Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 981 · 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.📡 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?
2. 2.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
3. 3.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) water drops (c) sound too high to hear (d) bright light
4. 4.🔍 Which sensor helps a robot spot a red ball? (a) a camera (b) a gyro sensor (c) a light sensor (d) a touch sensor
5. 5.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
6. 6.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
8. 8.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
9. 9.🔍 Which sensor helps a robot know a button is pressed? (a) a camera (b) a temperature sensor (c) a touch sensor (d) a light sensor
10. 10.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
11. 11.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
12. 12.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it jumps (c) it uses a sail (d) it stops for ever
13. 13.🛞 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) spins left on the spot (b) goes straight forward (c) spins right on the spot (d) turns left
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a wooden box (d) a metal door
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
17. 17.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
18. 18.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 4 (d) 3
19. 19.Which job needs a touch sensor? (a) spot a red ball (b) know a button is pressed (c) hear a whistle (d) measure a turn angle
20. 20.🧭 A robot faces north. It does: turn right, turn right, turn left. Which way does it face now? (a) south (b) north (c) west (d) east
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
22. 22.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
23. 23.Which job needs a gyro sensor? (a) start on a hand clap (b) stop before a wall (c) warn if motors get hot (d) stay balanced upright
24. 24.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
25. 25.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
27. 27.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) fast and easy on floors (d) they float
28. 28.🧭 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 45°, then right 120°. What does the gyro read now (0° to 359°)?
29. 29.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
30. 30.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
31. 31.Which of these suits wheels? (a) flying over a field (b) a smooth classroom floor (c) stepping over wide gaps (d) soft snow
32. 32.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
33. 33.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
34. 34.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
35. 35.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
36. 36.⚙️ 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?
37. 37.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
38. 38.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
39. 39.⚙️ A 30-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
40. 40.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?

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