Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 257 · 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 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)?
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a snail (d) a cow
5. 5.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points right (c) points straight up (d) points left
7. 7.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 95. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
9. 9.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
10. 10.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 90° (d) 45°
11. 11.🧭 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 left 30°. What does the gyro read now (0° to 359°)?
12. 12.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
13. 13.🔍 Why do robots need sensors? (a) to look colourful (b) to use more power (c) to be heavier (d) to know their world
14. 14.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) backwards (c) nowhere (d) faster
15. 15.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1188 cm?
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
17. 17.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a light sensor (c) a distance sensor (d) a camera
19. 19.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
20. 20.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) one wheel runs faster (d) it uses a sail
21. 21.🧭 A robot faces west. It does: turn left, turn right, turn right. Which way does it face now? (a) east (b) west (c) north (d) south
22. 22.Which job needs a light sensor? (a) measure how far a box is (b) hear a whistle (c) warn if motors get hot (d) follow a black line
23. 23.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
24. 24.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) teeth (c) spokes (d) pins
25. 25.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
26. 26.🛞 Circumference = π × … (a) speed (b) radius only (c) diameter (d) weight
27. 27.🧭 A robot spins 15° every second. How many seconds does it take to turn 240°?
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns left (b) turns right (c) goes straight back (d) spins right on the spot
29. 29.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 360° (c) 180° (d) 90°
30. 30.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a distance sensor (c) a camera (d) a gyro sensor
31. 31.⚙️ 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
32. 32.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
33. 33.Which of these suits propellers? (a) a flat road (b) hovering over a roof (c) a long factory floor (d) soft snow
34. 34.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
35. 35.True or false: to measure a turn angle, use a light sensor. (a) True (b) False
36. 36.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
37. 37.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a gear (d) a servo
38. 38.🧭 A robot should turn right 180°, but its gyro shows it turned 171°. How many degrees must it turn more to the right?
39. 39.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
40. 40.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) zero (d) big (slow and strong)

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