Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 242 · 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 robot is 100 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 5 seconds (in cm)?
2. 2.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
3. 3.🔍 Which sensor helps a robot measure how far a box is? (a) a sound sensor (b) a gyro sensor (c) a touch sensor (d) a distance sensor
4. 4.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) in opposite directions (d) they do not turn
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
6. 6.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
7. 7.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo moves from 80° to 100°. How many degrees does it turn?
10. 10.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 7. What is under the sensor? (a) the white floor (b) the black line
11. 11.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) sound (c) colour (d) temperature
12. 12.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) tracks (c) propellers (d) wheels
13. 13.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) tyre (c) driver gear (d) driven gear
14. 14.True or false: “stepping over wide gaps” suits legs. (a) False (b) True
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
18. 18.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 2 (d) 4
19. 19.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
20. 20.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black soaks up light (d) black is wet
21. 21.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) bright light (c) radio music (d) water drops
23. 23.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
24. 24.🧭 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 left 30°, then right 120°, then left 120°. What does the gyro read now (0° to 359°)?
25. 25.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
26. 26.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 40. What is under the sensor? (a) the black line (b) the white floor
27. 27.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a cow (d) a snail
28. 28.🧭 A robot faces south. It does: turn right, turn left. Which way does it face now? (a) north (b) east (c) west (d) south
29. 29.🧭 A robot should turn right 180°, but its gyro shows it turned 190°. How many degrees must it turn back to the left?
30. 30.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the black line (b) the white floor
31. 31.🛞 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 2 times. How far does the robot roll (in cm)?
32. 32.🛞 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 6 times. How far does the robot roll (in cm)?
33. 33.📡 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?
34. 34.Which of these suits wheels? (a) soft snow (b) deep mud (c) a smooth classroom floor (d) a muddy building site
35. 35.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) tracks (c) legs (d) propellers
36. 36.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
37. 37.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero
38. 38.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
40. 40.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small

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