Physics Test 11...

Figure shows a capillary tube of radius r dipped into water. If the atmospheric pressure is  the pressure at point A is

Ultrasonic waves emitted by dolphins have a frequency of 250 kHz. Their wavelength in water is nearly 

The ratio of velocity of sound through a gas to the r.m.s. velocity of the gas molecules is ----------

The angular frequency of motion whose equation is given by  is (y = displacement and t= time)

Match list I & list II & select the correct answer given below:

In a stationary wave

I. all the particles perform simple harmonic motion

II. all the particles between two adjacent nodes vibrate in phase

III. the amplitude of particle vibration at an antinode is equal to that of either component wave

IV. particles on opposite sides of a node vibrate with a phase difference of π

The M.I. of a disc of mass M and radius R about an axis, which is tangential to the circumference of the disc and parallel to its diameter is

The M.I. of a body (initially at rest) about a given axis is 1.2 kgm². In order to produce a rotational K.E. of 1500 J, an angular acceleration of 25  must be applied about that axis for a period of

The centre of a wheel rolling on a plane surface moves with a speed  A particle on the rim of the wheel at the same level as the centre will be moving at speed

Three identical rods, each of length l are joined to form a rigid equilateral triangle. Its radius of gyration about an axis passing through a corner and perpendicular to the plane of the triangle is