Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 801 · 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 motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 85. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
3. 3.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
4. 4.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its circumference (d) its diameter
5. 5.Which job needs a sound sensor? (a) spot a red ball (b) measure how far a box is (c) hear a whistle (d) measure a turn angle
6. 6.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black line (c) a dark tunnel (d) a black surface
7. 7.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
8. 8.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
9. 9.⚙️ A 75-tooth driver gear turns a 15-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
11. 11.🧭 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 270°. It turns left 120°, then left 45°, then left 90°. What does the gyro read now (0° to 359°)?
12. 12.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
13. 13.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
14. 14.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 22 (d) 7/22
15. 15.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
17. 17.🧭 A robot should turn right 45°, but its gyro shows it turned 38°. How many degrees must it turn more to the right?
18. 18.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
19. 19.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
20. 20.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) black (d) water
21. 21.🔍 Which sensor helps a robot start on a hand clap? (a) a gyro sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
22. 22.🧭 A robot should turn right 180°, but its gyro shows it turned 182°. How many degrees must it turn back to the left?
23. 23.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
24. 24.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.⚙️ A 30-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
26. 26.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a gear (c) a servo (d) a caster wheel
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a distance sensor (c) a gyro sensor (d) a light sensor
29. 29.📡 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
30. 30.⚙️ A motor makes 150 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?
31. 31.📡 A robot is 240 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 5 seconds (in cm)?
32. 32.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
33. 33.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
34. 34.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) nowhere (c) faster (d) backwards
35. 35.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) legs (c) propellers (d) wheels
36. 36.Which job needs a light sensor? (a) find the brightest spot (b) measure how far a box is (c) stop before a wall (d) stay balanced upright
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 70. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
39. 39.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) smell smoke (d) turn by exact angles
40. 40.🛞 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 forward (b) spins left on the spot (c) goes straight back (d) turns right

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