Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 925 · 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 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 360° (d) 180°
3. 3.🦾 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 right (c) points straight up (d) points up and left
4. 4.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
5. 5.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
6. 6.True or false: “a flat road” suits propellers. (a) False (b) True
7. 7.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) slower (c) backwards (d) faster
8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
9. 9.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
10. 10.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
11. 11.🔍 Which sensor helps a robot measure a turn angle? (a) a touch sensor (b) a light sensor (c) a gyro sensor (d) a camera
12. 12.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the black/white cut-off (d) the wheel size
13. 13.🛞 Circumference = π × … (a) radius only (b) diameter (c) weight (d) speed
14. 14.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
15. 15.Which of these suits legs? (a) soft snow (b) stepping over wide gaps (c) a long factory floor (d) hovering over a roof
16. 16.🧭 A robot faces west. It does: turn right, turn right, turn right, turn around. Which way does it face now? (a) south (b) east (c) north (d) west
17. 17.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
18. 18.Which of these suits wheels? (a) loose sand dunes (b) moving under water (c) a hospital corridor (d) crossing stepping-stones
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
21. 21.🧭 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 270°. It turns right 180°, then right 60°, then right 45°. What does the gyro read now (0° to 359°)?
22. 22.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its radius (c) its diameter (d) its weight
23. 23.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
25. 25.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) number of gears (d) motor volts
26. 26.Which job needs a light sensor? (a) measure how far a box is (b) start on a hand clap (c) know a button is pressed (d) find the brightest spot
27. 27.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
28. 28.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
29. 29.Which of these suits wheels? (a) stepping over wide gaps (b) hovering over a roof (c) soft snow (d) a smooth classroom floor
30. 30.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 7/22 (c) 22 (d) 2/7
31. 31.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
32. 32.📡 A robot is 290 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
33. 33.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
34. 34.True or false: “flying over a field” suits propellers. (a) False (b) True
35. 35.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
36. 36.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) goes straight back (b) stays still (c) turns left (d) spins left on the spot
38. 38.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
39. 39.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
40. 40.🧭 A robot should turn right 180°, but its gyro shows it turned 192°. How many degrees must it turn back to the left?

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