Physics Test-19...

Which of the following is a good conductor of electricity?

As the temperature increases, the thermal conductivity of a gas __________.

The figure below shows a network of eight resistors numbered \(1\) to \(8\) each equal to \(2~ \Omega\), connected to a \(3 ~V\) battery of negligible internal resistance. The current \(I\) in the circuit is:

If the direction of flow of current is opposite in the two parallel wires separated by a small distance, then the wires will:

Which of the following formulae for kinetic energy E given below can be ruled out on the basis of dimensional arguments?

Given: d = density, V = Volume, m =  mass of body in kg, c and u are velocity (m/s), acceleration, a = m/s², SI unit of energy is joules = kg m² s^-2.

According to Gauss’s law, if \(E\) is _________, the charge density in the ideal conductor is zero.

The Electromagnetic Waves are:

A ball is dropped from a height of \(80~ m\). The distance travelled by it in the fourth second will be _______.

(take \(g=10~ m / s ^{2}\) )

What is the S.I. unit of power?

In the potentiometer circuit shown in the figure, the balance point with \({R}=10 \Omega\) when switch \({S}_{1}\) is closed and \({S}_{2}\) is open is \(50cm,\) while that when \({S}_{2}\) is closed and \({S}_{1}\) is open is \(60cm\). What is the value of \({X} ?\)