Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 496 · 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 motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
2. 2.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
3. 3.🧭 A robot faces north. It does: turn right, turn around, turn right, turn around. Which way does it face now? (a) north (b) west (c) east (d) south
4. 4.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
5. 5.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its circumference (c) its diameter (d) its radius
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 25. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
8. 8.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a dark tunnel (d) a white surface
9. 9.True or false: to follow a black line, use a light sensor. (a) True (b) False
10. 10.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
11. 11.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a touch sensor (c) a gyro sensor (d) a distance sensor
12. 12.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
14. 14.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
15. 15.🧭 A robot faces north. It does: turn right, turn left, turn around. Which way does it face now? (a) west (b) east (c) north (d) south
16. 16.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a bat (d) a cow
19. 19.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 30. What is under the sensor? (a) the white floor (b) the black line
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 27 times. How many times does the driven gear turn?
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 40 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 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
27. 27.📡 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)?
28. 28.📡 A robot is 120 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 3 seconds (in cm)?
29. 29.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
30. 30.True or false: to feel a bump into a wall, use a temperature sensor. (a) True (b) False
31. 31.Which of these suits legs? (a) a hospital corridor (b) moving under water (c) stepping over wide gaps (d) flying over a field
32. 32.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
33. 33.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
34. 34.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
35. 35.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) hear claps (c) see colours (d) smell smoke
36. 36.True or false: to stop before a wall, use a distance sensor. (a) True (b) False
37. 37.📡 A robot is 130 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
38. 38.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times slower (d) 3 times bigger
39. 39.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward

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