Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 827 · 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 big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster but weaker
2. 2.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is hot (d) black is loud
3. 3.True or false: “a long factory floor” suits wheels. (a) False (b) True
4. 4.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) the sky (d) black
5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
6. 6.📡 A robot is 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 9 seconds (in cm)?
7. 7.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
8. 8.🧭 A robot faces west. It does: turn around, turn left. Which way does it face now? (a) west (b) north (c) east (d) south
9. 9.Which job needs a sound sensor? (a) start on a hand clap (b) read a QR code (c) feel a bump into a wall (d) follow a black line
10. 10.📡 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)?
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
12. 12.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
13. 13.🛞 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 back (b) spins right on the spot (c) turns left (d) goes straight forward
14. 14.Which of these suits wheels? (a) stepping over wide gaps (b) a hospital corridor (c) loose sand dunes (d) crossing stepping-stones
15. 15.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a touch sensor
16. 16.🔢 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
17. 17.📡 A robot is 130 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
18. 18.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
20. 20.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) fast and easy on floors (d) they float
21. 21.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
22. 22.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
23. 23.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
25. 25.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
26. 26.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
27. 27.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
28. 28.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
29. 29.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 46. What is under the sensor? (a) the black line (b) the white floor
30. 30.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
31. 31.True or false: “a hospital corridor” suits wheels. (a) False (b) True
32. 32.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to know their world (d) to use more power
33. 33.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
34. 34.🛞 Which way of moving suits this best: “a hospital corridor”? (a) wheels (b) legs (c) tracks (d) propellers
35. 35.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
36. 36.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
37. 37.🦾 A servo moves from 100° to 60°. How many degrees does it turn?
38. 38.🧭 A robot should turn right 180°, but its gyro shows it turned 195°. How many degrees must it turn back to the left?
39. 39.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
40. 40.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?

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