Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 208 · 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 wheels? (a) soft snow (b) a hospital corridor (c) deep mud (d) a field of tall boulders
2. 2.Which job needs a temperature sensor? (a) spot a red ball (b) stay balanced upright (c) warn if motors get hot (d) hear a whistle
3. 3.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a white surface (d) a black surface
4. 4.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) nowhere (c) backwards (d) slower
5. 5.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
6. 6.🧭 A robot faces south. It does: turn around, turn left. Which way does it face now? (a) south (b) west (c) north (d) east
7. 7.Which of these suits legs? (a) a muddy building site (b) loose sand dunes (c) a smooth classroom floor (d) crossing stepping-stones
8. 8.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
9. 9.⚙️ A 15-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
10. 10.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
11. 11.Which of these suits tracks? (a) crossing stepping-stones (b) a long factory floor (c) stepping over wide gaps (d) deep mud
12. 12.📡 A robot is 100 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
13. 13.⚙️ A motor makes 90 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
15. 15.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
16. 16.True or false: “hovering over a roof” suits propellers. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) colour (d) temperature
19. 19.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times louder (d) 3 times slower
20. 20.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) wheels (c) tracks (d) legs
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
23. 23.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 41. What is under the sensor? (a) the white floor (b) the black line
26. 26.True or false: “stepping over wide gaps” suits tracks. (a) False (b) True
27. 27.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
28. 28.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius
30. 30.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
31. 31.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.🔍 Why do robots need sensors? (a) to use more power (b) to know their world (c) to be heavier (d) to look colourful
34. 34.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
35. 35.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
36. 36.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
37. 37.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) driver teeth (d) motor volts
38. 38.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.Which job needs a gyro sensor? (a) start on a hand clap (b) feel a bump into a wall (c) read a QR code (d) stay balanced upright
40. 40.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) goes straight back (b) turns right (c) spins right on the spot (d) goes straight forward

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