Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 183 · 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.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) never important (d) big (slow and strong)
2. 2.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
3. 3.🛞 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) stays still (b) spins right on the spot (c) spins left on the spot (d) turns left
4. 4.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
5. 5.Which job needs a touch sensor? (a) know a button is pressed (b) follow a black line (c) find the brightest spot (d) measure how far a box is
6. 6.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 77. What is under the sensor? (a) the black line (b) the white floor
7. 7.Which of these suits wheels? (a) flying over a field (b) stepping over wide gaps (c) a muddy building site (d) a long factory floor
8. 8.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) smell smoke (d) hear claps
9. 9.🛞 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) spins right on the spot (b) spins left on the spot (c) stays still (d) turns right
10. 10.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points left (b) points straight up (c) points right (d) points up and left
11. 11.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) between the two sensors (c) far behind it (d) under the left sensor
12. 12.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
14. 14.🧭 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 0°. It turns left 30°, then right 135°. What does the gyro read now (0° to 359°)?
15. 15.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
16. 16.🧭 A robot should turn right 45°, but its gyro shows it turned 48°. How many degrees must it turn back to the left?
17. 17.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
18. 18.🛞 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) spins left on the spot (b) turns left (c) stays still (d) goes straight back
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
21. 21.⚙️ 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
22. 22.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster but weaker
23. 23.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) to make it smaller (d) it goes there and back
24. 24.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 90° (d) 360°
25. 25.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
26. 26.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) wheels (c) tracks (d) propellers
27. 27.🧭 A robot should turn right 180°, but its gyro shows it turned 176°. How many degrees must it turn more to the right?
28. 28.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
30. 30.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
31. 31.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
32. 32.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a black line (d) a white surface
33. 33.Which of these suits propellers? (a) soft snow (b) a long factory floor (c) a flat road (d) moving under water
34. 34.⚙️ A motor makes 90 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
35. 35.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
37. 37.🧭 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 0°. It turns left 135°, then left 180°. What does the gyro read now (0° to 359°)?
38. 38.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a caster wheel (d) a track
39. 39.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🔍 Which sensor helps a robot hear a whistle? (a) a sound sensor (b) a gyro sensor (c) a camera (d) a light sensor

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