Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 306 · 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 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
2. 2.📡 A robot is 250 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 8 seconds (in cm)?
3. 3.Which job needs a gyro sensor? (a) start on a hand clap (b) follow a black line (c) measure how far a box is (d) measure a turn angle
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
6. 6.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 360° (d) 100°
7. 7.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
8. 8.True or false: to know a button is pressed, use a light sensor. (a) True (b) False
9. 9.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
10. 10.🛞 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) goes straight back (c) goes straight forward (d) stays still
11. 11.🧭 A robot faces west. It does: turn around, turn left. Which way does it face now? (a) north (b) east (c) west (d) south
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 70. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
13. 13.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the wheel size (c) the battery size (d) the top speed
14. 14.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
15. 15.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
16. 16.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) in opposite directions (d) the same direction
19. 19.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
20. 20.🧭 A robot should turn right 45°, but its gyro shows it turned 47°. How many degrees must it turn back to the left?
21. 21.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) teeth (c) spokes (d) pins
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
24. 24.🔍 Which sensor helps a robot stop before a wall? (a) a gyro sensor (b) a distance sensor (c) a camera (d) a temperature sensor
25. 25.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they climb stairs (c) they float (d) they look funny
26. 26.True or false: to start on a hand clap, use a touch sensor. (a) True (b) False
27. 27.⚙️ A 24-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
28. 28.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
29. 29.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
30. 30.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
31. 31.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
32. 32.🔍 Why do robots need sensors? (a) to look colourful (b) to use more power (c) to be heavier (d) to know their world
33. 33.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) zero (d) small (fast, weak)
34. 34.True or false: “flying over a field” suits propellers. (a) True (b) False
35. 35.Which job needs a temperature sensor? (a) find the brightest spot (b) know a button is pressed (c) warn if motors get hot (d) measure a turn angle
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 40. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
37. 37.Which of these suits tracks? (a) stepping over wide gaps (b) flying over a field (c) deep mud (d) a smooth classroom floor
38. 38.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
39. 39.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) harder to balance (c) too fast on floors (d) they never tire
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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