Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 382 · 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.Which of these suits legs? (a) a flat road (b) crossing stepping-stones (c) a hospital corridor (d) a muddy building site
2. 2.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
3. 3.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
4. 4.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a bat (c) a goldfish (d) a snail
5. 5.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) spokes (d) teeth
6. 6.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a soft foam cushion (d) a metal door
7. 7.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
8. 8.📡 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?
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
10. 10.🧭 A robot should turn right 45°, but its gyro shows it turned 42°. How many degrees must it turn more to the right?
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
12. 12.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
14. 14.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
15. 15.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
16. 16.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.🧭 A robot faces north. It does: turn right, turn left. Which way does it face now? (a) east (b) south (c) north (d) west
18. 18.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
19. 19.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
20. 20.🧭 A robot spins 45° every second. How many seconds does it take to turn 90°?
21. 21.🧭 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 90°. It turns left 120°, then right 30°. What does the gyro read now (0° to 359°)?
22. 22.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
23. 23.Which job needs a light sensor? (a) measure how far a box is (b) stop before a wall (c) warn if motors get hot (d) follow a black line
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
25. 25.True or false: to follow a black line, use a temperature sensor. (a) False (b) True
26. 26.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
27. 27.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 90° (c) 360° (d) 45°
28. 28.True or false: to measure how far a box is, use a distance sensor. (a) True (b) False
29. 29.Which of these suits propellers? (a) a smooth classroom floor (b) flying over a field (c) stepping over wide gaps (d) crossing stepping-stones
30. 30.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.📡 A robot is 180 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
32. 32.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
33. 33.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spin in the air (c) they spread the weight (d) they are round
35. 35.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
36. 36.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) smell smoke (d) hear claps
37. 37.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
38. 38.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
39. 39.🧭 A robot should turn right 45°, but its gyro shows it turned 60°. How many degrees must it turn back to the left?
40. 40.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?

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