Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 677 · 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.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
2. 2.Which job needs a touch sensor? (a) find the brightest spot (b) feel a bump into a wall (c) start on a hand clap (d) stay balanced upright
3. 3.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they never tire (d) they are too cheap
5. 5.Which of these suits wheels? (a) a field of tall boulders (b) crossing stepping-stones (c) a long factory floor (d) a muddy building site
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
7. 7.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) faster but weaker (c) not at all (d) at the same speed
8. 8.Which of these suits legs? (a) a hospital corridor (b) loose sand dunes (c) moving under water (d) a field of tall boulders
9. 9.🧭 A robot faces south. It does: turn right, turn left. Which way does it face now? (a) south (b) west (c) east (d) north
10. 10.Which job needs a camera? (a) warn if motors get hot (b) feel a bump into a wall (c) spot a red ball (d) measure a turn angle
11. 11.🧭 A robot faces north. It does: turn around, turn left, turn right. Which way does it face now? (a) north (b) west (c) east (d) south
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
13. 13.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 594 cm?
14. 14.🛞 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) turns left (c) goes straight back (d) spins left on the spot
15. 15.🦾 A servo moves from 60° to 70°. How many degrees does it turn?
16. 16.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
18. 18.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the top speed (d) the wheel size
19. 19.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 49. What is under the sensor? (a) the white floor (b) the black line
20. 20.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
21. 21.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
22. 22.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
23. 23.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) far behind it (c) between the two sensors (d) under the right sensor
24. 24.Which of these suits legs? (a) hovering over a roof (b) a flat road (c) moving under water (d) stepping over wide gaps
25. 25.Which job needs a distance sensor? (a) hear a whistle (b) know a button is pressed (c) stay balanced upright (d) stop before a wall
26. 26.⚙️ 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
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
28. 28.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 100° (d) 90°
29. 29.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 3 (d) 4
30. 30.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 3 cm (c) 340 cm (d) 34 cm
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
32. 32.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.📡 A robot is 280 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
35. 35.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) smell smoke (d) turn by exact angles
36. 36.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.🧭 A robot faces east. It does: turn left, turn right. Which way does it face now? (a) east (b) west (c) south (d) north
38. 38.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
39. 39.🔍 Which sensor helps a robot stop before a wall? (a) a temperature sensor (b) a sound sensor (c) a distance sensor (d) a gyro sensor
40. 40.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts

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