Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 536 · 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 motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
2. 2.🧭 A robot spins 30° every second. How many seconds does it take to turn 240°?
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
4. 4.🔍 Which sensor helps a robot start on a hand clap? (a) a touch sensor (b) a gyro sensor (c) a sound sensor (d) a light sensor
5. 5.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) motor volts (d) number of gears
6. 6.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
7. 7.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
8. 8.🧭 A robot faces north. It does: turn right, turn right, turn left, turn right. Which way does it face now? (a) east (b) south (c) west (d) north
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
10. 10.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
11. 11.Which job needs a gyro sensor? (a) know a button is pressed (b) spot a red ball (c) measure a turn angle (d) start on a hand clap
12. 12.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points up and left (c) points left (d) points right
14. 14.Which of these suits wheels? (a) a muddy building site (b) a smooth classroom floor (c) soft snow (d) hovering over a roof
15. 15.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.🛞 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) goes straight back (b) spins right on the spot (c) goes straight forward (d) turns right
17. 17.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster and weaker
18. 18.⬛ A reading below the threshold means the sensor is over … (a) water (b) black (c) white (d) the sky
19. 19.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
20. 20.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1188 cm?
21. 21.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) fast and easy on floors (c) they look funny (d) they float
22. 22.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
23. 23.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 32 times. How many times does the driven gear turn?
24. 24.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
25. 25.🛞 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 2 times. How far does the robot roll (in cm)?
26. 26.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) pins (d) teeth
27. 27.📡 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)?
28. 28.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
29. 29.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
30. 30.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
32. 32.🧭 A robot faces south. It does: turn around, turn right. Which way does it face now? (a) north (b) west (c) south (d) east
33. 33.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) sound is slow (c) the sensor is half (d) to make it smaller
34. 34.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
35. 35.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 45° (d) 90°
36. 36.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
37. 37.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
38. 38.Which of these suits propellers? (a) a smooth classroom floor (b) moving under water (c) loose sand dunes (d) a long factory floor
39. 39.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) wheels (c) propellers (d) tracks
40. 40.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?

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