Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 148 · 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 motor makes 40 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
2. 2.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) spokes (c) pins (d) tyres
4. 4.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
5. 5.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) nowhere (c) slower (d) faster
6. 6.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
7. 7.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a touch sensor (c) a sound sensor (d) a camera
8. 8.📡 A robot is 180 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 4 seconds (in cm)?
9. 9.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) faster but weaker (c) at the same speed (d) not at all
12. 12.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
13. 13.Which job needs a gyro sensor? (a) read a QR code (b) start on a hand clap (c) find the brightest spot (d) measure a turn angle
14. 14.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 180° (d) 90°
15. 15.Which of these suits tracks? (a) a hospital corridor (b) flying over a field (c) loose sand dunes (d) a smooth classroom floor
16. 16.🦾 A servo moves from 130° to 80°. How many degrees does it turn?
17. 17.True or false: to know a button is pressed, use a temperature sensor. (a) False (b) True
18. 18.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
19. 19.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) see colours (c) hear claps (d) smell smoke
20. 20.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a temperature sensor (c) a sound sensor (d) a distance sensor
21. 21.⚙️ A motor makes 20 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
22. 22.🧭 A robot faces west. It does: turn right, turn right, turn right, turn left. Which way does it face now? (a) east (b) south (c) north (d) west
23. 23.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
24. 24.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a gyro sensor (d) a sound sensor
25. 25.🧭 A robot spins 45° every second. How many seconds does it take to turn 270°?
26. 26.⚙️ A motor makes 330 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?
27. 27.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
28. 28.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 49. What is under the sensor? (a) the black line (b) the white floor
29. 29.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
30. 30.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) faster and weaker (d) at the same speed
31. 31.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a wooden box (d) a metal door
32. 32.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
33. 33.🧭 A robot spins 30° every second. How many seconds does it take to turn 300°?
34. 34.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 1 second (in cm)?
35. 35.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
36. 36.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) under the right sensor (d) far behind it
37. 37.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
38. 38.True or false: “moving under water” suits propellers. (a) True (b) False
39. 39.Which of these suits propellers? (a) deep mud (b) a flat road (c) flying over a field (d) a field of tall boulders
40. 40.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True

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