Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 500 · 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 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.Which job needs a touch sensor? (a) find the brightest spot (b) feel a bump into a wall (c) warn if motors get hot (d) measure a turn angle
3. 3.🦾 A servo program runs:
   angle = 70
   angle = angle − 20
   angle = angle + 40
   angle = angle + 60
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
4. 4.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
5. 5.⚙️ A motor makes 40 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
7. 7.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
8. 8.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) propellers (c) wheels (d) tracks
9. 9.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
10. 10.📡 A robot is 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 22 seconds (in cm)?
11. 11.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
12. 12.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
13. 13.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
14. 14.⚙️ A 15-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
15. 15.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
16. 16.Which of these suits tracks? (a) flying over a field (b) stepping over wide gaps (c) a long factory floor (d) soft snow
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 35. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
18. 18.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) not at all (d) slower but stronger
19. 19.Which of these suits wheels? (a) soft snow (b) a muddy building site (c) stepping over wide gaps (d) a smooth classroom floor
20. 20.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
21. 21.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
22. 22.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
23. 23.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
24. 24.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
26. 26.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
28. 28.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
29. 29.Which job needs a light sensor? (a) read a QR code (b) measure a turn angle (c) stop before a wall (d) follow a black line
30. 30.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.📡 Why do we halve the echo’s total path? (a) sound is slow (b) the sensor is half (c) it goes there and back (d) to make it smaller
32. 32.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
33. 33.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 13 seconds (in cm)?
34. 34.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) propellers (c) tracks (d) legs
35. 35.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points left (c) points up and right (d) points straight up
38. 38.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
39. 39.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.🔍 Which sensor helps a robot measure how far a box is? (a) a temperature sensor (b) a distance sensor (c) a camera (d) a light sensor

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