Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 153 · 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.🛞 Circumference = π × … (a) radius only (b) diameter (c) weight (d) speed
2. 2.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times faster (d) 3 times slower
3. 3.True or false: to find the brightest spot, use a sound sensor. (a) False (b) True
4. 4.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
5. 5.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) not at all (c) at the same speed (d) slower but stronger
6. 6.🛞 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) goes straight back (b) turns left (c) goes straight forward (d) stays still
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.🧭 A robot faces west. It does: turn around, turn right. Which way does it face now? (a) north (b) east (c) west (d) south
9. 9.Which of these suits propellers? (a) a long factory floor (b) moving under water (c) soft snow (d) a muddy building site
10. 10.True or false: “a smooth classroom floor” suits tracks. (a) False (b) True
11. 11.📡 A robot is 200 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 17 seconds (in cm)?
12. 12.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 45° (d) 180°
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 40. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
14. 14.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) sound (d) turning (rotation)
15. 15.🛞 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 2 times. How far does the robot roll (in cm)?
16. 16.⚙️ A 12-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
17. 17.🧭 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 90°. It turns right 120°, then left 180°, then left 30°. What does the gyro read now (0° to 359°)?
18. 18.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
19. 19.🔍 Which sensor helps a robot stop before a wall? (a) a camera (b) a distance sensor (c) a touch sensor (d) a light sensor
20. 20.Which job needs a distance sensor? (a) stop before a wall (b) warn if motors get hot (c) find the brightest spot (d) hear a whistle
21. 21.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 360° (d) 100°
23. 23.Which job needs a touch sensor? (a) find the brightest spot (b) warn if motors get hot (c) measure how far a box is (d) know a button is pressed
24. 24.Which job needs a gyro sensor? (a) feel a bump into a wall (b) find the brightest spot (c) follow a black line (d) measure a turn angle
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
26. 26.📡 A robot is 230 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 15 seconds (in cm)?
27. 27.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
28. 28.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
30. 30.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22/7 (c) 22 (d) 2/7
31. 31.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
32. 32.True or false: to stop before a wall, use a camera. (a) True (b) False
33. 33.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 66 cm?
34. 34.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
35. 35.Which of these suits wheels? (a) soft snow (b) flying over a field (c) a muddy building site (d) a long factory floor
36. 36.🧭 A robot should turn right 45°, but its gyro shows it turned 57°. How many degrees must it turn back to the left?
37. 37.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
38. 38.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
39. 39.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) tracks (c) propellers (d) legs
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 70. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor

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