Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 676 · 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 big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster but weaker
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) spins left on the spot (b) turns right (c) stays still (d) goes straight forward
3. 3.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 18. What is under the sensor? (a) the white floor (b) the black line
4. 4.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) sound too high to hear (d) water drops
5. 5.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
6. 6.🦾 A servo moves from 130° to 120°. How many degrees does it turn?
7. 7.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the battery size (c) the wheel size (d) the top speed
8. 8.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its weight (c) its diameter (d) its radius
9. 9.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
10. 10.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a snail (d) a goldfish
11. 11.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
12. 12.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
13. 13.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
14. 14.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
16. 16.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.True or false: to find the brightest spot, use a touch sensor. (a) True (b) False
19. 19.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is hot (d) black is loud
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
21. 21.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
22. 22.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
23. 23.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 154 cm?
25. 25.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 3 (c) 1 (d) 2
27. 27.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
28. 28.True or false: to feel a bump into a wall, use a sound sensor. (a) True (b) False
29. 29.Which of these suits tracks? (a) moving under water (b) a smooth classroom floor (c) crossing stepping-stones (d) soft snow
30. 30.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
31. 31.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points left (c) points up and left (d) points up and right
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 backward. What does the robot do? (a) spins left on the spot (b) turns right (c) goes straight back (d) spins right on the spot
33. 33.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
34. 34.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
35. 35.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a sound sensor (c) a gyro sensor (d) a light sensor
36. 36.Which job needs a sound sensor? (a) know a button is pressed (b) follow a black line (c) start on a hand clap (d) read a QR code
37. 37.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
38. 38.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 90° (d) 45°
39. 39.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
40. 40.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?

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