Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 562 · 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.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it stops for ever (c) it jumps (d) it uses a sail
2. 2.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 3 seconds (in cm)?
3. 3.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
4. 4.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 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
6. 6.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
7. 7.🧭 A robot should turn right 90°, but its gyro shows it turned 76°. How many degrees must it turn more to the right?
8. 8.True or false: “moving under water” suits legs. (a) True (b) False
9. 9.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 26. What is under the sensor? (a) the black line (b) the white floor
10. 10.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
11. 11.📡 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?
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
13. 13.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 180° (d) 45°
14. 14.⚙️ 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
15. 15.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
16. 16.🛞 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 forward. What does the robot do? (a) stays still (b) goes straight forward (c) goes straight back (d) turns right
17. 17.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 10 seconds (in cm)?
19. 19.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a white surface (c) a black surface (d) a dark tunnel
20. 20.🧭 A robot faces east. It does: turn around, turn right, turn left, turn right. Which way does it face now? (a) north (b) west (c) east (d) south
21. 21.🧭 A robot faces east. It does: turn left, turn around. Which way does it face now? (a) south (b) east (c) north (d) west
22. 22.Which job needs a gyro sensor? (a) spot a red ball (b) stay balanced upright (c) know a button is pressed (d) warn if motors get hot
23. 23.True or false: to stop before a wall, use a sound sensor. (a) True (b) False
24. 24.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) legs (c) wheels (d) tracks
25. 25.⚙️ 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
26. 26.True or false: “loose sand dunes” suits legs. (a) True (b) False
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 13. What is under the sensor? (a) the black line (b) the white floor
28. 28.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its circumference (d) its diameter
29. 29.⚙️ A 30-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
32. 32.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
33. 33.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to know their world (d) to be heavier
34. 34.🧭 A robot faces west. It does: turn right, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “crossing stepping-stones” suits propellers. (a) False (b) True
37. 37.True or false: “crossing stepping-stones” suits legs. (a) False (b) True
38. 38.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
39. 39.⬛ The threshold of a light sensor is … (a) the wheel size (b) the black/white cut-off (c) the top speed (d) the battery size
40. 40.🧭 How many degrees is a right-angle turn? (a) 45° (b) 360° (c) 90° (d) 180°

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