Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 568 · 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.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
2. 2.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a white surface (d) a black line
3. 3.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
4. 4.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
5. 5.🛞 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) spins right on the spot (b) spins left on the spot (c) stays still (d) goes straight forward
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
7. 7.📡 A robot is 260 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 37 seconds (in cm)?
8. 8.⚙️ A 20-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
10. 10.📡 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 4 seconds (in cm)?
11. 11.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
12. 12.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
13. 13.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they are shiny (d) they spin in the air
14. 14.Which job needs a sound sensor? (a) follow a black line (b) hear a whistle (c) read a QR code (d) measure a turn angle
15. 15.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) propellers (c) tracks (d) wheels
16. 16.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) bright light (c) radio music (d) water drops
17. 17.Which of these suits tracks? (a) a hospital corridor (b) loose sand dunes (c) moving under water (d) a smooth classroom floor
18. 18.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
19. 19.True or false: to feel a bump into a wall, use a temperature sensor. (a) False (b) True
20. 20.Which of these suits propellers? (a) crossing stepping-stones (b) a long factory floor (c) hovering over a roof (d) a field of tall boulders
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
22. 22.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it uses a sail (c) one wheel runs faster (d) it jumps
23. 23.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🧭 A robot faces west. It does: turn right, turn right, turn left, turn left. Which way does it face now? (a) east (b) north (c) west (d) south
25. 25.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
26. 26.🦾 A servo moves from 120° to 80°. How many degrees does it turn?
27. 27.📡 A robot is 160 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 1 second (in cm)?
28. 28.⚙️ A 24-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
29. 29.🛞 Circumference = π × … (a) radius only (b) weight (c) speed (d) diameter
30. 30.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 24. What is under the sensor? (a) the white floor (b) the black line
31. 31.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
32. 32.🛞 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 forward. What does the robot do? (a) spins left on the spot (b) goes straight forward (c) turns left (d) turns right
33. 33.🧭 A robot faces south. It does: turn right, turn right. Which way does it face now? (a) west (b) north (c) south (d) east
34. 34.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 27. What is under the sensor? (a) the white floor (b) the black line
35. 35.Which job needs a light sensor? (a) measure how far a box is (b) start on a hand clap (c) know a button is pressed (d) follow a black line
36. 36.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
37. 37.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
38. 38.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
39. 39.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 360° (d) 90°
40. 40.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?

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