Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 899 · 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: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
2. 2.🛞 Which way of moving suits this best: “soft snow”? (a) wheels (b) tracks (c) legs (d) propellers
3. 3.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
4. 4.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
5. 5.📡 A robot is 160 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 15 seconds (in cm)?
6. 6.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
7. 7.Which job needs a gyro sensor? (a) feel a bump into a wall (b) measure how far a box is (c) measure a turn angle (d) find the brightest spot
8. 8.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) nowhere (c) slower (d) backwards
9. 9.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight back (b) stays still (c) turns left (d) spins right on the spot
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
12. 12.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) one wheel runs faster (c) it jumps (d) it uses a sail
13. 13.🛞 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) turns right (b) stays still (c) goes straight forward (d) goes straight back
14. 14.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the wheel size (d) the black/white cut-off
15. 15.📡 A robot is 260 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
16. 16.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
17. 17.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to use more power (d) to look colourful
19. 19.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) faster but weaker (c) not at all (d) slower but stronger
20. 20.⚙️ 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 big driver gear (b) a small driver gear
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
22. 22.True or false: “a long factory floor” suits wheels. (a) True (b) False
23. 23.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they look funny (d) they climb stairs
24. 24.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
26. 26.Which job needs a gyro sensor? (a) spot a red ball (b) stay balanced upright (c) know a button is pressed (d) measure how far a box is
27. 27.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
28. 28.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🔍 Which sensor helps a robot stay balanced upright? (a) a light sensor (b) a temperature sensor (c) a gyro sensor (d) a distance sensor
30. 30.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) pins (c) tyres (d) spokes
31. 31.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
32. 32.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
33. 33.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
34. 34.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a touch sensor (c) a sound sensor (d) a camera
35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
36. 36.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
37. 37.🦾 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 right (c) points up and left (d) points up and right
38. 38.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 17. What is under the sensor? (a) the white floor (b) the black line
39. 39.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
40. 40.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) harder to balance (d) they are too cheap

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