Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 850 · 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 should turn right 45°, but its gyro shows it turned 30°. How many degrees must it turn more to the right?
2. 2.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) the sensor is half (d) sound is slow
3. 3.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
4. 4.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
5. 5.🔍 Which sensor helps a robot start on a hand clap? (a) a camera (b) a sound sensor (c) a gyro sensor (d) a distance sensor
6. 6.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
7. 7.True or false: to read a QR code, use a camera. (a) False (b) True
8. 8.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
10. 10.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
11. 11.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) harder to balance (c) too fast on floors (d) they never tire
12. 12.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
14. 14.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
15. 15.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
16. 16.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
17. 17.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) fast and easy on floors (d) they look funny
18. 18.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
19. 19.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
20. 20.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) the same direction (c) in opposite directions (d) one up, one down
21. 21.True or false: “a hospital corridor” suits tracks. (a) True (b) False
22. 22.Which job needs a gyro sensor? (a) warn if motors get hot (b) stay balanced upright (c) read a QR code (d) stop before a wall
23. 23.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 56. What is under the sensor? (a) the black line (b) the white floor
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
25. 25.Which of these suits propellers? (a) deep mud (b) flying over a field (c) a field of tall boulders (d) a hospital corridor
26. 26.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster and weaker
27. 27.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) big (slow and strong) (d) never important
28. 28.True or false: “soft snow” suits wheels. (a) True (b) False
29. 29.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
30. 30.🔍 Which sensor helps a robot measure a turn angle? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a gyro sensor
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
32. 32.True or false: “a field of tall boulders” suits legs. (a) False (b) True
33. 33.True or false: “a hospital corridor” suits wheels. (a) True (b) False
34. 34.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight back (b) spins right on the spot (c) spins left on the spot (d) turns right
35. 35.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
36. 36.📡 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?
37. 37.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.🛞 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 backward. What does the robot do? (a) turns right (b) spins right on the spot (c) spins left on the spot (d) goes straight back
39. 39.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
40. 40.⚙️ A motor makes 440 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?

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