Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 654 · 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: “reverses if wires swap” is true of a servo motor. (a) True (b) False
2. 2.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
3. 3.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) between the two sensors (c) under the left sensor (d) under the right sensor
4. 4.True or false: to follow a black line, use a light sensor. (a) False (b) True
5. 5.Which job needs a gyro sensor? (a) feel a bump into a wall (b) warn if motors get hot (c) measure a turn angle (d) measure how far a box is
6. 6.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
7. 7.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
8. 8.🛞 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) spins left on the spot (b) spins right on the spot (c) turns left (d) goes straight back
9. 9.📡 A robot is 250 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 12 seconds (in cm)?
10. 10.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
11. 11.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) not at all (d) faster but weaker
12. 12.⚙️ A 16-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
13. 13.Which job needs a gyro sensor? (a) stay balanced upright (b) read a QR code (c) spot a red ball (d) know a button is pressed
14. 14.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
15. 15.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 95. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
18. 18.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a sound sensor (c) a camera (d) a distance sensor
19. 19.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in 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 runs forward. What does the robot do? (a) turns right (b) spins left on the spot (c) goes straight forward (d) turns left
21. 21.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
22. 22.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
23. 23.🧭 How many degrees is a full turn? (a) 360° (b) 180° (c) 100° (d) 90°
24. 24.📡 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?
25. 25.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) it jumps (d) one wheel runs faster
26. 26.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
27. 27.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
28. 28.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
29. 29.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) tracks (c) propellers (d) wheels
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
31. 31.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are round (c) they spread the weight (d) they are shiny
32. 32.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
33. 33.🛞 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 6 times. How far does the robot roll (in cm)?
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
35. 35.🧭 A robot faces east. It does: turn left, turn around, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
36. 36.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
38. 38.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 95. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True

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