general awareness physics for exam preparation

General Awareness About Physics

Introduction to Physics

Physics is often described as the study of  Matter and energy. It is concerned with how matter and energy related to each other, and how they affected each other over time and through space. Physics as the fundamental questions how did the universe begin? how and of what is it made? how does it change? what rules govern its behavior?

     Physics may be roughly divided into two camps: experimental physics and theoretical physics. Experimental physics designed and careful investigations on a broad range of phenomena in nature, often under conditions which are atypical of our everyday lives. They may, for example, investigate what happens to the electrical properties of materials at temperature very near absolute zero (460 degrees Fahrenheit) or measure the characteristics of energy emitted by very hot gases. theoretical physics propose and develop models and theories to explain mathematically the results of experimental observations.

Physics Basics 

System Of Units
MKS System	CGS System	FPS System	SI Units
(i)Length m  (meter)	Length cm  (centimeter)	Length ft  (foot)	It is an extended form of MKS system. It includes four more fundamental units(in addition to three basic units) which represent fundamental quantities in electricity, magnetism, heat and light.
(ii) Mass kg  (kilogram)	Mass g (gram)	Mass (pound)
(iii) Time s  (second)	Time s (second)	Time s (second)

Simple Conversion Table (Indian Units) Tolas to grams
Tolas	1	2	3	4	5	6	7	8	9	10
Grams	11.66	23.33	34.99	46.66	58.32	69.98	81.65	93.31	104.97	116.64

Conversion Formulas

Celsius to Fahrenheit  F= C * 1.8+32

Fahrenheit to Celsius  C= (F-32)*0.555

Inches (in) to cm= multiply by 2.54

Feet (ft) to meter = Multiply 0.3048

Miles (mi) to km = multiply by 1.6093