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 two inclined planes placed together.

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Solution

a) This option is not correct because wheel barrow is class 2 lever
b) This is incorrect because the efficiency can't be 100 %, there is some energy loss due heat generation.
c) This statement is true "Friction in moving parts of a machine reduces its efficiency."

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a) This option is not correct because wheel barrow is class 2 leverb) This is incorrect because the efficiency can't be 100 %, there is some energy loss due heat generation.c) This statement is true "Friction in moving parts of a machine reduces its efficiency."

a) This option is not correct because wheel barrow is class 2 lever
b) This is incorrect because the efficiency can't be 100 %, there is some energy loss due heat generation.
c) This statement is true "Friction in moving parts of a machine reduces its efficiency."