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All questions of Machines for Class 10 Exam
In a single fixed pulley, what is the mechanical advantage?- a) Equal to 1
- b) Greater than 1
- c) Less than 1
- d) Undefined
Correct answer is option 'A'. Can you explain this answer?
In a single fixed pulley, what is the mechanical advantage?
a)
Equal to 1
b)
Greater than 1
c)
Less than 1
d)
Undefined
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A single fixed pulley has a mechanical advantage of 1, meaning it does not reduce the effort needed to lift a load but can change the direction of the applied effort. This makes it useful for lifting loads with a more convenient pull direction.
What happens to the velocity ratio if the displacement of load is equal to the displacement of effort?- a) V.R. is less than 1
- b) V.R. is greater than 1
- c) V.R. is equal to 1
- d) V.R. cannot be determined
Correct answer is option 'C'. Can you explain this answer?
What happens to the velocity ratio if the displacement of load is equal to the displacement of effort?
a)
V.R. is less than 1
b)
V.R. is greater than 1
c)
V.R. is equal to 1
d)
V.R. cannot be determined
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If the displacement of the load is equal to the displacement of the effort, the velocity ratio (V.R.) is equal to 1. This indicates that the machine neither gains force nor speed, typically seen in systems that change the direction of effort.
In the context of levers, what does the term "fulcrum" refer to?- a) The pivot point about which the lever rotates
- b) The point where effort is applied
- c) The point where the load is applied
- d) The distance between load and effort
Correct answer is option 'A'. Can you explain this answer?
In the context of levers, what does the term "fulcrum" refer to?
a)
The pivot point about which the lever rotates
b)
The point where effort is applied
c)
The point where the load is applied
d)
The distance between load and effort
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The fulcrum is the pivot point around which a lever rotates. Understanding the location of the fulcrum is essential for determining how effectively a lever can amplify effort to lift a load.
What characterizes Class III levers?- a) Fulcrum is between load and effort
- b) Effort is between fulcrum and load
- c) Effort arm is longer than load arm
- d) Load is between fulcrum and effort
Correct answer is option 'B'. Can you explain this answer?
What characterizes Class III levers?
a)
Fulcrum is between load and effort
b)
Effort is between fulcrum and load
c)
Effort arm is longer than load arm
d)
Load is between fulcrum and effort
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In Class III levers, the effort is applied between the fulcrum and the load. This arrangement provides a mechanical advantage of less than 1, resulting in a gain in speed rather than force, such as in the action of lifting an arm.
What is the effect of friction on the efficiency of a machine?- a) No effect on efficiency
- b) Increases efficiency
- c) Decreases efficiency
- d) Makes efficiency equal to 1
Correct answer is option 'C'. Can you explain this answer?
What is the effect of friction on the efficiency of a machine?
a)
No effect on efficiency
b)
Increases efficiency
c)
Decreases efficiency
d)
Makes efficiency equal to 1
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Friction negatively impacts the efficiency of a machine by converting useful mechanical energy into thermal energy, leading to energy losses. This means that not all input energy is converted into useful work, reducing the overall efficiency.
What is the primary function of a machine in terms of force application?- a) To change the point of application of effort to a convenient location
- b) To increase the load without changing the effort
- c) To eliminate the need for effort altogether
- d) To decrease the load while increasing the effort
Correct answer is option 'A'. Can you explain this answer?
What is the primary function of a machine in terms of force application?
a)
To change the point of application of effort to a convenient location
b)
To increase the load without changing the effort
c)
To eliminate the need for effort altogether
d)
To decrease the load while increasing the effort
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A machine primarily serves to change the point of application of effort, making it easier to overcome a load. By allowing effort to be applied at a more convenient location, machines enhance efficiency and effectiveness in performing tasks.
In a block and tackle system, what is the general formula for the mechanical advantage?- a) M. = n
- b) M. = n/2
- c) M. = n^2
- d) M. = 2n
Correct answer is option 'D'. Can you explain this answer?
In a block and tackle system, what is the general formula for the mechanical advantage?
a)
M. = n
b)
M. = n/2
c)
M. = n^2
d)
M. = 2n
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In a block and tackle system, the mechanical advantage is calculated as M.A. = 2n, where n is the number of movable pulleys. This relationship allows for a significant reduction in the effort needed to lift heavy loads by distributing the load across multiple segments of rope.
