Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 683 · 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.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
2. 2.Which of these suits propellers? (a) deep mud (b) soft snow (c) a long factory floor (d) moving under water
3. 3.🔍 Why do robots need sensors? (a) to know their world (b) to use more power (c) to be heavier (d) to look colourful
4. 4.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 1 (d) 4
5. 5.📡 A robot is 160 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 10 seconds (in cm)?
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 75. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
7. 7.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
8. 8.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a track (d) a caster wheel
9. 9.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
10. 10.🛞 Circumference = π × … (a) radius only (b) diameter (c) speed (d) weight
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
12. 12.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
13. 13.True or false: “a long factory floor” suits wheels. (a) True (b) False
14. 14.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
15. 15.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a white surface (d) a dark tunnel
16. 16.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) not at all (d) faster but weaker
17. 17.🦾 A servo moves from 50° to 120°. How many degrees does it turn?
18. 18.🛞 Which way of moving suits this best: “a hospital corridor”? (a) wheels (b) propellers (c) tracks (d) legs
19. 19.🧭 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 0°. It turns left 30°, then left 135°, then left 30°. What does the gyro read now (0° to 359°)?
20. 20.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
22. 22.Which job needs a light sensor? (a) start on a hand clap (b) read a QR code (c) find the brightest spot (d) measure a turn angle
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
24. 24.🔍 Which sensor helps a robot warn if motors get hot? (a) a distance sensor (b) a camera (c) a temperature sensor (d) a gyro sensor
25. 25.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
26. 26.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) legs (c) tracks (d) wheels
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
28. 28.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
30. 30.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
31. 31.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
32. 32.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
33. 33.📡 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)?
34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
35. 35.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
36. 36.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) faster (c) slower (d) backwards
37. 37.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) black (d) the sky
38. 38.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) pins (d) teeth
39. 39.Which job needs a distance sensor? (a) stop before a wall (b) hear a whistle (c) feel a bump into a wall (d) spot a red ball
40. 40.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) sound too high to hear (d) radio music

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