Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 377 · 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 servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points right (b) points up and left (c) points left (d) points up and right
2. 2.Which of these suits propellers? (a) crossing stepping-stones (b) deep mud (c) a long factory floor (d) hovering over a roof
3. 3.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) tyre (c) driven gear (d) driver gear
4. 4.Which job needs a temperature sensor? (a) feel a bump into a wall (b) warn if motors get hot (c) measure how far a box is (d) spot a red ball
5. 5.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
6. 6.🧭 A robot spins 15° every second. How many seconds does it take to turn 195°?
7. 7.Which job needs a light sensor? (a) follow a black line (b) spot a red ball (c) hear a whistle (d) feel a bump into a wall
8. 8.🔍 Which sensor helps a robot find the brightest spot? (a) a distance sensor (b) a sound sensor (c) a touch sensor (d) a light sensor
9. 9.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) spokes (d) teeth
10. 10.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 45° (d) 180°
11. 11.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
12. 12.True or false: to stay balanced upright, use a gyro sensor. (a) True (b) False
13. 13.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.🧭 A robot faces south. It does: turn left, turn left, turn left, turn left. Which way does it face now? (a) south (b) north (c) west (d) east
15. 15.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driver turns 32 times. How many times does the driven gear turn?
16. 16.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
17. 17.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) colour (c) sound (d) temperature
18. 18.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) slower but stronger (c) not at all (d) at the same speed
19. 19.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) one wheel runs faster (d) it uses a sail
20. 20.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
22. 22.🧭 A robot should turn right 45°, but its gyro shows it turned 31°. How many degrees must it turn more to the right?
23. 23.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is wet (d) black is hot
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 20. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
26. 26.📡 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)?
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 34. What is under the sensor? (a) the white floor (b) the black line
28. 28.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
29. 29.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 880 cm?
30. 30.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) sound is slow (c) the sensor is half (d) to make it smaller
31. 31.🔍 Why do robots need sensors? (a) to be heavier (b) to use more power (c) to know their world (d) to look colourful
32. 32.True or false: to read a QR code, use a camera. (a) True (b) False
33. 33.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
34. 34.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
36. 36.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
37. 37.Which job needs a distance sensor? (a) follow a black line (b) find the brightest spot (c) read a QR code (d) measure how far a box is
38. 38.🦾 A servo moves from 120° to 180°. How many degrees does it turn?
39. 39.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its radius (c) its weight (d) its diameter
40. 40.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?

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