Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 494 · 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 distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.⚙️ 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 big driver gear (b) a small driver gear
3. 3.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
4. 4.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
5. 5.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the wheel size (d) the top speed
6. 6.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
7. 7.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
8. 8.Which job needs a temperature sensor? (a) feel a bump into a wall (b) stop before a wall (c) warn if motors get hot (d) hear a whistle
9. 9.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
10. 10.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it jumps (c) it uses a sail (d) one wheel runs faster
11. 11.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
12. 12.Which job needs a light sensor? (a) hear a whistle (b) stay balanced upright (c) measure how far a box is (d) find the brightest spot
13. 13.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) tracks (c) legs (d) wheels
14. 14.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) sound (d) turning (rotation)
15. 15.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
16. 16.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) tracks (c) wheels (d) propellers
17. 17.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
18. 18.🧭 A robot faces south. It does: turn left, turn right, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
19. 19.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) propellers (c) legs (d) wheels
20. 20.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
21. 21.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) to make it smaller (d) it goes there and back
22. 22.⚙️ A motor makes 120 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
24. 24.🧭 A robot faces west. It does: turn around, turn right. Which way does it face now? (a) east (b) north (c) south (d) west
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 37. What is under the sensor? (a) the black line (b) the white floor
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
29. 29.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 63. What is under the sensor? (a) the black line (b) the white floor
30. 30.📡 A robot is 170 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
31. 31.🛞 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)?
32. 32.🛞 Which way of moving suits this best: “moving under water”? (a) wheels (b) tracks (c) propellers (d) legs
33. 33.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
34. 34.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a snail (d) a bat
35. 35.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
36. 36.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
38. 38.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) white (d) water
39. 39.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right

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