Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 190 · 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 gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
2. 2.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its circumference (c) its weight (d) its diameter
3. 3.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) harder to balance (c) too fast on floors (d) they are too cheap
4. 4.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
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 left 135°, then left 120°, then right 60°. What does the gyro read now (0° to 359°)?
6. 6.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black line (d) a black surface
7. 7.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are shiny (c) they spin in the air (d) they are round
8. 8.🦾 A servo program runs:
   angle = 140
   angle = angle − 40
   angle = angle + 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “crossing stepping-stones” suits legs. (a) True (b) False
10. 10.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
11. 11.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.📡 A robot is 120 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
13. 13.📡 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?
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
15. 15.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
16. 16.🔍 What does a gyro sensor measure? (a) temperature (b) colour (c) turning (rotation) (d) sound
17. 17.🛞 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) stays still (b) goes straight back (c) turns left (d) goes straight forward
18. 18.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
19. 19.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
20. 20.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a touch sensor (c) a temperature sensor (d) a gyro sensor
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
22. 22.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
23. 23.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
24. 24.🧭 A robot spins 90° every second. How many seconds does it take to turn 180°?
25. 25.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
26. 26.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a touch sensor (c) a sound sensor (d) a gyro sensor
27. 27.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
28. 28.🧭 A robot faces north. It does: turn right, turn right, turn right. Which way does it face now? (a) north (b) east (c) south (d) west
29. 29.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 360° (d) 90°
30. 30.🧭 A robot faces south. It does: turn right, turn left. Which way does it face now? (a) east (b) west (c) south (d) north
31. 31.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
32. 32.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
33. 33.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) water (d) black
34. 34.🛞 Circumference = π × … (a) speed (b) radius only (c) weight (d) diameter
35. 35.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
36. 36.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
37. 37.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) fast and easy on floors (d) they look funny
38. 38.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 72. What is under the sensor? (a) the black line (b) the white floor
39. 39.🛞 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 3 times. How far does the robot roll (in cm)?
40. 40.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =

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