Question

a seconds pendulum is suspended in an elevator moving with constant speed in downward direction. The periodic time (T) of that pendulum is____
a) less than 2 secs
b) equal to 2 secs
c) greater than 2 secs
d) very much greater than 2 secs

Answer 1

B is the correct option.
Hope it was helpful

Answer 2

T = 2π√l/g

When the elevator is moving at constant speed, the effective g is not changed. Hence time period will not change.

Since time period of seconds pendulum is 2seconds, answer is B.