Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 815 · 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 distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
3. 3.🔦 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) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
4. 4.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
5. 5.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is hot (d) black is loud
6. 6.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are round (c) they spread the weight (d) they are shiny
7. 7.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
8. 8.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor
9. 9.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
10. 10.True or false: “soft snow” suits tracks. (a) True (b) False
11. 11.🧭 A robot should turn right 180°, but its gyro shows it turned 192°. How many degrees must it turn back to the left?
12. 12.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) teeth (d) tyres
13. 13.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
14. 14.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its weight (c) its radius (d) its diameter
15. 15.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 3 (c) 2 (d) 4
16. 16.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
17. 17.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
18. 18.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a camera (c) a sound sensor (d) a temperature sensor
19. 19.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 15. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
22. 22.🛞 Circumference = π × … (a) weight (b) diameter (c) radius only (d) speed
23. 23.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
24. 24.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
25. 25.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
26. 26.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
27. 27.🧭 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 270°. It turns right 45°, then left 180°, then right 180°. What does the gyro read now (0° to 359°)?
28. 28.True or false: “flying over a field” suits propellers. (a) True (b) False
29. 29.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
30. 30.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
31. 31.⚙️ A 12-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
32. 32.True or false: to feel a bump into a wall, use a sound sensor. (a) True (b) False
33. 33.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 58. What is under the sensor? (a) the black line (b) the white floor
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 gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times faster (d) 3 times slower
36. 36.🔍 Which sensor helps a robot stay balanced upright? (a) a camera (b) a distance sensor (c) a gyro sensor (d) a temperature sensor
37. 37.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
38. 38.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
39. 39.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids