Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 955 · 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.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its radius (c) its diameter (d) its weight
2. 2.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
3. 3.⬛ The threshold of a light sensor is … (a) the top speed (b) the black/white cut-off (c) the battery size (d) the wheel size
4. 4.🛞 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 backward. What does the robot do? (a) stays still (b) spins right on the spot (c) goes straight back (d) spins left on the spot
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
6. 6.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
7. 7.Which of these suits propellers? (a) flying over a field (b) a muddy building site (c) crossing stepping-stones (d) a flat road
8. 8.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
9. 9.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
10. 10.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
11. 11.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a metal door (d) a soft foam cushion
12. 12.🦾 A servo moves from 40° to 90°. How many degrees does it turn?
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns left (b) spins left on the spot (c) stays still (d) turns right
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
15. 15.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a white surface (d) a black surface
16. 16.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 3 cm (d) 34 cm
17. 17.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.🔍 Which sensor helps a robot find the brightest spot? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a light sensor
19. 19.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
20. 20.Which of these suits legs? (a) stepping over wide gaps (b) deep mud (c) a smooth classroom floor (d) a long factory floor
21. 21.📡 A robot is 140 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 3 seconds (in cm)?
22. 22.🔍 Which sensor helps a robot stay balanced upright? (a) a distance sensor (b) a gyro sensor (c) a sound sensor (d) a touch sensor
23. 23.🛞 Which way of moving suits this best: “a flat road”? (a) tracks (b) legs (c) wheels (d) propellers
24. 24.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) in opposite directions (c) the same direction (d) they do not turn
25. 25.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
26. 26.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
27. 27.True or false: “a flat road” suits propellers. (a) True (b) False
28. 28.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
29. 29.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
30. 30.🧭 A robot faces east. It does: turn around, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
31. 31.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
32. 32.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
33. 33.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) propellers (c) tracks (d) legs
34. 34.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
35. 35.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a gyro sensor
36. 36.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
37. 37.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
38. 38.📡 A robot is 150 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
39. 39.True or false: to measure a turn angle, use a camera. (a) True (b) False
40. 40.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True

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