Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 228 · 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 way of moving suits this best: “a muddy building site”? (a) legs (b) wheels (c) propellers (d) tracks
2. 2.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
3. 3.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they are round (d) they spin in the air
4. 4.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
5. 5.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) wheel size (c) driver teeth (d) number of gears
6. 6.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) goes straight back (c) turns left (d) spins left on the spot
7. 7.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
8. 8.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
9. 9.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.Which job needs a temperature sensor? (a) feel a bump into a wall (b) read a QR code (c) hear a whistle (d) warn if motors get hot
11. 11.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a gear (c) a caster wheel (d) a servo
12. 12.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 63. What is under the sensor? (a) the black line (b) the white floor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
14. 14.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) teeth (d) tyres
15. 15.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
16. 16.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 4 (c) 3 (d) 2
17. 17.🛞 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 6 times. How far does the robot roll (in cm)?
18. 18.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 90° (d) 360°
19. 19.🧭 A robot faces south. It does: turn left, turn right, turn left, turn around. Which way does it face now? (a) north (b) east (c) west (d) south
20. 20.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
21. 21.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) between the two sensors (c) far behind it (d) under the left sensor
24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
25. 25.⬛ The threshold of a light sensor is … (a) the wheel size (b) the top speed (c) the battery size (d) the black/white cut-off
26. 26.🧭 A robot should turn right 90°, but its gyro shows it turned 100°. How many degrees must it turn back to the left?
27. 27.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
28. 28.True or false: to stay balanced upright, use a touch sensor. (a) False (b) True
29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
30. 30.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 34 cm (d) 3 cm
31. 31.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a snail (c) a cow (d) a goldfish
32. 32.🧭 What does a gyro help a robot do? (a) hear claps (b) see colours (c) turn by exact angles (d) smell smoke
33. 33.🧭 A robot spins 30° every second. How many seconds does it take to turn 240°?
34. 34.🦾 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 left (b) points straight up (c) points left (d) points up and right
35. 35.⚙️ A motor makes 60 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
36. 36.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) sound too high to hear (c) radio music (d) water drops
37. 37.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) zero (d) big (slow and strong)
38. 38.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its weight (c) its radius (d) its diameter
39. 39.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 9. What is under the sensor? (a) the black line (b) the white floor
40. 40.⚙️ A 10-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed

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