Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 97 · 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.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
2. 2.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
3. 3.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
4. 4.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
5. 5.🛞 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 4 times. How far does the robot roll (in cm)?
6. 6.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the wheel size (d) the black/white cut-off
7. 7.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it uses a sail (c) it jumps (d) one wheel runs faster
9. 9.True or false: “a long factory floor” suits propellers. (a) False (b) True
10. 10.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
11. 11.🛞 Circumference = π × … (a) radius only (b) speed (c) weight (d) diameter
12. 12.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a goldfish (d) a bat
13. 13.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
14. 14.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
15. 15.Which job needs a camera? (a) measure a turn angle (b) measure how far a box is (c) spot a red ball (d) feel a bump into a wall
16. 16.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🦾 A servo moves from 60° to 160°. How many degrees does it turn?
19. 19.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
20. 20.🔍 Which sensor helps a robot measure how far a box is? (a) a camera (b) a distance sensor (c) a gyro sensor (d) a light sensor
21. 21.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 59. What is under the sensor? (a) the white floor (b) the black line
22. 22.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a touch sensor
23. 23.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 90°. It turns right 45°, then left 45°. What does the gyro read now (0° to 359°)?
24. 24.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
25. 25.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
27. 27.🧭 How many degrees is a full turn? (a) 360° (b) 90° (c) 180° (d) 100°
28. 28.🧭 A robot should turn right 90°, but its gyro shows it turned 84°. How many degrees must it turn more to the right?
29. 29.🛞 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) stays still (b) goes straight forward (c) turns right (d) goes straight back
30. 30.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
31. 31.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
32. 32.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) between the two sensors (c) far behind it (d) under the left sensor
33. 33.📡 A robot is 270 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
34. 34.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
35. 35.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
36. 36.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
37. 37.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
38. 38.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
39. 39.Which of these suits wheels? (a) loose sand dunes (b) flying over a field (c) a muddy building site (d) a long factory floor
40. 40.Which job needs a temperature sensor? (a) follow a black line (b) warn if motors get hot (c) measure how far a box is (d) start on a hand clap

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