Physics Past Questions and Answers

The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called

A Critical energy
B Ionization energy
C Work function
D Planck's constant

Question 1562:

Which of the following particles are termed nucleons in a neutral atom?

A Protons and neutrons
B Neutrons and electrons
C Protons and electrons
D Protons, electrons and neutrons

Question 1563:

Which of the following statements about the use of radioisotopes is not correct? They are used to

A Induce mutations in plants and animals to obtain new and improved varieties
B Trace the paths of metabolic processes in plants and animals
C Estmate the age of rocks
D Locate broken bones

Question 1564:

Which of the following phenomena supports the theory that waves have a particle nature?

A Electron diffraction
B Photoelectric effect
C Diffraction of light
D X-ray interference

Question 1565:

A block of wood of mass 5kg is pulled on a platform by a force of 40N as illustrated in the diagram above. If the frictional force, F experienced by the block is 12N, calculate the magnitude of the acceleration of the acceleration of the block

A 2.4ms^-2
B 5.6ms^-2
C 8.0ms^-2
D 2.4ms^-2