Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 340 · 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.🦾 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 up and right (b) points up and left (c) points left (d) points straight up
2. 2.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a flat wall (d) a wooden box
3. 3.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
4. 4.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times bigger (d) 3 times louder
5. 5.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) black (d) the sky
6. 6.Which job needs a distance sensor? (a) hear a whistle (b) measure a turn angle (c) stop before a wall (d) know a button is pressed
7. 7.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
8. 8.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
9. 9.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
11. 11.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
12. 12.⚙️ A motor makes 100 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
13. 13.🧭 A robot faces south. It does: turn left, turn right, turn around, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
14. 14.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black surface (c) a dark tunnel (d) a black line
15. 15.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) pins (d) teeth
16. 16.Which job needs a camera? (a) hear a whistle (b) stop before a wall (c) spot a red ball (d) know a button is pressed
17. 17.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they are shiny (d) they spread the weight
18. 18.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a sound sensor (d) a gyro sensor
19. 19.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) nowhere (c) faster (d) backwards
20. 20.True or false: to stay balanced upright, use a light sensor. (a) False (b) True
21. 21.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 180° (d) 90°
22. 22.True or false: “a smooth classroom floor” suits legs. (a) False (b) True
23. 23.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the right sensor (c) under the left sensor (d) between the two sensors
24. 24.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
25. 25.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
26. 26.🦾 A servo moves from 120° to 90°. How many degrees does it turn?
27. 27.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
28. 28.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
29. 29.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
30. 30.🛞 Which way of moving suits this best: “a flat road”? (a) tracks (b) legs (c) wheels (d) propellers
31. 31.📡 A robot is 150 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 20 seconds (in cm)?
32. 32.Which job needs a temperature sensor? (a) warn if motors get hot (b) measure how far a box is (c) feel a bump into a wall (d) measure a turn angle
33. 33.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
34. 34.📡 A robot is 220 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 25 seconds (in cm)?
35. 35.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 70. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
37. 37.⚙️ A motor makes 480 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
38. 38.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a light sensor (c) a sound sensor (d) a camera
39. 39.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
40. 40.True or false: “deep mud” suits tracks. (a) False (b) True

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