Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 818 · 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 fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
2. 2.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a metal door (d) a wooden box
3. 3.🦾 A servo program runs:
   angle = 170
   angle = angle − 20
   angle = angle − 60
   angle = angle − 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
4. 4.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.📡 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?
6. 6.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) they never tire (d) harder to balance
7. 7.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.🛞 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 forward. What does the robot do? (a) goes straight forward (b) spins left on the spot (c) spins right on the spot (d) stays still
9. 9.🔍 Which sensor helps a robot spot a red ball? (a) a gyro sensor (b) a light sensor (c) a temperature sensor (d) a camera
10. 10.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
11. 11.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a bat (d) a cow
12. 12.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
13. 13.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
15. 15.Which of these suits propellers? (a) moving under water (b) a long factory floor (c) crossing stepping-stones (d) a muddy building site
16. 16.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) the same direction (d) in opposite directions
17. 17.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) tyres (c) pins (d) teeth
18. 18.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
19. 19.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
20. 20.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
21. 21.🧭 A robot should turn right 90°, but its gyro shows it turned 81°. How many degrees must it turn more to the right?
22. 22.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
23. 23.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
24. 24.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it jumps (c) it stops for ever (d) one wheel runs faster
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.🧭 A robot faces west. It does: turn around, turn right, turn right, turn left. Which way does it face now? (a) north (b) south (c) west (d) east
27. 27.True or false: “hovering over a roof” suits tracks. (a) True (b) False
28. 28.🧭 A robot faces north. It does: turn around, turn left. Which way does it face now? (a) east (b) south (c) north (d) west
29. 29.⚙️ A 30-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
30. 30.Which job needs a distance sensor? (a) stop before a wall (b) stay balanced upright (c) feel a bump into a wall (d) hear a whistle
31. 31.True or false: “a field of tall boulders” suits legs. (a) True (b) False
32. 32.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
34. 34.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) sound is slow (c) it goes there and back (d) the sensor is half
35. 35.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
36. 36.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
37. 37.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
38. 38.True or false: to hear a whistle, use a gyro sensor. (a) True (b) False
39. 39.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
40. 40.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?

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