Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 105 · 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 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
2. 2.True or false: to hear a whistle, use a camera. (a) False (b) True
3. 3.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
4. 4.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
5. 5.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black surface (d) a black line
6. 6.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) under the left sensor (c) far behind it (d) between the two sensors
7. 7.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
8. 8.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.Which of these suits wheels? (a) crossing stepping-stones (b) a flat road (c) deep mud (d) flying over a field
14. 14.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
15. 15.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
16. 16.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
18. 18.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
19. 19.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
20. 20.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
22. 22.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
23. 23.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
24. 24.🧭 A robot spins 15° every second. How many seconds does it take to turn 30°?
25. 25.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
27. 27.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
28. 28.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
29. 29.🛞 Circumference = π × … (a) speed (b) diameter (c) weight (d) radius only
30. 30.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a snail (c) a goldfish (d) a cow
31. 31.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a light sensor (c) a touch sensor (d) a camera
32. 32.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) slower but stronger (c) not at all (d) faster and weaker
33. 33.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a wooden box (d) a metal door
34. 34.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
35. 35.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
37. 37.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
38. 38.True or false: “loose sand dunes” suits tracks. (a) False (b) True
39. 39.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
40. 40.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster but weaker

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