Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 250 · 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.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.🛞 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 10 times. How far does the robot roll (in cm)?
3. 3.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
4. 4.⚙️ 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
5. 5.📡 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)?
6. 6.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is wet (d) black is loud
7. 7.🧭 A robot faces north. It does: turn left, turn right, turn right, turn around. Which way does it face now? (a) north (b) west (c) east (d) south
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
9. 9.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) small (fast, weak) (d) zero
11. 11.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) legs (c) tracks (d) wheels
12. 12.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they look funny (d) they climb stairs
13. 13.⚙️ A motor makes 150 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
14. 14.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times louder (d) 3 times bigger
15. 15.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
16. 16.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle − 20
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.📡 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
18. 18.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points straight up
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
20. 20.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are round (c) they spin in the air (d) they are shiny
21. 21.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
22. 22.🛞 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 forward (b) turns left (c) spins left on the spot (d) stays still
23. 23.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) not at all (c) faster but weaker (d) slower but stronger
24. 24.Which of these suits legs? (a) soft snow (b) a flat road (c) a field of tall boulders (d) a long factory floor
25. 25.🧭 A robot spins 45° every second. How many seconds does it take to turn 315°?
26. 26.🔍 Which sensor helps a robot read a QR code? (a) a distance sensor (b) a touch sensor (c) a camera (d) a temperature sensor
27. 27.Which job needs a light sensor? (a) feel a bump into a wall (b) find the brightest spot (c) stay balanced upright (d) start on a hand clap
28. 28.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
29. 29.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
30. 30.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
31. 31.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
32. 32.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.⚙️ 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
34. 34.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the top speed (c) the battery size (d) the wheel size
35. 35.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
36. 36.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.Which of these suits wheels? (a) soft snow (b) flying over a field (c) deep mud (d) a long factory floor
39. 39.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
40. 40.📡 A robot is 260 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 26 seconds (in cm)?

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