MEASUREMENT/UNIT
Total Questions: 52
In the,there are seven fundamental physical quantities (which are measured in base or fundamental units):length,mass,time,electric current,temperature,luminous intensity and amount of a substance.
In the physics, power is the rate of doing work or of transferring heat or electrical energy i.e the amount of energy transferred or converted per unit time. Power(p)=work(w)/Time(t) The SI unit of power is watt, which is equal to joule per second.Power is always represented in watt(W) or Kilowatt(KW)
Electrical power is the rate ,per unit time ,at which electrical energy is transferred by an electrical circuit.The SI unit of electrical power is watt.Ampere is the unit of electric current,volt is the unit of electric potential and coulomb is the unit of electric charge in the SI system
The SI unit of is Newton or kg.m/sec² Force =mass*acceleration In physics ,something that cause a change in the motion of of object is called force.The modern definition of force (an object's mass multiplied by its acceleration ) was given by Issac Newton in his laws of motion.
When a force acts to move a object ,then work done by the force is equivalent to the product of force and displacement in the direction of force .It is scalar quantity. The SI unit of work is Newton meter, which is also called as joule.Joule is also the unit of energy.
The hertz is the (symbol :Hz) is the derived unit of frequency in the international system of units ( SI system) and is defined as one cycle per second.
The SI unit of electrical resistivity is ohm-meter(Ωm).It is commonly represented by the- Greek word p(rho) defined as p=RA/L Where R= Resistance of material l=length of the material A=Cross section of the material p=resistivity as per option
Unit of radioactivity is defined as the activity of a quantity of radioactive material where one decay takes place per second.The SI unit of the radioactivity is Becquerel (Bq) and this term is named after Henri Becquerel .
