CGPET 2018 Solved Paper

The period of oscillation of simple pendulum,
T1=2π√

l

g

........(i)
When the lift starts accelerating upwards with uniform acceleration, the period,
T2=2π√

l

g+a

.......(ii)
From Eqs. (i) and (ii), we get
T1>T2
Hence, the period will be shorter.