Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 539 · 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 has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 10. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
2. 2.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a touch sensor (c) a sound sensor (d) a gyro sensor
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 75. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
4. 4.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
5. 5.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) water drops (c) bright light (d) sound too high to hear
6. 6.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
7. 7.True or false: “a hospital corridor” suits wheels. (a) True (b) False
8. 8.Which of these suits wheels? (a) moving under water (b) a flat road (c) loose sand dunes (d) stepping over wide gaps
9. 9.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
10. 10.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
11. 11.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
13. 13.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) backwards (d) nowhere
14. 14.🔍 What does a gyro sensor measure? (a) sound (b) temperature (c) colour (d) turning (rotation)
15. 15.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
16. 16.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spread the weight (d) they spin in the air
17. 17.🧭 A robot should turn right 180°, but its gyro shows it turned 167°. How many degrees must it turn more to the right?
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 85. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
19. 19.⚙️ A motor makes 440 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
20. 20.🧭 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 right 90°, then left 180°. What does the gyro read now (0° to 359°)?
21. 21.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they float (c) they climb stairs (d) they look funny
22. 22.🧭 What does a gyro help a robot do? (a) smell smoke (b) hear claps (c) turn by exact angles (d) see colours
23. 23.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) an input (d) a wheel
24. 24.Which of these suits propellers? (a) stepping over wide gaps (b) hovering over a roof (c) a smooth classroom floor (d) loose sand dunes
25. 25.Which job needs a gyro sensor? (a) read a QR code (b) measure how far a box is (c) find the brightest spot (d) stay balanced upright
26. 26.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero
27. 27.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a white surface (c) a black surface (d) a dark tunnel
28. 28.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times bigger (d) 3 times louder
29. 29.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
30. 30.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
32. 32.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
33. 33.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
34. 34.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 180° (d) 45°
35. 35.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its weight (c) its diameter (d) its radius
36. 36.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it stops for ever (d) it uses a sail
37. 37.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 3 cm (d) 340 cm
38. 38.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?

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