Physics Past Questions and Answers

The correct sequence of energy transformation in the operation of an x-ray tube is i. X-rays ii. Kinetic energy of thermo electrons iii. Potential energy of the target atoms iv. Heat energy of the emitted electrons

A Iv, iii, ii, i
B Ii, iv, iii, i
C Iv, ii, iii, i
D Iii, iv, ii, i

Question 1192:

There is always an uncertainty involved in any attempt to measure the position and momentum of an electron simultaneously. This statement is known as the

A De Broglie's law
B Heisenberg uncertainty principle
C Franck-Hertz experimental law
D Wave-particle paradox

Question 1193:

The diagram above illustrates three forces acting on an object at point O. If the object is in equilibrium, determine the magnitude of the force P.

A 10.5N
B 11.0N
C 17.3N
D 20.0N

Question 1194:

Calculate the effective resistance between P and Q in the diagram above

A 0.75\(\Omega\)
B 4.00\(\Omega\)
C 5.00\(\Omega\)
D 7.00\(\Omega\)

Question 1195:

A particle is projected at an angle of 30° to the horizontal with a speed of 250 ms\(^{-1}\). Calculate the;
(a) total time of flight of the particle;
(b) speed of the particle at its maximum height. [ g = 10 ms\(^{-2}\)]