Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 147 · 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.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
2. 2.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a caster wheel (c) a servo (d) a track
3. 3.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) fast and easy on floors (d) they climb stairs
4. 4.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 90° (d) 360°
5. 5.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
7. 7.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
8. 8.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
9. 9.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they are too cheap (d) they never tire
10. 10.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
11. 11.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black soaks up light (d) black is hot
12. 12.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
13. 13.🧭 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 180°. It turns right 90°, then right 30°. What does the gyro read now (0° to 359°)?
14. 14.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
15. 15.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
16. 16.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
17. 17.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
18. 18.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) one wheel runs faster (d) it uses a sail
19. 19.🧭 A robot faces east. It does: turn around, turn left, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
22. 22.True or false: to feel a bump into a wall, use a gyro sensor. (a) False (b) True
23. 23.Which of these suits wheels? (a) soft snow (b) a field of tall boulders (c) a muddy building site (d) a long factory floor
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
25. 25.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster and weaker
26. 26.📡 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)?
27. 27.⬛ The threshold of a light sensor is … (a) the wheel size (b) the black/white cut-off (c) the top speed (d) the battery size
28. 28.📡 A robot is 140 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
29. 29.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
30. 30.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) sound is slow (c) to make it smaller (d) the sensor is half
31. 31.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.🧭 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 180°. It turns right 60°, then left 90°, then left 180°. What does the gyro read now (0° to 359°)?
33. 33.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
34. 34.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
35. 35.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
38. 38.🔍 Why do robots need sensors? (a) to know their world (b) to look colourful (c) to be heavier (d) to use more power
39. 39.⚙️ A 16-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
40. 40.Which job needs a distance sensor? (a) warn if motors get hot (b) measure how far a box is (c) measure a turn angle (d) follow a black line

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