Questions in Oscillations

Select	Question
	The ratio of frequencies of two pendulums are $2 : 3$, then their length are in ratio
	Two pendulums begin to swing simultaneously. If the ratio of the frequency of oscillations of the two is $7 : 8$, then the ratio of lengths of the two pendulums will be
	A simple pendulum hanging from the ceiling of a stationary lift has a time period $T_1$. When the lift moves downward with constant velocity, the time period is $T_2$, then
	If the length of a pendulum is made 9 times and mass of the bob is made 4 times then the value of time period becomes
	A simple pendulum is taken from the equator to the pole. Its period
	A pendulum of length 2m lift at P. When it reaches Q, it losses 10% of its total energy due to air resistance. The velocity at Q is
	There is a simple pendulum hanging from the ceiling of a lift. When the lift is stand still, the time period of the pendulum is $T$. If the resultant acceleration becomes $g/4,$ then the new time period of the pendulum is
	The period of a simple pendulum measured inside a stationary lift is found to be $T$. If the lift starts accelerating upwards with acceleration of $g/3,$then the time period of the pendulum is
	Time period of a simple pendulum will be double, if we
	Length of a simple pendulum is $l$ and its maximum angular displacement is $\theta$, then its maximum K.E. is