Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 743 · 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 stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
2. 2.⚙️ An 8-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
3. 3.🔍 Which sensor helps a robot hear a whistle? (a) a gyro sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
4. 4.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
5. 5.⚙️ A motor makes 40 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
6. 6.Which job needs a temperature sensor? (a) measure a turn angle (b) start on a hand clap (c) find the brightest spot (d) warn if motors get hot
7. 7.🛞 Circumference = π × … (a) diameter (b) weight (c) speed (d) radius only
8. 8.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 360° (d) 180°
9. 9.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) in opposite directions (c) the same direction (d) one up, one down
10. 10.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 80. What is under the sensor? (a) the black line (b) the white floor
11. 11.⚙️ A 12-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
12. 12.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points straight up (c) points up and left (d) points up and right
13. 13.True or false: “flying over a field” suits propellers. (a) False (b) True
14. 14.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
15. 15.🧭 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 180°, then left 120°. What does the gyro read now (0° to 359°)?
16. 16.🔍 Which sensor helps a robot spot a red ball? (a) a camera (b) a distance sensor (c) a gyro sensor (d) a temperature sensor
17. 17.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
19. 19.🧭 A robot should turn right 180°, but its gyro shows it turned 166°. How many degrees must it turn more to the right?
20. 20.Which of these suits tracks? (a) a flat road (b) deep mud (c) hovering over a roof (d) a hospital corridor
21. 21.⚙️ 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 big driver gear (b) a small driver gear
22. 22.📡 A robot is 170 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
23. 23.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) tracks (c) propellers (d) legs
24. 24.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
26. 26.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight forward (b) goes straight back (c) turns left (d) spins left on the spot
27. 27.Which job needs a touch sensor? (a) measure how far a box is (b) feel a bump into a wall (c) spot a red ball (d) read a QR code
28. 28.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
29. 29.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
30. 30.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.🛞 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) stays still (b) spins left on the spot (c) goes straight forward (d) turns right
32. 32.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times louder (d) 3 times faster
33. 33.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its weight (d) its radius
34. 34.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.🧭 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 135°, then left 180°, then left 120°. What does the gyro read now (0° to 359°)?
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
37. 37.Which of these suits wheels? (a) stepping over wide gaps (b) crossing stepping-stones (c) a long factory floor (d) flying over a field
38. 38.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
39. 39.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 90° (d) 360°
40. 40.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires

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