Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 121 · 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.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
2. 2.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 1 km (d) 34 cm
3. 3.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
4. 4.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 22/7 (c) 7/22 (d) 2/7
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
7. 7.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
8. 8.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
9. 9.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.True or false: “a flat road” suits wheels. (a) False (b) True
11. 11.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) at the same speed (c) not at all (d) slower but stronger
12. 12.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its weight (d) its radius
13. 13.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) too fast on floors (c) harder to balance (d) they are too cheap
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
15. 15.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
16. 16.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a metal door (c) a wooden box (d) a soft foam cushion
17. 17.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
18. 18.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
19. 19.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
21. 21.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
22. 22.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a touch sensor (c) a gyro sensor (d) a light sensor
23. 23.⚙️ A motor makes 320 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🛞 Why do most indoor robots use wheels? (a) they look funny (b) fast and easy on floors (c) they float (d) they climb stairs
26. 26.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 46. What is under the sensor? (a) the black line (b) the white floor
27. 27.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black surface (d) a black line
28. 28.True or false: “soft snow” suits tracks. (a) False (b) True
29. 29.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) teeth (d) spokes
30. 30.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it jumps (d) it stops for ever
31. 31.🧭 A robot faces north. It does: turn left, turn around, turn around, turn left. Which way does it face now? (a) east (b) north (c) west (d) south
32. 32.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
33. 33.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
34. 34.⚙️ A motor makes 50 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
35. 35.🧭 A robot should turn right 45°, but its gyro shows it turned 52°. How many degrees must it turn back to the left?
36. 36.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.Which job needs a touch sensor? (a) know a button is pressed (b) spot a red ball (c) follow a black line (d) find the brightest spot
38. 38.🧭 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 right 135°, then right 60°, then right 60°. What does the gyro read now (0° to 359°)?
39. 39.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
40. 40.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor

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