Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 655 · 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.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
2. 2.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.🦾 A servo program runs:
   angle = 170
   angle = angle − 10
   angle = angle + 20
   angle = angle − 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
5. 5.🦾 A servo moves from 40° to 0°. How many degrees does it turn?
6. 6.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
7. 7.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
8. 8.🧭 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 180°, then right 90°. What does the gyro read now (0° to 359°)?
9. 9.🦾 A servo moves from 50° to 120°. How many degrees does it turn?
10. 10.🛞 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 right (c) stays still (d) goes straight forward
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
12. 12.⬛ The threshold of a light sensor is … (a) the top speed (b) the black/white cut-off (c) the wheel size (d) the battery size
13. 13.Which of these suits propellers? (a) flying over a field (b) a field of tall boulders (c) loose sand dunes (d) deep mud
14. 14.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) slower but stronger (c) at the same speed (d) not at all
15. 15.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) spins right on the spot (b) turns right (c) stays still (d) goes straight forward
16. 16.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.⚙️ A motor makes 300 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
18. 18.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
20. 20.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
21. 21.Which job needs a camera? (a) follow a black line (b) spot a red ball (c) feel a bump into a wall (d) measure a turn angle
22. 22.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
23. 23.True or false: to feel a bump into a wall, use a gyro sensor. (a) True (b) False
24. 24.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) teeth (d) spokes
25. 25.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points straight up (c) points left (d) points right
26. 26.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
27. 27.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
28. 28.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its circumference (c) its weight (d) its diameter
29. 29.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
31. 31.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points up and right (c) points up and left (d) points right
32. 32.Which of these suits wheels? (a) stepping over wide gaps (b) a smooth classroom floor (c) moving under water (d) flying over a field
33. 33.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they float (c) they climb stairs (d) they look funny
34. 34.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
35. 35.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
36. 36.🧭 How many degrees is a right-angle turn? (a) 90° (b) 180° (c) 360° (d) 45°
37. 37.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
38. 38.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 29. What is under the sensor? (a) the white floor (b) the black line
39. 39.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
40. 40.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids