Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 54 · 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 way of moving suits this best: “moving under water”? (a) propellers (b) wheels (c) legs (d) tracks
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
3. 3.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) sound is slow (c) to make it smaller (d) the sensor is half
4. 4.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
5. 5.🔍 Which sensor helps a robot hear a whistle? (a) a touch sensor (b) a sound sensor (c) a light sensor (d) a gyro sensor
6. 6.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
7. 7.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.⚙️ A 15-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
10. 10.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
11. 11.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
13. 13.🧭 A robot spins 15° every second. How many seconds does it take to turn 225°?
14. 14.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
15. 15.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
16. 16.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a metal door (c) a wooden box (d) a flat wall
17. 17.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
18. 18.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
19. 19.Which of these suits tracks? (a) loose sand dunes (b) moving under water (c) a flat road (d) a long factory floor
20. 20.🧭 A robot should turn right 90°, but its gyro shows it turned 82°. How many degrees must it turn more to the right?
21. 21.🧭 A robot spins 30° every second. How many seconds does it take to turn 60°?
22. 22.🛞 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) spins right on the spot (b) turns right (c) stays still (d) goes straight back
23. 23.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
25. 25.📡 A robot is 240 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 44 seconds (in cm)?
26. 26.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
27. 27.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
28. 28.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its radius (d) its circumference
29. 29.Which job needs a sound sensor? (a) measure a turn angle (b) know a button is pressed (c) start on a hand clap (d) warn if motors get hot
30. 30.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
31. 31.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
32. 32.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
33. 33.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
34. 34.🛞 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 back (b) stays still (c) goes straight forward (d) turns right
35. 35.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) driver teeth (d) wheel size
36. 36.⚙️ A 30-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
37. 37.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 64. What is under the sensor? (a) the white floor (b) the black line
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 80. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
40. 40.True or false: “spins round and round” is true of a servo motor. (a) True (b) False

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