Which of the following best describes the principle of moments in levers?- a) Load multiplied by the effort arm equals effort multiplied by the load arm
- b) Effort multiplied by the load arm equals load multiplied by the distance from the effort
- c) Load multiplied by the effort arm equals effort multiplied by the distance from the fulcrum
- d) Load multiplied by the load arm equals effort multiplied by the effort arm
Correct answer is option 'D'. Can you explain this answer?
Which of the following best describes the principle of moments in levers?
a)
Load multiplied by the effort arm equals effort multiplied by the load arm
b)
Effort multiplied by the load arm equals load multiplied by the distance from the effort
c)
Load multiplied by the effort arm equals effort multiplied by the distance from the fulcrum
d)
Load multiplied by the load arm equals effort multiplied by the effort arm
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The principle of moments states that the moment of the load about the fulcrum equals the moment of the effort about the fulcrum, which can be mathematically expressed as Load x Load Arm = Effort x Effort Arm. This relationship is fundamental in analyzing lever systems.
Which of the following statements is true about mechanical advantage (M.A.)?- a) M. cannot be calculated without units
- b) M. is the ratio of load to effort
- c) A machine with M. less than one is a force multiplier
- d) M. is always greater than one
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements is true about mechanical advantage (M.A.)?
a)
M. cannot be calculated without units
b)
M. is the ratio of load to effort
c)
A machine with M. less than one is a force multiplier
d)
M. is always greater than one
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Mechanical advantage is defined as the ratio of the load (L) to the effort (E) applied to overcome that load. A higher M.A. indicates that less effort is needed to lift a larger load, while M.A. less than one means more effort is required than the load being moved.
If the effort arm is shorter than the load arm, what can be inferred about the mechanical advantage?- a) M. cannot be determined
- b) M. is less than 1
- c) M. is equal to 1
- d) M. is greater than 1
Correct answer is option 'B'. Can you explain this answer?
If the effort arm is shorter than the load arm, what can be inferred about the mechanical advantage?
a)
M. cannot be determined
b)
M. is less than 1
c)
M. is equal to 1
d)
M. is greater than 1
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If the effort arm is shorter than the load arm, the mechanical advantage will be less than 1. This means that more effort is required to lift a given load, which is typical for Class III levers where effort is applied between the load and the fulcrum.
How is velocity ratio (V.R.) defined?- a) Load divided by effort
- b) Velocity of load divided by velocity of effort
- c) Velocity of effort divided by velocity of load
- d) Effort divided by load
Correct answer is option 'C'. Can you explain this answer?
How is velocity ratio (V.R.) defined?
a)
Load divided by effort
b)
Velocity of load divided by velocity of effort
c)
Velocity of effort divided by velocity of load
d)
Effort divided by load
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The velocity ratio (V.R.) is defined as the ratio of the velocity of effort (V.E.) to the velocity of load (V.L.). It shows how distances moved by effort and load relate during operation, and is crucial for understanding the efficiency of a machine.
In a single movable pulley, how does the mechanical advantage compare to a fixed pulley?- a) Less than 1
- b) Equal to 1
- c) Dependent on the weight of the pulley
- d) Greater than 1
Correct answer is option 'D'. Can you explain this answer?
In a single movable pulley, how does the mechanical advantage compare to a fixed pulley?
a)
Less than 1
b)
Equal to 1
c)
Dependent on the weight of the pulley
d)
Greater than 1
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A single movable pulley provides a mechanical advantage greater than 1, allowing the user to lift a heavier load with less effort by effectively distributing the load across multiple segments of rope.
What is a characteristic of an ideal machine?- a) It requires more effort than the load
- b) It has an efficiency of less than 100%
- c) It has a mechanical advantage of less than 1
- d) It operates with no energy loss
Correct answer is option 'D'. Can you explain this answer?
What is a characteristic of an ideal machine?
a)
It requires more effort than the load
b)
It has an efficiency of less than 100%
c)
It has a mechanical advantage of less than 1
d)
It operates with no energy loss
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An ideal machine operates with no energy loss, meaning the work output equals the work input, resulting in 100% efficiency. However, in practical applications, real machines always incur some energy loss due to factors like friction and material imperfections.
