Assignment
1. A simple pendulum has time period T. The bob is given negative charge and surface below it is given positive charge. The new time period will be [AFMC 2004]
7. A hollow sphere is filled with water through a small hole in it. It is then hung by a long thread and made to oscillate. As the water slowly flows out of the hole at the bottom, the period of oscillation will
[MP PMT 1994; KCET 1994; RPET 1996; AFMC 2000; CBSE PMT 2000; CPMT 2001]
(a) Continuously decrease (b) Continuously increase
(c) First decrease and then increase (d) First increase and then decrease
8 The period of oscillation of a
simple pendulum of constant length at earth surface is T. Its period inside a mine is
[CPMT 1973; DPMT 2001]
(a) Greater
than T (b) Less
than T (c) Equal
to T (d) Cannot be compared
9. Infinite springs with force constants k, 2k, 4k and 8k…. respectively are connected in series. The effective force constant of the spring will be [J & K CET 2004]
(a) 2k (b) k (c) k/2 (d) 2048
10. A spring has length l and spring constant k. if spring is divided in two equal parts then spring constant is [Bihar CEE 2004]
(a) k (b) k/2 (c) 2k (d) 4k
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