Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 200 · 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 propellers? (a) moving under water (b) a field of tall boulders (c) a muddy building site (d) stepping over wide gaps
2. 2.Which job needs a sound sensor? (a) read a QR code (b) feel a bump into a wall (c) stay balanced upright (d) start on a hand clap
3. 3.⚙️ A 36-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) slower (c) faster
4. 4.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) the sensor is half (d) sound is slow
5. 5.True or false: to follow a black line, use a light sensor. (a) False (b) True
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
7. 7.Which of these suits wheels? (a) a muddy building site (b) flying over a field (c) a hospital corridor (d) stepping over wide gaps
8. 8.True or false: “moving under water” suits propellers. (a) True (b) False
9. 9.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
10. 10.🛞 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 forward. What does the robot do? (a) goes straight back (b) stays still (c) goes straight forward (d) turns left
11. 11.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) teeth (c) pins (d) spokes
12. 12.True or false: to warn if motors get hot, use a touch sensor. (a) False (b) True
13. 13.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
14. 14.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
15. 15.⚙️ A motor makes 20 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
16. 16.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) not at all (c) at the same speed (d) slower but stronger
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
18. 18.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
19. 19.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
20. 20.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a white surface (c) a dark tunnel (d) a black line
21. 21.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a touch sensor (c) a gyro sensor (d) a camera
22. 22.True or false: to follow a black line, use a temperature sensor. (a) True (b) False
23. 23.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.🔍 Which sensor helps a robot read a QR code? (a) a sound sensor (b) a touch sensor (c) a camera (d) a gyro sensor
25. 25.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 40. What is under the sensor? (a) the white floor (b) the black line
28. 28.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
31. 31.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
32. 32.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
33. 33.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 30. What is under the sensor? (a) the white floor (b) the black line
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
35. 35.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a metal door (d) a soft foam cushion
36. 36.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a gyro sensor (c) a light sensor (d) a sound sensor
37. 37.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.🧭 A robot faces east. It does: turn left, turn around, turn left, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
39. 39.📡 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?
40. 40.Which of these suits legs? (a) soft snow (b) flying over a field (c) stepping over wide gaps (d) deep mud

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