Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 642 · 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 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 left 30°, then left 180°. What does the gyro read now (0° to 359°)?
2. 2.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
3. 3.📡 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)?
4. 4.🧭 A robot faces east. It does: turn right, turn left, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
5. 5.🧭 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 left 180°. What does the gyro read now (0° to 359°)?
6. 6.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
7. 7.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) smell smoke (d) hear claps
8. 8.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) between the two sensors (c) under the left sensor (d) far behind it
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
11. 11.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
12. 12.🔍 Which sensor helps a robot warn if motors get hot? (a) a touch sensor (b) a gyro sensor (c) a temperature sensor (d) a distance sensor
13. 13.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
14. 14.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
15. 15.Which of these suits propellers? (a) a smooth classroom floor (b) a hospital corridor (c) crossing stepping-stones (d) flying over a field
16. 16.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
17. 17.🛞 Why do most indoor robots use wheels? (a) they float (b) they look funny (c) fast and easy on floors (d) they climb stairs
18. 18.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
19. 19.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 41. What is under the sensor? (a) the black line (b) the white floor
20. 20.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a dark tunnel (c) a black surface (d) a black line
21. 21.True or false: “a smooth classroom floor” suits legs. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
23. 23.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.True or false: to warn if motors get hot, use a touch sensor. (a) True (b) False
25. 25.🦾 A servo moves from 130° to 40°. How many degrees does it turn?
26. 26.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
27. 27.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
28. 28.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
30. 30.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) small (fast, weak) (d) never important
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.Which job needs a temperature sensor? (a) hear a whistle (b) read a QR code (c) find the brightest spot (d) warn if motors get hot
34. 34.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
35. 35.📡 A robot is 120 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)?
36. 36.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
37. 37.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a gyro sensor (c) a camera (d) a touch sensor
38. 38.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
39. 39.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it stops for ever (d) it jumps

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