Physics
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.
Machines
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Answer
(a) Incorrect : A wheel barrow is a Class II lever.
(b) Incorrect : The efficiency of a machine is always less than 100%.
(c) Correct
(d) Incorrect : Class II levers have mechanical advantage greater than 1.
(e) Incorrect : It is easier to push a load along an inclined plane than to lift it vertically up.
(f) Incorrect : A wedge is made by two inclined planes placed together.
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