Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 595 · 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 light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
2. 2.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times bigger (d) 3 times faster
3. 3.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) propellers (c) wheels (d) legs
4. 4.🔍 Which sensor helps a robot start on a hand clap? (a) a gyro sensor (b) a sound sensor (c) a camera (d) a distance sensor
5. 5.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a touch sensor
6. 6.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns right (b) stays still (c) turns left (d) spins left on the spot
7. 7.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
8. 8.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
9. 9.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) water drops (d) sound too high to hear
10. 10.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) wheels (c) propellers (d) tracks
11. 11.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
12. 12.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 34 cm (d) 3 cm
13. 13.📡 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)?
14. 14.🛞 Which way of moving suits this best: “soft snow”? (a) legs (b) propellers (c) tracks (d) wheels
15. 15.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
17. 17.🛞 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
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
19. 19.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its diameter (c) its circumference (d) its weight
20. 20.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is hot (c) black is loud (d) black is wet
21. 21.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) tracks (c) wheels (d) legs
22. 22.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) wheels (c) legs (d) propellers
23. 23.True or false: to stop before a wall, use a temperature sensor. (a) False (b) True
24. 24.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) propellers (c) wheels (d) legs
25. 25.📡 A robot is 250 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)?
26. 26.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
27. 27.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
28. 28.📡 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)?
29. 29.Which of these suits legs? (a) stepping over wide gaps (b) loose sand dunes (c) a smooth classroom floor (d) a flat road
30. 30.🧭 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 180°. It turns right 90°, then left 30°, then left 30°. What does the gyro read now (0° to 359°)?
31. 31.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
32. 32.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
33. 33.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
34. 34.🔍 Why do robots need sensors? (a) to look colourful (b) to know their world (c) to use more power (d) to be heavier
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
36. 36.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) slower but stronger (d) at the same speed
38. 38.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
39. 39.⚙️ 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
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right

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