Waec Physics 2007 Past Questions and Answers

Question 46:

• WAEC 2007

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 47:

• WAEC 2007

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 48:

• WAEC 2007

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 49:

• WAEC 2007

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 50:

• WAEC 2007

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\(^{-2}\)]