Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 276 · 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: “stepping over wide gaps” suits propellers. (a) True (b) False
2. 2.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) nowhere (c) faster (d) slower
3. 3.🔦 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
4. 4.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
5. 5.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.🛞 Circumference = π × … (a) radius only (b) diameter (c) speed (d) weight
7. 7.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
8. 8.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
10. 10.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
11. 11.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) teeth (c) pins (d) tyres
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 0°. It turns right 60°, then right 45°. What does the gyro read now (0° to 359°)?
13. 13.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
15. 15.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
16. 16.🛞 Which way of moving suits this best: “a flat road”? (a) propellers (b) tracks (c) wheels (d) legs
17. 17.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.Which job needs a sound sensor? (a) know a button is pressed (b) start on a hand clap (c) follow a black line (d) warn if motors get hot
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 10 times (in cm)?
20. 20.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
23. 23.⚙️ 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
24. 24.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🛞 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 15 times. How far does the robot roll (in cm)?
26. 26.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
27. 27.⚙️ 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
28. 28.🛞 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) turns left (b) goes straight back (c) stays still (d) spins left on the spot
29. 29.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) motor volts (d) number of gears
30. 30.⚙️ A motor makes 50 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
31. 31.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 95. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
33. 33.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.Which job needs a sound sensor? (a) measure how far a box is (b) warn if motors get hot (c) follow a black line (d) hear a whistle
37. 37.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
38. 38.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) tracks (c) wheels (d) propellers
39. 39.🔍 Which sensor helps a robot stay balanced upright? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a touch sensor
40. 40.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a caster wheel (d) a track

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