Physics Test - ...

The capacity of a parallel plate condenser is  without dielectric. Dielectric constant of 2 is used to fill half thickness between the plates the capacitance is _______ μF.

Effective resistance between A & B in the given circuit is

Two long straight conductors carry currents 4 A and 2 A into the plane of paper. A circular path is imagined to be enclosing these currents. The value of ∮B .dl is

A bar magnet is suspended in a uniform magnetic field in a position where it experiences maximum torque. The angle through which it must be rotated from this position such that it experiences half of the maximum torque is

A sample containing 16 g of a radioactive substance has half-life period of 2 days. After 32 days the amount of the radioactive substance left in the sample is

Let v₁ and v₂ be the maximum velocities of the emitted electrons when the surface of a metal is illuminated with light waves of energy E₁ = 4 eV and E₂ = 2.5 eV. respectively.

If the work function of the metal is 2 eV, then the ratio v₁/v₂ is ____________.

Figure shows a ray of light entering and passing through a dense glass slab and emerging from the other side. If the angle i = 60°, slab thickness b = 0.04m and the refractive index of glass = √3, the parallel shift ‘d’ between the emerging and entering rays in mm is

The intensity of the central bright fringe is I_o. If one of the slits is covered, the intensity at the same point is

The average self-induced emf in a 25 m H solenoid when the current in it falls from 0.2 A to 0 A in 0.01 second, is