14.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 45. What is under the sensor? (a) the white floor (b) the black line
15. 15.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
16. 16.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a gyro sensor (c) a touch sensor (d) a camera
17. 17.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) not at all (c) at the same speed (d) slower but stronger
18. 18.🛞 Circumference = π × … (a) speed (b) diameter (c) weight (d) radius only
19. 19.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
20. 20.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
21. 21.True or false: to read a QR code, use a gyro sensor. (a) False (b) True
22. 22.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
23. 23.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.📡 A robot is 100 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)?
25. 25.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 100° (d) 90°
26. 26.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) sound is slow (c) the sensor is half (d) to make it smaller
27. 27.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) zero (d) small (fast, weak)
28. 28.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a light sensor (c) a touch sensor (d) a camera
29. 29.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) far behind it (d) under the right sensor
30. 30.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
31. 31.⚙️ A 30-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
32. 32.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) tyre (c) driven gear (d) driver gear
33. 33.⚙️ A motor makes 180 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
34. 34.Which of these suits wheels? (a) a muddy building site (b) soft snow (c) crossing stepping-stones (d) a flat road
35. 35.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
36. 36.⚙️ A motor makes 500 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
37. 37.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a temperature sensor (c) a light sensor (d) a camera
38. 38.🛞 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) turns left (b) goes straight back (c) spins left on the spot (d) turns right
39. 39.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
40. 40.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?

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