Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 755 · 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.True or false: to feel a bump into a wall, use a temperature sensor. (a) True (b) False
2. 2.🧭 What does a gyro help a robot do? (a) smell smoke (b) hear claps (c) see colours (d) turn by exact angles
3. 3.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
4. 4.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) legs (b) propellers (c) wheels (d) tracks
5. 5.⚙️ A 30-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
6. 6.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) tyres (c) teeth (d) pins
7. 7.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
8. 8.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) sound is slow (c) the sensor is half (d) it goes there and back
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
11. 11.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
12. 12.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 340 cm (d) 3 cm
13. 13.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a sound sensor (c) a touch sensor (d) a distance sensor
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 75. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
15. 15.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
16. 16.🛞 Circumference = π × … (a) weight (b) radius only (c) diameter (d) speed
17. 17.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they climb stairs (d) they look funny
18. 18.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 20
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.📡 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?
20. 20.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) a wheel (c) an input (d) an output
21. 21.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
23. 23.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
24. 24.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
26. 26.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
27. 27.True or false: to warn if motors get hot, use a camera. (a) False (b) True
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight back (b) spins left on the spot (c) turns left (d) stays still
29. 29.🔍 Which sensor helps a robot find the brightest spot? (a) a gyro sensor (b) a temperature sensor (c) a light sensor (d) a touch sensor
30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 50
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
32. 32.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
33. 33.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
34. 34.🧭 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 0°. It turns left 30°, then right 60°, then left 180°. What does the gyro read now (0° to 359°)?
35. 35.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) big (slow and strong) (d) zero
36. 36.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 180° (d) 90°
38. 38.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) between the two sensors (d) under the left sensor
39. 39.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 64. What is under the sensor? (a) the black line (b) the white floor
40. 40.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 5. What is under the sensor? (a) the white floor (b) the black line

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