Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 845 · 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 servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points left (c) points straight up (d) points right
2. 2.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 340 cm (c) 1 km (d) 34 cm
3. 3.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
4. 4.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.True or false: “a hospital corridor” suits tracks. (a) True (b) False
6. 6.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) colour (c) temperature (d) sound
7. 7.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its weight (d) its radius
8. 8.⚙️ A motor makes 160 turns a minute with a 15-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
9. 9.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) sound too high to hear (d) water drops
10. 10.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
11. 11.🧭 A robot faces north. It does: turn left, turn around. Which way does it face now? (a) north (b) west (c) east (d) south
12. 12.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
13. 13.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a camera (c) a gyro sensor (d) a distance sensor
17. 17.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) at the same speed (c) slower but stronger (d) not at all
18. 18.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a gyro sensor (c) a camera (d) a sound sensor
19. 19.🔍 Why do robots need sensors? (a) to be heavier (b) to use more power (c) to look colourful (d) to know their world
20. 20.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
23. 23.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
24. 24.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) tracks (c) propellers (d) wheels
25. 25.Which of these suits wheels? (a) stepping over wide gaps (b) deep mud (c) a smooth classroom floor (d) moving under water
26. 26.Which of these suits tracks? (a) crossing stepping-stones (b) a hospital corridor (c) a muddy building site (d) flying over a field
27. 27.📡 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?
28. 28.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) slower (c) backwards (d) faster
29. 29.Which job needs a sound sensor? (a) follow a black line (b) start on a hand clap (c) spot a red ball (d) read a QR code
30. 30.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) the same direction (c) one up, one down (d) in opposite directions
31. 31.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
32. 32.Which job needs a distance sensor? (a) warn if motors get hot (b) measure how far a box is (c) know a button is pressed (d) measure a turn angle
33. 33.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
34. 34.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
35. 35.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 22 (d) 7/22
36. 36.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black surface (c) a black line (d) a dark tunnel
37. 37.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
38. 38.True or false: “deep mud” suits tracks. (a) False (b) True
39. 39.Which job needs a touch sensor? (a) measure a turn angle (b) find the brightest spot (c) know a button is pressed (d) follow a black line
40. 40.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed

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