Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 52 · 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 light sensor reads below 40 over a black line and above 40 over the white floor. It reads 36. What is under the sensor? (a) the black line (b) the white floor
2. 2.🛞 Circumference = π × … (a) speed (b) radius only (c) diameter (d) weight
3. 3.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
4. 4.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
5. 5.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) goes straight back (b) turns left (c) turns right (d) goes straight forward
6. 6.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
7. 7.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
8. 8.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
9. 9.Which job needs a gyro sensor? (a) follow a black line (b) start on a hand clap (c) stay balanced upright (d) spot a red ball
10. 10.⚙️ A motor makes 450 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
11. 11.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
12. 12.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
13. 13.True or false: to read a QR code, use a light sensor. (a) True (b) False
14. 14.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
15. 15.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
16. 16.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 40 seconds (in cm)?
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.🧭 A robot faces east. It does: turn left, turn around. Which way does it face now? (a) west (b) north (c) south (d) east
19. 19.True or false: to stop before a wall, use a temperature sensor. (a) True (b) False
20. 20.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) spokes (d) teeth
23. 23.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they spread the weight (d) they are shiny
24. 24.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
25. 25.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) too fast on floors (c) they are too cheap (d) harder to balance
26. 26.Which job needs a touch sensor? (a) feel a bump into a wall (b) read a QR code (c) stay balanced upright (d) start on a hand clap
27. 27.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
28. 28.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 65. What is under the sensor? (a) the white floor (b) the black line
29. 29.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns left (b) stays still (c) spins right on the spot (d) turns right
30. 30.🧭 A robot spins 15° every second. How many seconds does it take to turn 120°?
31. 31.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times slower (d) 3 times faster
32. 32.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a white surface (c) a dark tunnel (d) a black line
33. 33.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) propellers (c) wheels (d) tracks
34. 34.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
36. 36.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 90° (d) 360°
37. 37.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
38. 38.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
40. 40.True or false: to hear a whistle, use a light sensor. (a) False (b) True

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