Multiple Choice QuestionWhich is true about machines?Multiple choice question.Machines can increase speed.Machines can only increase speed.Machines can only decrease speed.Machines cannot change speed.

True or False: Speed has a direction

Multiple Choice QuestionThe three factors that impact a processor's speed are clock speed, word size, and ___ .Multiple choice question.bandwidthscreensizeping speedbus width

True or false, a simple machine is a tool with few or no moving parts that makes work easier.Question 1Select one:TrueFalseQuestion 2Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat is a gear?Question 2Select one:1.A modified wheel with a groove.2.A modified wheel made with metal.3.A modified wheel with teeth.Clear my choiceQuestion 3Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat is a spur gear?Question 3Select one:1.A gear with just one tooth. 2.A wheel with straight teeth around its edge.3.A gear that changes the moving direction of the gears by 90 degrees.Clear my choiceQuestion 4Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat does a crown gear do?Question 4Select one:1.Changes the moving direction of the gears by 180 degrees.2.Changes the moving direction of the gears by 90 degrees.3.Changes the moving direction of the gears by 45 degrees.Clear my choiceQuestion 5Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat is a bevel gear?Question 5Select one:1.Like crown gears, bevel gears change the direction of movement by 90 degrees.2.Like crown gears, bevel gears change the direction of movement by 180 degrees.3.Like crown gears, bevel gears change the direction of movement by 45 degrees.Clear my choiceQuestion 6Not yet answeredMarked out of 1Flag questionTipsQuestion textWhere can we find a bevel gear?Question 6Select one:1.Sewing Machines2.Hand Drills3.BicycleClear my choiceQuestion 7Not yet answeredMarked out of 1Flag questionTipsQuestion textHow many teeth can be found on a worm gear? Give your answer as a number, not in words.Answer:Question 7Question 8Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat does a worm gear often mesh with?Question 8Select one:1.A crown gear2.A spur gear3.A bevel gearClear my choiceQuestion 9Not yet answeredMarked out of 1Flag questionTipsQuestion textSelect an example of where worm gears are used?Question 9Select one:1.Security gates2.Clocks3.BicyclesClear my choiceQuestion 10Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat are helical gears?Question 10Select one:1.Similar to a bevel gear but the teeth are set at an angle.2.Similar to a spur gear but the teeth are set at an angle.3.Similar to a crown gear but the teeth are set at an angle.Clear my choiceQuestion 11Not yet answeredMarked out of 1Flag questionTipsQuestion textWhich of the following are advantages of helical gears?Question 11Select one or more:1.The angled teeth engage more gradually.2.They run quietly and smoothly.3.They allow a system to run faster.Question 12Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat’s the difference between an internal and external gear?Question 12Select one:1.An internal gear has its teeth on the inner surface, whereas an external gear has its teeth on the outer.2.An internal gear is used on the inside of a covered system, whereas an external gear is used on the outside and is uncovered.  3.An internal gear is set on the inner surface of an external gear.Clear my choiceQuestion 13Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat is a pawl and ratchet? Question 13Select one:1.A ratchet is a wheel with slanted teeth and a pawl is a type of wedge.2.A ratchet is a wheel with teeth at a 90° angle and a pawl is a type of lever.3.A ratchet is a wheel with slanted teeth and a pawl is a type of lever.Clear my choiceQuestion 14Not yet answeredMarked out of 1Flag questionTipsQuestion textWhich is the gear, the pawl or the rachet?Question 14Select one:1.The pawl2.The rachetClear my choiceQuestion 15Not yet answeredMarked out of 1Flag questionTipsQuestion textOn which of the following machines can we find a pawl and ratchet?Question 15Select one:1.Gearbox2.Elevator3.RollercoasterClear my choiceQuestion 16Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat is a rack and pinion?Question 16Select one:1.A gearing system which changes rotational motion into linear movement.  2.A gearing system which changes rotational motion into periodic movement.  3.A gearing system which changes rotational motion into reciprocating movement. Clear my choiceQuestion 17Not yet answeredMarked out of 1Flag questionTipsQuestion textWhere can a rack and pinion system be found?Question 17Select one:1.In automatic gates2.In clocks3.In a bicycleClear my choiceQuestion 18Not yet answeredMarked out of 1Flag questionTipsQuestion textWhat is a chain drive?Question 18Select one:1.A chain which is on a compound machine.2.A chain which meshes with gears.3.A chain which controls gears.Clear my choiceQuestion 19Not yet answeredMarked out of 1Flag questionTipsQuestion textHow does a chain drive work?Question 19Select one:1.The chain drive acts as an idler.2.The chain drive acts as an driver.3.The chain drive acts as an follower.Clear my choiceQuestion 20Not yet answeredMarked out of 1Flag questionTipsQuestion textWhere can we find a chain drive?Question 20Select one:1.A hand drill2.An elevator3.A bicycle

Which of these statements about algorithms is not true?Choose 1 answer:Choose 1 answer:(Choice A)   For many problems, there are algorithms that solve that problem more quickly than another algorithm.AFor many problems, there are algorithms that solve that problem more quickly than another algorithm.(Choice B)   There are some problems that no algorithm can solve in all cases.BThere are some problems that no algorithm can solve in all cases.(Choice C)   An algorithm that uses a heuristic will come up with the optimal solution more quickly than an algorithm that does not.CAn algorithm that uses a heuristic will come up with the optimal solution more quickly than an algorithm that does not.(Choice D)   Some algorithms take so long to solve a problem that there is not enough time left in the universe for them to complete.DSome algorithms take so long to solve a problem that there is not enough time left in the universe for them to complete.

My friend cannot run as fast as me.A.I cannot run faster than my friend.B.I can run faster as my friend.C.I can run faster more than my friend.D.I can run faster than my friend.