CBSE
Multiple Choice QuestionsA bottle weighing 220 g and of area of cross-section 50 cm2, and height 4 cm oscillates on the surface of water in vertical position. Its frequency of oscillation is
1.5 Hz
2.5 Hz
3.5 Hz
4.5 Hz
A 5.5 metre length of string has a mass of 0.035 kg. If the tension in the string is 77 N, the velocity of the wave on the string is
210 m s-1
40 m s-1
110 m s-1
55 m s-1
A wave is represented by the equation y= 0.5 sin(10t x) metre It is a travelling wave propagating along +x direction with velocity
10 m s-1
20 m s-1
5 m s-1
None of these
Motion of an oscillating liquid in a U tube is
periodic but not simple harmonic.
non-periodic.
simple harmonic and time period is independent of the density of the liquid.
simple harmonic and time period is directly proportional to the density of the liquid.
Assertion: The graph of potential energy and kinetic energy of a particle in SHM with respect to position is a parabola.
Reason: Potential energy and kinetic energy do not vary linearly with position.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: The periodic time of a hard spring is less as compared to that of a soft spring.
Reason: The periodic time depends upon the spring constant, which is large for hard spring.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
A simple pendulum performs simple harmonic motion about x = 0 with an amplitude ' a ' and time period ' T '. The speed of the pendulum at x = a/2 will be
The frequency of oscillations of a mass m connected horizontally by a spring of spring constant k is 4 Hz. When the spring is replaced by two identical spring as shown in figure. Then the effective frequency is
4
1.5
1.31
2
The time period of a particle undergoing SHM is 16 s. It starts motion from the mean position. After 2 s, its velocity is 0.4 m s-1 .The amplitude is
1.44 m
0.72 m
2.88 m
0.36 m
A mass M is suspended from a spring of negligible mass. The spring is pulled a little and then released so that the mass executes simple harmonic oscillations with a time period T. If the mass is increased by m, then the time period becomes . The ratio of is
9/16
5/4
25/16
4/5
