Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 735 · 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 stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
2. 2.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
3. 3.📡 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)?
4. 4.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) turn by exact angles (d) see colours
5. 5.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
6. 6.Which of these suits propellers? (a) flying over a field (b) a field of tall boulders (c) deep mud (d) a flat road
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
8. 8.True or false: to measure a turn angle, use a camera. (a) False (b) True
9. 9.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
10. 10.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
11. 11.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) in opposite directions (c) they do not turn (d) the same direction
12. 12.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
14. 14.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
15. 15.True or false: to stop before a wall, use a camera. (a) True (b) False
16. 16.🛞 Why do most indoor robots use wheels? (a) they float (b) they look funny (c) fast and easy on floors (d) they climb stairs
17. 17.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
18. 18.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
21. 21.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
22. 22.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a bat (d) a cow
23. 23.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.🔍 Which sensor helps a robot measure how far a box is? (a) a temperature sensor (b) a sound sensor (c) a touch sensor (d) a distance sensor
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a sound sensor (d) a gyro sensor
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
29. 29.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.⚙️ A motor makes 480 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?
31. 31.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) goes straight back (b) turns right (c) goes straight forward (d) stays still
32. 32.🔍 Which sensor helps a robot measure a turn angle? (a) a light sensor (b) a temperature sensor (c) a touch sensor (d) a gyro sensor
33. 33.🧭 A robot spins 15° every second. How many seconds does it take to turn 105°?
34. 34.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
35. 35.Which job needs a gyro sensor? (a) find the brightest spot (b) read a QR code (c) measure a turn angle (d) know a button is pressed
36. 36.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
37. 37.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 21. What is under the sensor? (a) the black line (b) the white floor
38. 38.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a wooden box (c) a metal door (d) a flat wall
39. 39.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
40. 40.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 47. What is under the sensor? (a) the white floor (b) the black line

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