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State if the following statement is true or false. Correct the statement if it is false.
A single movable pulley is a pulley that has its axis of rotation fixed.
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Answer the following in short.
Explain the various functions that a machine can perform.
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Answer the following in detail.
How does a pulley make work simpler?
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Differentiate between a single fixed pulley and a single movable pulley.
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Solve the following numerical problem.
What effort will be required to lift a load of 500 N by a single movable pulley? [Hint: Mechanical advantage of a single movable pulley is two].
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Select the correct alternative:
Wheel is used with axle because
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What are the wheel and axle? Give two examples.
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How does a wheel help in moving the axle?
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Name the machine to which the following belong:
Doorknob
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Select the correct statement :
(a) A wheel barrow is a lever of class I.
(b) The efficiency of a machine is always 100%
(c) Friction in moving parts of a machine reduces its efficiency.
(d) No lever has the mechanical advantage greater than 1.
(e) It is easier to lift a load vertically up than to push it along an inclined plane.
(f) A screw is made by two inclined planes placed together.
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State if the following statement is true or false. Correct the statement if it is false.
A rotation spindle tap is an example of a wheel-and-axle arrangement.
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State whether the following statement is True or False.
An inclined plane always has the mechanical advantage of more than 1.
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Fill in the blank:
Mechanical advantage of an inclined plane is always .................
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Name the machine to which the following belong:
Ramp
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What are magnetic keepers? Name its material.
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Tick the most appropriate answer.
The mechanical advantage of an inclined plane is always
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State if the following statement is true or false. Correct the statement if it is false.
A screw is a special case of an inclined plane.
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Give a reason for the following.
Magnets must be bandied with care?
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Answer the following in detail.
What is an inclined plane?
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