Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 92 · 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.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 45° (d) 90°
2. 2.🔍 Which sensor helps a robot start on a hand clap? (a) a camera (b) a touch sensor (c) a sound sensor (d) a gyro sensor
3. 3.Which job needs a gyro sensor? (a) measure a turn angle (b) stop before a wall (c) hear a whistle (d) read a QR code
4. 4.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
5. 5.🧭 A robot spins 45° every second. How many seconds does it take to turn 135°?
6. 6.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 77. What is under the sensor? (a) the black line (b) the white floor
7. 7.🧭 A robot faces west. It does: turn around, turn around. Which way does it face now? (a) north (b) east (c) south (d) west
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.🧭 How many degrees is a full turn? (a) 360° (b) 90° (c) 180° (d) 100°
10. 10.📡 A robot is 160 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
11. 11.True or false: “flying over a field” suits wheels. (a) False (b) True
12. 12.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
13. 13.🧭 A robot should turn right 90°, but its gyro shows it turned 105°. How many degrees must it turn back to the left?
14. 14.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
15. 15.True or false: to read a QR code, use a camera. (a) False (b) True
16. 16.📡 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
17. 17.🛞 Circumference = π × … (a) radius only (b) speed (c) diameter (d) weight
18. 18.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) in opposite directions (c) the same direction (d) one up, one down
19. 19.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
20. 20.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
22. 22.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) spokes (c) tyres (d) pins
23. 23.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is hot (d) black is loud
24. 24.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
25. 25.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
26. 26.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
27. 27.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
28. 28.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
30. 30.True or false: to start on a hand clap, use a sound sensor. (a) True (b) False
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
32. 32.⚙️ A motor makes 350 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
33. 33.True or false: to stop before a wall, use a distance sensor. (a) False (b) True
34. 34.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
35. 35.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
36. 36.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
37. 37.🛞 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) turns left (b) goes straight forward (c) spins right on the spot (d) stays still
38. 38.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
39. 39.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
40. 40.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear

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