UNIZIK Physics 2008/2009 Day 2 Past Questions

Two radioactive elements A and B have half-lives of 100 and 50 years, respectively. Sample of A & B initially contain equal number of atoms. What is the ratio of the number of the remaining atoms of A to that of B after 200 years?

A boy standing some distance from the foot of a tall Cliff claps his hands and hear an echo 0.5s later. If the speed of sound is 340m/s, how far is he from the cliff?

Which of the following is not correct about isotopes of an element? They have

Which of the following is not an electromagnetic radiation?

Cloud formation is the direct result of

Water boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of the mountain the

The main reason why rice cooks faster in a pressure cooker than in a cooking pot is that

In which of the following media would sound waves travel faster?

Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules?

Each of the following physical quantities is classified as a vector or scalar quantity. Which of the classifications is correct?

The friction which exists between two layers of liquid in relative motion is called

Which of the following simple machines is a second class lever?

Which of the following types of motion does a body undergo when acted upon by a couple?

The frequency of a swinging pendulum is the

Which of the following quantities has the same units as energy ?