Question

The least count of a stop watch is 1/5
second. The
time of 20 oscillations of a pendulum is measured
to be 25 seconds. The maximum percentage error
in the measurement of time will be
(1) 0.1%
(2) 0.8%
(3) 1.8%
(4) 8%​

Answer 1

Answer:

22.

If S denotes the sum of first n terms of the A.P. a +

(a + d) + (a + 2d) + ....... whose nth term is L, then

the common 'd' of the A.P. is :-

l- a

(1)

(2)

e2-a2

2S-a + €

n

2.

(3)

e² – a2

2S- (a + l)

(4) None of