Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 404 · 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 around, turn left, turn left, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
2. 2.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
3. 3.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
4. 4.Which of these suits propellers? (a) loose sand dunes (b) stepping over wide gaps (c) moving under water (d) a hospital corridor
5. 5.🧭 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 left 60°, then left 30°. What does the gyro read now (0° to 359°)?
6. 6.🧭 A robot spins 15° every second. How many seconds does it take to turn 165°?
7. 7.📡 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?
8. 8.🛞 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 18 times. How far does the robot roll (in cm)?
9. 9.📡 A robot is 150 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 3 seconds (in cm)?
10. 10.Which of these suits legs? (a) moving under water (b) a flat road (c) crossing stepping-stones (d) loose sand dunes
11. 11.🛞 Circumference = π × … (a) weight (b) diameter (c) radius only (d) speed
12. 12.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 75. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
14. 14.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
15. 15.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 20
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
17. 17.🛞 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) goes straight forward (b) turns left (c) spins left on the spot (d) spins right on the spot
18. 18.Which job needs a light sensor? (a) measure a turn angle (b) read a QR code (c) find the brightest spot (d) stay balanced upright
19. 19.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster but weaker
20. 20.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
22. 22.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
24. 24.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
25. 25.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a camera (c) a distance sensor (d) a light sensor
26. 26.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
27. 27.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
28. 28.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 880 cm?
29. 29.📡 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?
30. 30.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) pins (c) teeth (d) tyres
31. 31.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
32. 32.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
33. 33.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) not at all (c) at the same speed (d) slower but stronger
34. 34.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
36. 36.📡 A robot is 100 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
37. 37.🧭 A robot faces south. It does: turn right, turn around, turn left. Which way does it face now? (a) west (b) east (c) south (d) north
38. 38.Which job needs a temperature sensor? (a) spot a red ball (b) feel a bump into a wall (c) warn if motors get hot (d) stop before a wall
39. 39.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 27. What is under the sensor? (a) the white floor (b) the black line
40. 40.True or false: to hear a whistle, use a gyro sensor. (a) False (b) True

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