Physics Past Questions and Answers

The direction of the magnetic field at a point in the vicinity of a bar magnet is

A Always towards the north pole of the magnet
B Always away from the south pole of the magnet
C Along the line joining the point to the neutral point
D In the direction the north pole of a compass needle would point

Question 457:

When two parallel wires carry currents in opposite directions, the force on either wire is

A Away from the other wire
B Zero, because the currents cancel each other
C Twice as much as when the currents are in the same direction
D Towards the other wire

Question 458:

A galvanometer of resistance 20\(\Omega\) is to be provided with a shunt that \(\frac{1}{10}\) of the whole current in a circuit passes through the galvanometer. The resistance of the shunt is

A 2.00\(\Omega\)
B 2.22\(\Omega\)
C 18.00\(\Omega\)
D 18.22\(\Omega\)

Question 459:

What type of reaction is represented by the following scheme? \( ^2 _1X \) + \( ^{2} _{1}Y \) + \( ^{3} _{2}Z \) + \( ^{1} _{0}n \) + energy

A Fusion reaction
B Fission reaction
C Chain reaction
D Radioactive decay

Question 460:

Which of the following statements is TRUE of photoelectric effect?

A It cannot occur in liquids
B The energy of the emitted electrons is independent of the work function of the surface
C The energy of the emitted electron depends on the wavelength of the incident light
D The greater the intensity of the incuident light, the greater the incident of the emitted electron