UNN Physics 2018/2019 - Model 2 Past Questions

An electric drill rated 400W is used to drill a hole in a copper of mass 400g in 20s. Calculate the rise in temperature if all the heat produced is absorbed by the copper.[specific heat capacity of copper = 400Jkg^-1K^-1]

Dew point is not affected by

The ability of a wave to spread around corners is called

A p-n junction diode is used as

The battery connection that permits current to flow across a p-n junction is called

The process through which free elections leave the surface of hot metals is known as

The electrolyte in the Nickel-iron (Nife) accumulator is

When an a.c. voltage is applied to a capacitor, no power is consumed because the current

An ammeter of resistance 50 has a full-scale deflection when a current of 50mA flows in it. The value of the resistor required to adapt it to measure a current of 5A is

Which of the following factors does not affect the electric resistance of a wire?

Which of the following phenomena supports the theory that waves have a particle nature?

A body of mass Mkg rests on a plane inclined at an angle θ to the horizontal. The component of the weight of the body parallel to the plane is

Refraction of light differs from reflection in that, in refraction:
I. at least two media are involved.
II. there is change in the direction of the ray.
III. the speed of the ray changes.
Which of the statement(s) is/are correct?

Which of the following factors will increase the sensitivity of a moving coil meter?

A nuclide represented as ${^70_32X}$ has a neutrons - proton ration of