UNN Physics 2012/2013 Past Questions

The force on a current carrying conductor in a magnetic field is greatest when the

A magnetic field is said to exist at a point if a force is

In an a.c. circuit that contains only a capacitor, the voltage lags behind the current by

The particle emitted when ³⁹₁₉K decays to ³⁹₁₉ is

The particle and wave nature of matter is

The ray which causes gas molecules to glow is

If the distance between two suspended masses 10kg each is tripled, the gravitational force of attraction between them

If the radius of the earth is 6.4 x 10⁶ m, the escape velocity of a satellite from the earth is ..... (take g = m/s²)

If a body of mass 5kg is thrown vertically upwards with a velocity U, at what height will the potential energy be equal to the kinetic energy?

The rate of heat loss by a body is proportional to the

In a gas experiment, the pressure of the gas is plotted against reciprocal of the volume of the gas at constant temperature, the unit of the slope of the resulting curve is

A bar of initial length l_o is heated through a temperature range Δθ to a new length l. The linear expansivity of the bar is

The real depth of a pond is 6.0m. A boy observes a fish at the bottom of the pond. What is the apparent depth if the refractive index is 4/3?

If U is the object distance and V the image distance, which of the following expressions gives the linear magnification produced by a convex lens of focal length f?

A light wave has a wavelength of 5oonm in air. The frequency of the wave is