Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 665 · 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 job needs a touch sensor? (a) feel a bump into a wall (b) stop before a wall (c) spot a red ball (d) start on a hand clap
2. 2.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
3. 3.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
4. 4.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
5. 5.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) goes straight forward (c) spins right on the spot (d) goes straight back
6. 6.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
7. 7.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 13. What is under the sensor? (a) the white floor (b) the black line
8. 8.🧭 A robot spins 30° every second. How many seconds does it take to turn 300°?
9. 9.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) tracks (c) wheels (d) propellers
10. 10.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
11. 11.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) the sensor is half (c) to make it smaller (d) sound is slow
12. 12.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.True or false: to warn if motors get hot, use a temperature sensor. (a) False (b) True
14. 14.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its circumference (d) its diameter
15. 15.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
16. 16.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.Which job needs a gyro sensor? (a) find the brightest spot (b) feel a bump into a wall (c) measure a turn angle (d) hear a whistle
18. 18.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
20. 20.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
21. 21.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times slower (d) 3 times louder
22. 22.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a touch sensor
23. 23.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 35. What is under the sensor? (a) the white floor (b) the black line
24. 24.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
26. 26.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) turns left (b) stays still (c) goes straight forward (d) goes straight back
28. 28.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) smell smoke (c) hear claps (d) see colours
29. 29.📡 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) Yes (b) No
30. 30.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) tyre (c) idler gear (d) driver gear
31. 31.Which job needs a touch sensor? (a) find the brightest spot (b) stop before a wall (c) start on a hand clap (d) know a button is pressed
32. 32.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
33. 33.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
35. 35.True or false: “hovering over a roof” suits legs. (a) True (b) False
36. 36.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) propellers (c) wheels (d) tracks
37. 37.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
38. 38.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) driver teeth (d) number of gears
39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle − 40
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🛞 Circumference = π × … (a) diameter (b) speed (c) radius only (d) weight

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