If the capacitance of an capacitor is C = (εA)/d, which of the following parameters is varied when a variable capacitors is used for tuning radio sets?

The instrument that measures both ac and dc is called

A radioactive substance has a half life of 20 days. What fraction of the original radioactive nuclei will remain after 80 days?

If two charged plates are maintained at a potential difference of 3 kv, the work done in taking a charge of 600µc across the field is

In the diagram above, the pressure of the gas is

The frequency of the wave in the diagram above is

An engine of a car of power 80 kW moves on a rough road with a velocity of 32 ms-1. The forces required to bring it to rest is

A progressive wave equation is represented by y = a sin (150 πt - πt/4). if the phase difference of a progressive wave is 45o, the value of x in the equation is

A conductor has a diameter of 1.00mm and length of 2.00m. If the resistance of the material is 0.1Ω, the resistivity is