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qUESTIONS

The upward force due to surface tension (7) in a capillary tube is balancing downward weight of 75 ×10-⁴ N The inner circumference of the tube is:

A soap bubble of radius 1/√π cm is expanded to have double the radius. If surface tension of soap solution is 30 dyne/ cm, then the work done is:

When liquid flows through a tube, the Reynold’s number is 1500. the flow of liquid is:

The excess pressure inside a soap bubble of volume ‘V1’ is twice the excess pressure inside a second soap bubble of volume ‘ V2’ The value of V1/V2 is:

A steel coin of thickness ‘d’ and density ‘p’ is floating on water of surface tension ‘7″. The radius of the coin (R) is: [ g =acceleration due to gravity.]

On introducing a thin film in the path of one of the two interfering beams, the central fringe will shift by one fringe width. If n=1.5, the thickness of the film is (wavelength of monochromatic light is λ)

In Young’s double slit experiment, wavelength of light used is ‘λ’. The intensity at a point is ‘I’, where the path-difference is ‘λ/3’. If Io denotes the maximum intensity, the ratio I/Io is

The interference pattern is obtained with two coherent light sources of intensity ratio ‘n’. The ratio (Imax-Imin / Imax +Imin) will be

The thickness of a plate having refractive index ‘u’ which will produce a change in optical path equal to half the wavelength ‘λ’ of the light passing through it is

If the ratio of the intensities of two waves producing interference is 49:16, then the ratio of the resultant maximum intensity of minimum intensity will be

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