Subject :NSO Class : Class 9
Read the given statements and select the
correct option.
Statement 1 : Work done against friction
in moving a body over a closed path is
zero.
Statement 2 : Work done by a constant
force is always zero in a round trip of the
point of application of force.
A Both statements 1 and 2 are true and
statement 2 is the correct explanation
of statement 1.
B Both statements 1 and 2 are true
but statement 2 is not the correct
explanation of statement 1.
C Statement 1 is false but statement 2
is true.
D Both statements 1 and 2 are false.
Answer should be c as work done by any conservative forces in a closed loop is ALWAYS zero.