Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 692 · 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.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
2. 2.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
3. 3.📡 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)?
4. 4.Which job needs a camera? (a) stop before a wall (b) know a button is pressed (c) hear a whistle (d) spot a red ball
5. 5.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it stops for ever (d) it uses a sail
6. 6.Which job needs a gyro sensor? (a) measure a turn angle (b) start on a hand clap (c) hear a whistle (d) spot a red ball
7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
8. 8.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.⚙️ An 8-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
12. 12.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 70. What is under the sensor? (a) the black line (b) the white floor
13. 13.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 77. What is under the sensor? (a) the black line (b) the white floor
14. 14.🔍 Which sensor helps a robot read a QR code? (a) a sound sensor (b) a gyro sensor (c) a camera (d) a distance sensor
15. 15.True or false: “crossing stepping-stones” suits legs. (a) True (b) False
16. 16.📡 A robot is 190 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 19 seconds (in cm)?
17. 17.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 59. What is under the sensor? (a) the black line (b) the white floor
18. 18.📡 A robot is 150 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 17 seconds (in cm)?
19. 19.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1188 cm?
20. 20.Which job needs a sound sensor? (a) stop before a wall (b) find the brightest spot (c) start on a hand clap (d) feel a bump into a wall
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
22. 22.🧭 A robot faces south. It does: turn right, turn left, turn left. Which way does it face now? (a) east (b) west (c) south (d) north
23. 23.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
24. 24.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
25. 25.⚙️ 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
26. 26.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
27. 27.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) a gear (d) an input
29. 29.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
30. 30.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
31. 31.True or false: to hear a whistle, use a touch sensor. (a) False (b) True
32. 32.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 360° (d) 180°
33. 33.📡 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?
34. 34.🛞 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) goes straight forward (c) turns right (d) spins left on the spot
35. 35.📡 A robot is 180 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)?
36. 36.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its radius (d) its circumference
37. 37.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
38. 38.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
39. 39.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
40. 40.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to use more power (d) to know their world

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