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Class XI

PHYSICS

Chapter-14-OSCILLATIONS

WORKSHEET-2

1.
A spring of spring constant K is cut into two pieces such that their lengths are in
the ratio 1:2, then the force constant of the bigger piece will be

a. 3K.
b. 2K.

c. K/2.

d. (3/2) K.

2.
When a mass is attached to a spring, its length is increased by 20 cm. It is now
further lowered and released. The time period is

a. 2 /7 sec.

b. 7 sec.

c. 2 sec.

d. 7 /2 sec.

3.
A second pendulum is mounted in a rocket. Its period of oscillation will decrease
when rocket is

a. moving up with uniform velocity.

b. moving up with uniform acceleration.

c. moving down with uniform acceleration.

d. moving in a geostationary orbit.

4.
The length of a spring is l and its force constant is k. When a weight W is
suspended from it, its length increases by x. If the spring is cut into two equal
parts and put in parallel and the same weight W is suspended from them, then
extension will be

a. 2x.
b. x.

c. x/2.

d. x/4.

5.
If the spring extends by x on loading and if T is the tension in the spring, then the
energy stored by the spring is