When using a combination of pulleys, what is the effect of adding more movable pulleys?- a) Decreases velocity ratio
- b) Has no effect on efficiency
- c) Increases mechanical advantage
- d) Decreases mechanical advantage
Correct answer is option 'C'. Can you explain this answer?
When using a combination of pulleys, what is the effect of adding more movable pulleys?
a)
Decreases velocity ratio
b)
Has no effect on efficiency
c)
Increases mechanical advantage
d)
Decreases mechanical advantage
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Adding more movable pulleys increases the mechanical advantage of the system. Each additional pulley segment allows for a greater load to be lifted with less effort, enhancing the efficiency of the lifting operation.
Which type of lever is exemplified by the action of raising the weight of the body on the toes?- a) Class II lever
- b) Class III lever
- c) Class IV lever
- d) Class I lever
Correct answer is option 'A'. Can you explain this answer?
Which type of lever is exemplified by the action of raising the weight of the body on the toes?
a)
Class II lever
b)
Class III lever
c)
Class IV lever
d)
Class I lever
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The action of raising the weight of the body on the toes is a Class II lever, where the load (the weight of the body) is between the fulcrum (the ball of the foot) and the effort (the muscles in the calf). This configuration effectively amplifies force.
Which class of lever has the fulcrum located between the effort and the load?- a) Class III lever
- b) Class I lever
- c) Class IV lever
- d) Class II lever
Correct answer is option 'B'. Can you explain this answer?
Which class of lever has the fulcrum located between the effort and the load?
a)
Class III lever
b)
Class I lever
c)
Class IV lever
d)
Class II lever
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Class I levers have the fulcrum positioned between the effort and the load. This configuration allows for the potential to amplify either force or speed, depending on the relative lengths of the effort arm and load arm.
What does an efficiency of a machine represent?- a) The relationship between load and effort
- b) The mechanical advantage of the machine
- c) The ratio of work input to work output
- d) The ratio of useful work output to work input
Correct answer is option 'D'. Can you explain this answer?
What does an efficiency of a machine represent?
a)
The relationship between load and effort
b)
The mechanical advantage of the machine
c)
The ratio of work input to work output
d)
The ratio of useful work output to work input
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Efficiency is defined as the ratio of useful work output to work input, often expressed as a percentage. It indicates how effectively a machine converts input energy into useful work, with 100% efficiency being ideal, though rarely achieved in practice due to energy losses.
What is the unit of mechanical advantage?- a) Pascal
- b) No unit
- c) Joule
- d) Newton
Correct answer is option 'B'. Can you explain this answer?
What is the unit of mechanical advantage?
a)
Pascal
b)
No unit
c)
Joule
d)
Newton
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Mechanical advantage has no unit because it is the ratio of two similar quantities (load and effort). This dimensionless nature allows for easy comparison of different machines and mechanisms without the influence of units.
Which class of lever is known to always act as a force multiplier?- a) Class III
- b) None of the above
- c) Class II
- d) Class I
Correct answer is option 'C'. Can you explain this answer?
Which class of lever is known to always act as a force multiplier?
a)
Class III
b)
None of the above
c)
Class II
d)
Class I
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Class II levers always act as force multipliers because the effort arm is longer than the load arm, allowing a smaller effort to lift a larger load. This principle is used in many common tools, such as wheelbarrows.
What is the relationship between mechanical advantage and velocity ratio for an ideal machine?- a) M. = V.R.
- b) M. <>
- c) No relationship exists
- d) M. > V.R.
Correct answer is option 'A'. Can you explain this answer?
What is the relationship between mechanical advantage and velocity ratio for an ideal machine?
a)
M. = V.R.
b)
M. <>
c)
No relationship exists
d)
M. > V.R.
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For an ideal machine, the mechanical advantage is equal to the velocity ratio. This indicates that there are no energy losses in an ideal setting, which is a theoretical concept as real machines always have some energy loss due to factors like friction.
Chapter doubts & questions for Machines - Physics Class 10 ICSE 2025 is part of Class 10 exam preparation. The chapters have been prepared according to the Class 10 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 10 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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Physics Class 10 ICSE
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