Physics Test 23...

In an LCR series a.c. circuit, the voltage across each of the components. L, C and R is 50 V. The voltage across the LC combination will be:

Find equivalent capacitance across AB (all capacitances in μF)

A point object O moves from the principal axis of a converging lens in a direction OP. I, the image of O, will move initially in the direction

For a prism kept in air it is found that for an angle of incidence 60°, the angle of prism 'A', angle of deviation 'δ' and angle of emergence 'e' become equal. Then the refractive index of the prism is

Two conducting spheres of radii r and 3r initially have charges 3q and q respectively. Their separation is much larger than their radii. If they are joined by a conductor of high resistance, the force between them will

Hydrogen (₁H¹), Deuterium (₁H²), singly ionised Helium (₂He⁴)⁺ and double ionised lithium (₃Li⁶)⁺⁺ all have one electron around the nucleus. Consider an electron transition from n = 2 to n = 1. If the wave lengths of emitted radiation are λ₁, λ₂, λ₃ and λ₄ respectively then approximately which one of the following is correct ?

In the figure, the vertical sections of the string are long.

A is released from rest from the position shown.

When a rubber-band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx² where a and b are constants. The work done in stritching the unstretched rubber-band by L is

A uniform rod of mass m is bent into the form of a semicircle of radius R. The moment of inertia of the rod about an axis passing through A and perpendicular to the plane of the paper is

In a Young’s double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by