Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 900 · 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.🔍 Which sensor helps a robot warn if motors get hot? (a) a camera (b) a touch sensor (c) a temperature sensor (d) a gyro sensor
2. 2.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
3. 3.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a flat wall (d) a soft foam cushion
4. 4.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
5. 5.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 45. What is under the sensor? (a) the black line (b) the white floor
6. 6.🔍 Which sensor helps a robot follow a black line? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a camera
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
8. 8.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
9. 9.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
10. 10.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) faster and weaker (c) not at all (d) at the same speed
11. 11.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight forward (b) turns right (c) spins left on the spot (d) stays still
12. 12.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
13. 13.True or false: to find the brightest spot, use a gyro sensor. (a) False (b) True
14. 14.🔍 Which sensor helps a robot start on a hand clap? (a) a touch sensor (b) a camera (c) a gyro sensor (d) a sound sensor
15. 15.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
16. 16.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 63. What is under the sensor? (a) the white floor (b) the black line
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
18. 18.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) driver gear (d) tyre
19. 19.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
20. 20.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it jumps (c) it uses a sail (d) one wheel runs faster
21. 21.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
22. 22.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🔍 Which sensor helps a robot spot a red ball? (a) a temperature sensor (b) a camera (c) a distance sensor (d) a touch sensor
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 80. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
25. 25.Which of these suits legs? (a) moving under water (b) deep mud (c) a muddy building site (d) a field of tall boulders
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
27. 27.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
29. 29.🛞 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 backward. What does the robot do? (a) turns right (b) stays still (c) spins right on the spot (d) goes straight forward
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo moves from 130° to 20°. How many degrees does it turn?
32. 32.🛞 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 12 times. How far does the robot roll (in cm)?
33. 33.🧭 A robot should turn right 45°, but its gyro shows it turned 43°. How many degrees must it turn more to the right?
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
35. 35.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
36. 36.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
37. 37.⚙️ A 15-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
38. 38.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) water drops (d) sound too high to hear
39. 39.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
40. 40.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) black (d) the sky

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