Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 581 · 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.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an input (c) a gear (d) an output
2. 2.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black line (c) a black surface (d) a dark tunnel
3. 3.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) propellers (b) tracks (c) legs (d) wheels
4. 4.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
6. 6.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
7. 7.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
8. 8.Which job needs a touch sensor? (a) stop before a wall (b) warn if motors get hot (c) know a button is pressed (d) spot a red ball
9. 9.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
10. 10.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points right (b) points straight up (c) points left (d) points up and left
11. 11.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 38. What is under the sensor? (a) the white floor (b) the black line
13. 13.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
14. 14.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
16. 16.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 25. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
17. 17.🛞 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) turns left (c) goes straight back (d) spins right on the spot
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
19. 19.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driver gear (c) driven gear (d) idler gear
20. 20.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) tyres (c) spokes (d) pins
21. 21.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 90° (c) 180° (d) 360°
22. 22.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
23. 23.⚙️ A 30-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
24. 24.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 340 cm (c) 1 km (d) 34 cm
25. 25.⚙️ A 40-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
26. 26.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
27. 27.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
28. 28.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) backwards (d) nowhere
30. 30.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 20. What is under the sensor? (a) the black line (b) the white floor
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
32. 32.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) motor volts (d) number of gears
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 30. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
34. 34.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it uses a sail (c) it stops for ever (d) one wheel runs faster
35. 35.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) too fast on floors (c) harder to balance (d) they are too cheap
36. 36.🛞 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) spins right on the spot (b) turns left (c) stays still (d) goes straight back
37. 37.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its radius (d) its circumference
38. 38.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
39. 39.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
40. 40.True or false: “a hospital corridor” suits wheels. (a) False (b) True

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