Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 825 · 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 small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a track (d) a caster wheel
2. 2.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
4. 4.⬛ The threshold of a light sensor is … (a) the battery size (b) the wheel size (c) the black/white cut-off (d) the top speed
5. 5.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
6. 6.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) legs (c) tracks (d) wheels
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
8. 8.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 44. What is under the sensor? (a) the black line (b) the white floor
9. 9.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 22 (c) 2/7 (d) 7/22
10. 10.Which job needs a light sensor? (a) follow a black line (b) stay balanced upright (c) know a button is pressed (d) spot a red ball
11. 11.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
12. 12.🧭 A robot spins 15° every second. How many seconds does it take to turn 210°?
13. 13.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 52. What is under the sensor? (a) the white floor (b) the black line
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
15. 15.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
16. 16.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.📡 A robot is 150 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 20 seconds (in cm)?
18. 18.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) under the left sensor (c) far behind it (d) between the two sensors
19. 19.Which of these suits legs? (a) soft snow (b) a flat road (c) moving under water (d) crossing stepping-stones
20. 20.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) pins (d) teeth
21. 21.🧭 A robot should turn right 90°, but its gyro shows it turned 87°. How many degrees must it turn more to the right?
22. 22.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
23. 23.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
24. 24.Which job needs a gyro sensor? (a) measure a turn angle (b) feel a bump into a wall (c) find the brightest spot (d) know a button is pressed
25. 25.🧭 How many degrees is a right-angle turn? (a) 45° (b) 360° (c) 90° (d) 180°
26. 26.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
27. 27.🔍 Why do robots need sensors? (a) to use more power (b) to be heavier (c) to know their world (d) to look colourful
28. 28.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) it goes there and back (d) to make it smaller
29. 29.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
30. 30.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
31. 31.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
32. 32.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
33. 33.🛞 Which way of moving suits this best: “moving under water”? (a) propellers (b) legs (c) wheels (d) tracks
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
36. 36.Which job needs a touch sensor? (a) follow a black line (b) warn if motors get hot (c) know a button is pressed (d) spot a red ball
37. 37.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
39. 39.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a temperature sensor (c) a touch sensor (d) a camera
40. 40.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and right (b) points straight up (c) points up and left (d) points right

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