Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 823 · 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.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
2. 2.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
3. 3.📡 A robot is 290 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 4 seconds (in cm)?
4. 4.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
5. 5.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
6. 6.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the battery size (c) the top speed (d) the wheel size
7. 7.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
8. 8.🛞 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) stays still (c) goes straight forward (d) turns right
9. 9.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
10. 10.Which job needs a sound sensor? (a) start on a hand clap (b) follow a black line (c) stay balanced upright (d) find the brightest spot
11. 11.🧭 A robot spins 15° every second. How many seconds does it take to turn 105°?
12. 12.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 100° (d) 180°
13. 13.🛞 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) curves to the left (b) curves to the right (c) goes straight forward
14. 14.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
15. 15.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
16. 16.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
17. 17.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
18. 18.⚙️ 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
19. 19.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
20. 20.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) driver teeth (d) number of gears
21. 21.🔍 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
22. 22.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
23. 23.True or false: to warn if motors get hot, use a distance sensor. (a) True (b) False
24. 24.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
25. 25.📡 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
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.True or false: to find the brightest spot, use a light sensor. (a) False (b) True
28. 28.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
30. 30.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its radius (d) its circumference
31. 31.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 22/7 (c) 7/22 (d) 2/7
32. 32.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black soaks up light (d) black is loud
33. 33.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) teeth (d) pins
34. 34.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) legs (c) propellers (d) tracks
35. 35.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.Which job needs a gyro sensor? (a) read a QR code (b) warn if motors get hot (c) stay balanced upright (d) start on a hand clap
37. 37.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
38. 38.🧭 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 right 120°, then left 90°. What does the gyro read now (0° to 359°)?
39. 39.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
40. 40.🧭 A robot should turn right 90°, but its gyro shows it turned 101°. How many degrees must it turn back to the left?

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