Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 952 · 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 motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
2. 2.Which job needs a camera? (a) read a QR code (b) follow a black line (c) know a button is pressed (d) find the brightest spot
3. 3.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a gyro sensor
4. 4.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
5. 5.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 4 (c) 3 (d) 2
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
7. 7.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
8. 8.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) tracks (c) propellers (d) legs
9. 9.🛞 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) goes straight forward (b) curves to the right (c) curves to the left
10. 10.🧭 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 left 60°, then left 45°. What does the gyro read now (0° to 359°)?
11. 11.🛞 Which way of moving suits this best: “a muddy building site”? (a) tracks (b) propellers (c) wheels (d) legs
12. 12.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
13. 13.📡 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)?
14. 14.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
15. 15.Which job needs a touch sensor? (a) feel a bump into a wall (b) stay balanced upright (c) measure how far a box is (d) find the brightest spot
16. 16.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its diameter (d) its circumference
17. 17.Which job needs a sound sensor? (a) start on a hand clap (b) measure a turn angle (c) spot a red ball (d) warn if motors get hot
18. 18.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 28. What is under the sensor? (a) the white floor (b) the black line
19. 19.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
20. 20.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
21. 21.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
23. 23.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
24. 24.🧭 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 45°, then left 45°, then right 45°. What does the gyro read now (0° to 359°)?
25. 25.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and left (b) points straight up (c) points right (d) points up and right
26. 26.True or false: “loose sand dunes” suits wheels. (a) False (b) True
27. 27.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) spins right on the spot (c) goes straight forward (d) stays still
28. 28.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
29. 29.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) propellers (c) wheels (d) legs
30. 30.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
31. 31.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
32. 32.True or false: “a hospital corridor” suits wheels. (a) True (b) False
33. 33.Which job needs a light sensor? (a) follow a black line (b) start on a hand clap (c) measure how far a box is (d) stop before a wall
34. 34.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) an output (d) a wheel
35. 35.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
36. 36.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) small (fast, weak) (d) zero
37. 37.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
38. 38.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) driver gear (d) tyre
39. 39.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) not at all (c) faster but weaker (d) slower but stronger
40. 40.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor

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