Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 231 · 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 reading below the threshold means the sensor is over … (a) white (b) the sky (c) water (d) black
2. 2.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a white surface (c) a black line (d) a dark tunnel
3. 3.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
4. 4.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
5. 5.Which of these suits propellers? (a) soft snow (b) a muddy building site (c) loose sand dunes (d) hovering over a roof
6. 6.🛞 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 forward (b) spins right on the spot (c) goes straight back (d) turns left
7. 7.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 180° (d) 90°
8. 8.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
9. 9.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
10. 10.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 70. What is under the sensor? (a) the white floor (b) the black line
11. 11.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 73. What is under the sensor? (a) the black line (b) the white floor
12. 12.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
13. 13.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
14. 14.True or false: “a smooth classroom floor” suits tracks. (a) True (b) False
15. 15.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
16. 16.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
17. 17.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
18. 18.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the right sensor (d) under the left sensor
19. 19.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
20. 20.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times faster (d) 3 times slower
21. 21.🔍 Why do robots need sensors? (a) to know their world (b) to look colourful (c) to be heavier (d) to use more power
22. 22.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
23. 23.⚙️ A motor makes 250 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
24. 24.🛞 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
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 53. What is under the sensor? (a) the white floor (b) the black line
26. 26.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
27. 27.True or false: to find the brightest spot, use a light sensor. (a) False (b) True
28. 28.True or false: “a muddy building site” suits wheels. (a) False (b) True
29. 29.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) tyres (c) pins (d) teeth
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
31. 31.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it jumps (c) it uses a sail (d) it stops for ever
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
35. 35.📡 A robot is 260 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 46 seconds (in cm)?
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.📡 Why do we halve the echo’s total path? (a) sound is slow (b) it goes there and back (c) to make it smaller (d) the sensor is half
38. 38.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
39. 39.Which job needs a sound sensor? (a) feel a bump into a wall (b) stop before a wall (c) spot a red ball (d) start on a hand clap
40. 40.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points left (c) points right (d) points straight up

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