Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 56 · 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 of these suits legs? (a) soft snow (b) loose sand dunes (c) stepping over wide gaps (d) a hospital corridor
2. 2.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
3. 3.True or false: “a flat road” suits tracks. (a) True (b) False
4. 4.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
6. 6.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
8. 8.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
9. 9.🛞 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
10. 10.🦾 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 left (b) points up and right (c) points left (d) points right
11. 11.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
12. 12.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
13. 13.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) water drops (d) sound too high to hear
14. 14.📡 A robot is 290 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 9 seconds (in cm)?
15. 15.True or false: “a hospital corridor” suits wheels. (a) True (b) False
16. 16.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a sound sensor (c) a touch sensor (d) a light sensor
17. 17.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
18. 18.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 29 seconds (in cm)?
19. 19.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight forward (b) goes straight back (c) stays still (d) turns left
20. 20.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 90° (d) 360°
21. 21.Which job needs a light sensor? (a) warn if motors get hot (b) measure how far a box is (c) spot a red ball (d) find the brightest spot
22. 22.🧭 A robot faces north. It does: turn left, turn around, turn around, turn right. Which way does it face now? (a) south (b) north (c) east (d) west
23. 23.True or false: to measure a turn angle, use a gyro sensor. (a) False (b) True
24. 24.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
25. 25.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
26. 26.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
27. 27.⚙️ A 12-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
28. 28.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a goldfish (d) a bat
29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
30. 30.📡 A robot is 230 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 6 seconds (in cm)?
31. 31.🔢 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)
32. 32.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
33. 33.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
34. 34.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a gyro sensor (c) a distance sensor (d) a sound sensor
38. 38.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is hot (d) black is loud
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big

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