Oscillations CBSE Questions & Answers

Oscillations

This is Physics Class 11 Oscillations CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

If the length of a simple pendulum is increases by 1percent, then the new time-period

A
Increases by 2.0 percent
B
Increases by 1 percent
Correct
C
Decreases by 0.5 percent
D
Increases by 0.5 percent

Two pendulums have time periods T and 5T/4. They are in phase at their mean positions at some instant of time. What will be their phase difference when the bigger pendulum completes one oscillation?

A
45\(^0\)
Correct
B
90\(^0\)
C
30\(^0\)
D
60\(^0\)

A particle is executing S.H.M of amplitude a with a time period T sec. The time taken by it to move from positive extreme position to half the amplitude is

A
T/12 sec
B
2T/12 sec
Correct
C
6T/12 sec
D
3T /12 sec

The period of a simple pendulum is doubled when

A
Its length is increased four times
Correct
B
Its length is doubled
C
The mass of the bob is doubled
D
The mass of the bob and the length of the pendulum are doubled

A mass M is suspended by two springs which are connected in series. If the spring constants are K1 and K2 then the time period of the vertical vibrations is

A
T=2 \(\pi \sqrt {{{M({k_1}{k_2})} \over {({k_1} + {k_2})}}} \)
B
T=2 \(\pi \sqrt {{{M({k_1} + {k_2})} \over {({k_1}{k_2})}}} \)
Correct
C
T=2 \(\pi \) \(\sqrt {\left\{ {{M \over {({k_1} + {k_2})}}} \right\}} \)
D
T=2 \(\pi \sqrt {\left\{ {{M \over {({k_1} - {k_2})}}} \right\}} \)

Whose motion is an ideal case of SHM?

A
None of these
B
A simple pendulum with very small angle of swing
C
An electric dipole placed stably in a uniform electric field and then given a very small regular displacement
Correct
D
Shadow of a point mass having uniform circular motion, on the vertical diameter

A particle executes SHM of time period T, the time period with which the total energy changes is

A
T/2
B
2T
C
Infinite
Correct
D
T

The length of a second’s pendulum decreases by 0.1percent, then the clock

A
Gains 43.2 seconds per day
Correct
B
Loses 43.2 seconds per day
C
Loses 13.5 seconds per day
D
. Loses 7 seconds per day

A ball of mass 50 gm is suspended by a spring with a force constant K=49 N/m. The ball is raised to the position at which the spring is not tensioned and is released without a push. The ball will fall through a maximum distance of

A
0.03 m
B
0.02 m
C
0.04 m
D
0.01 m
Correct

A cylinder floats vertically in a tank full of water. The period of oscillation of the cylinder when depressed and released is dependent on

A
The mass of the cylinder
B
Density of the liquid
C
The area of cross section of the cylinder
Correct
D
Length of cylinder immersed in the liquid at equilibrium

A particle is oscillating according to the equation X=7 cos 0.5 \(\pi \)t, where t is in seconds. The point moves from the position of equilibrium to maximum displacement in time

A
2.0 seconds
Correct
B
1.0 seconds
C
4.0 seconds
D
0.5 seconds

A weightless spring which has a force constant k oscillates with frequency n when a mass m is suspended from it. The spring is cut into two equal halves and a mass 2m is suspended from it. The frequency of oscillation will now become

A
2n
B
n/\(\sqrt 2 \)
C
n
Correct
D
2n/\(\sqrt 2 \)

The displacement of a particle executing S.H.M is given by y=0.25 sin 200 t cm. The maximum speed of the particle is

A
50 cm/sec
B
100 cm/sec
Correct
C
200 cm/sec
D
0.25 cm/sec

Which of the following equations does not represent simple harmonic motion

A
. Y=A \({\rm{si}}{{\rm{n}}^{\rm{2}}}\)\(\omega \) t \({\rm{co}}{{\rm{s}}^{\rm{2}}}\)\(\omega \) t
B
Y=A sin \(\omega \) t cos \(\omega \) t
C
Y=A sin \(\omega \) t + Bcos \(\omega \) t
D
Y= A \({\rm{si}}{{\rm{n}}^{\rm{2}}}\) \(\omega \) t
Correct

The vertical extension in a light spring by a weight of 1 kg suspended from the wire is 9.8 cm. The period of oscillation is

A
2 \(\pi \) sec
B
2 \(\pi \) /10 sec
Correct
C
20 \(\pi \) sec
D
200\(\pi \) sec