Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 995 · 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.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
2. 2.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
3. 3.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the black/white cut-off (d) the top speed
4. 4.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 34 cm (d) 3 cm
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 25. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
6. 6.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight back (b) spins right on the spot (c) stays still (d) goes straight forward
7. 7.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
9. 9.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a light sensor (c) a distance sensor (d) a sound sensor
10. 10.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a touch sensor (c) a camera (d) a sound sensor
11. 11.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
12. 12.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 180°. It turns left 120°, then left 60°, then left 180°. What does the gyro read now (0° to 359°)?
13. 13.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
14. 14.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
15. 15.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
17. 17.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
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 15 seconds (in cm)?
19. 19.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
20. 20.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
21. 21.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
22. 22.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it stops for ever (c) it uses a sail (d) it jumps
23. 23.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
24. 24.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
25. 25.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
26. 26.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
27. 27.🧭 A robot faces east. It does: turn right, turn around, turn right, turn right. Which way does it face now? (a) south (b) east (c) north (d) west
28. 28.Which job needs a temperature sensor? (a) follow a black line (b) measure how far a box is (c) warn if motors get hot (d) start on a hand clap
29. 29.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.🧭 A robot faces south. It does: turn right, turn around. Which way does it face now? (a) west (b) north (c) east (d) south
31. 31.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a bat (c) a snail (d) a goldfish
32. 32.🧭 How many degrees is a right-angle turn? (a) 45° (b) 360° (c) 90° (d) 180°
33. 33.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
34. 34.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) radio music (d) sound too high to hear
35. 35.🧭 A robot faces west. It does: turn right, turn right. Which way does it face now? (a) east (b) south (c) west (d) north
36. 36.True or false: “flying over a field” suits tracks. (a) True (b) False
37. 37.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 22/7 (d) 2/7
38. 38.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 1 (c) 3 (d) 4
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?

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