Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 938 · 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.⚙️ The gear fixed to the motor is called the … (a) tyre (b) idler gear (c) driven gear (d) driver gear
2. 2.📡 A robot is 160 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 6 seconds (in cm)?
3. 3.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a light sensor (c) a sound sensor (d) a gyro sensor
4. 4.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) legs (c) tracks (d) propellers
5. 5.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
6. 6.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
8. 8.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
9. 9.🛞 Circumference = π × … (a) radius only (b) speed (c) weight (d) diameter
10. 10.🛞 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
11. 11.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
12. 12.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) faster and weaker (d) at the same speed
13. 13.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
14. 14.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
15. 15.Which job needs a light sensor? (a) follow a black line (b) read a QR code (c) measure a turn angle (d) know a button is pressed
16. 16.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) tracks (c) propellers (d) wheels
17. 17.🔍 Which sensor helps a robot stay balanced upright? (a) a light sensor (b) a touch sensor (c) a gyro sensor (d) a camera
18. 18.🧭 A robot faces east. It does: turn left, turn around. Which way does it face now? (a) north (b) west (c) south (d) east
19. 19.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
20. 20.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
21. 21.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
22. 22.Which job needs a camera? (a) stay balanced upright (b) read a QR code (c) know a button is pressed (d) hear a whistle
23. 23.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
24. 24.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) wheel size (d) motor volts
25. 25.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
26. 26.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
28. 28.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) wheels (c) legs (d) tracks
29. 29.📡 A robot is 240 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
30. 30.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an input (c) an output (d) a gear
31. 31.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 36 times. How many times does the driven gear turn?
32. 32.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
33. 33.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
34. 34.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
36. 36.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) legs (c) propellers (d) wheels
37. 37.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 67. What is under the sensor? (a) the black line (b) the white floor
38. 38.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a snail (c) a goldfish (d) a cow
39. 39.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward

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