Physics Test - ...

Atoms having the same number of neutrons, but different number of electrons or protons are called?

Two long straight conductors \(A O B\) and \(C O D\) are perpendicular to each other and carry currents \(i_{1}\) and \(i_{2}\). The magnitude of the magnetic induction at a point \(P\) at a distance a from the point \(O\) in a direction perpendicular to the plane \(A B C D\) is :

In the winter season, a mild spark is often seen when a man touches somebody's else's skin. Why?

Which of the following is not the property of equipotential surfaces?

The length of an elastic string is a metre when the longitudinal tension is \(4 \mathrm{~N}\) and \(\mathrm{b}\) metre when the longitudinal tension is \(5 \mathrm{~N}\). The length of the string in the metre when longitudinal tension is \(9 \mathrm{~N}\) is:

Steel ruptures when a shear of \(3.5 \times 10^{8} \mathrm{Nm}^{-2}\) is applied. The force needed to punch a \(1 \mathrm{~cm}\) diameter hole in a steel sheet \(0.3 \mathrm{~cm}\) thick is nearly:

Which of the following statement is false for the properties of electromagnetic waves?

In the figure given below, \(PQ\) represents a plane wavefront and \(AO\) and \(BP\) represent the corresponding extreme rays of monochromatic light of wavelength \(\lambda\). The value of angle \(\theta\) for which the ray \(BP\) and the reflected ray \(OP\) interfere constructively is given by:

What is Pascal’s Law?