Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 362 · 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 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 right on the spot (b) goes straight back (c) spins left on the spot (d) turns left
2. 2.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a bat (d) a goldfish
3. 3.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
4. 4.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) at the same speed (c) faster and weaker (d) slower but stronger
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 left on the spot (b) stays still (c) goes straight forward (d) turns right
6. 6.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a gyro sensor (c) a distance sensor (d) a touch sensor
7. 7.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 22. What is under the sensor? (a) the white floor (b) the black line
8. 8.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
9. 9.Which job needs a touch sensor? (a) start on a hand clap (b) find the brightest spot (c) feel a bump into a wall (d) measure a turn angle
10. 10.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
11. 11.🛞 Circumference = π × … (a) diameter (b) radius only (c) speed (d) weight
12. 12.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
13. 13.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius
14. 14.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a wooden box (d) a metal door
15. 15.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a gear (c) a servo (d) a caster wheel
16. 16.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
17. 17.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 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
18. 18.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black surface (d) a black line
19. 19.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) bright light (c) water drops (d) radio music
20. 20.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) wheel size (c) driver teeth (d) number of gears
21. 21.⬛ 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
22. 22.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) tyre (d) driven gear
23. 23.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
24. 24.True or false: to start on a hand clap, use a temperature sensor. (a) True (b) False
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
26. 26.🔍 Which sensor helps a robot hear a whistle? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a touch sensor
27. 27.Which of these suits wheels? (a) a flat road (b) loose sand dunes (c) flying over a field (d) hovering over a roof
28. 28.🔍 Which sensor helps a robot measure a turn angle? (a) a light sensor (b) a gyro sensor (c) a touch sensor (d) a distance sensor
29. 29.🛞 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)?
30. 30.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) one up, one down (d) the same direction
31. 31.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.🧭 A robot spins 15° every second. How many seconds does it take to turn 15°?
33. 33.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.True or false: “a muddy building site” suits tracks. (a) False (b) True
36. 36.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
37. 37.🔍 Which sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a temperature sensor
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
39. 39.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
40. 40.🔍 Why do robots need sensors? (a) to know their world (b) to use more power (c) to look colourful (d) to be heavier

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