Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 708 · 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 tracks? (a) a muddy building site (b) a hospital corridor (c) a long factory floor (d) a field of tall boulders
2. 2.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times bigger (c) 3 times faster (d) 3 times louder
3. 3.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) sound too high to hear (d) radio music
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
5. 5.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
6. 6.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
8. 8.⚙️ 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
9. 9.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) propellers (c) wheels (d) legs
10. 10.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
11. 11.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 37. What is under the sensor? (a) the black line (b) the white floor
12. 12.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
13. 13.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
14. 14.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
15. 15.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) fast and easy on floors (d) they climb stairs
16. 16.Which of these suits wheels? (a) crossing stepping-stones (b) moving under water (c) soft snow (d) a smooth classroom floor
17. 17.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
18. 18.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 65. What is under the sensor? (a) the white floor (b) the black line
19. 19.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
20. 20.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
22. 22.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
23. 23.📡 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)?
24. 24.🛞 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)?
25. 25.Which of these suits wheels? (a) hovering over a roof (b) soft snow (c) a flat road (d) a muddy building site
26. 26.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a dark tunnel (c) a black surface (d) a black line
27. 27.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a metal door (d) a soft foam cushion
28. 28.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
30. 30.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
31. 31.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) driver gear (d) tyre
32. 32.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
33. 33.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
34. 34.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 180° (c) 45° (d) 90°
35. 35.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
36. 36.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
38. 38.🛞 Circumference = π × … (a) diameter (b) speed (c) radius only (d) weight
39. 39.⚙️ A 36-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
40. 40.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?

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