Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 531 · 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.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are round (c) they are shiny (d) they spin in the air
2. 2.⚙️ A 10-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
3. 3.🛞 Which way of moving suits this best: “moving under water”? (a) propellers (b) legs (c) tracks (d) wheels
4. 4.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
5. 5.🛞 Circumference = π × … (a) speed (b) radius only (c) diameter (d) weight
6. 6.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22 (c) 22/7 (d) 7/22
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.⚙️ A 20-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
9. 9.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
10. 10.Which job needs a sound sensor? (a) measure a turn angle (b) hear a whistle (c) stop before a wall (d) follow a black line
11. 11.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
12. 12.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
14. 14.📡 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?
15. 15.📡 A robot is 210 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 7 seconds (in cm)?
16. 16.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) turn by exact angles (d) smell smoke
17. 17.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
18. 18.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) goes straight back (b) turns right (c) stays still (d) spins right on the spot
19. 19.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
20. 20.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
22. 22.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
23. 23.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 78. What is under the sensor? (a) the white floor (b) the black line
24. 24.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 70. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
27. 27.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
28. 28.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
29. 29.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a light sensor (c) a distance sensor (d) a touch sensor
30. 30.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
31. 31.🔍 Which sensor helps a robot hear a whistle? (a) a light sensor (b) a sound sensor (c) a camera (d) a touch sensor
32. 32.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
33. 33.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
34. 34.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) bright light (d) water drops
35. 35.🔍 Which sensor helps a robot read a QR code? (a) a light sensor (b) a camera (c) a distance sensor (d) a gyro sensor
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
37. 37.Which job needs a touch sensor? (a) start on a hand clap (b) stop before a wall (c) follow a black line (d) know a button is pressed
38. 38.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
39. 39.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 45° (d) 90°
40. 40.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) the sky (d) water

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