first law of physics

Time: 70 min. Max. Marks: 60 1. Which of the following does not depend on temperature? (1) half life period (2) rate constant (3) number of activated molecules (4)..

Resistors are classified as linear and nonlinear. A linear resistor is one which obeys a law discovered experimentally in case of metallic conductors, by a German physicist, George Simon Ohm in 1828. According to Ohm's law, "The electric current through a conducto..

The gas laws explain the physical behaviour of gases, and seek to establish a relationship among the factors that influence this behaviour. Factors that cause variation in the properties of gases are : 1. Pressure of Gas : It is the ratio of the force the gas exe..

Usually a metallic conductor has a constant value for its resistance 'R' when other physical conditions remain the same. That is, in such metallic cpnductors the current (i) passing through conductor will be directly proportional to the potential difference (V) applied across its e..

If a bar magnet is suspended in crossed 4 magnetic fields then it comes to rest with its axis along the direction of the resultant of the two fields. Suppose that a magnetic compass needle is pivoted so that it is free to rotate in a horizontal plane about a vertical axis passin..

Rutherford and Soddy. found that the rate at which a particular radioactive material disintegrates is independent of the physical or chemical conditions. It depends upon the number of radioactive atoms present at that instant. The law states that, "the rate of radioactive..

In 1913, British physicist H.J.G. Moseley generated characteristic X-rays for as many as 38 elements by using them as targets for electron bombardment in discharge tube of his own design. He noted that if, for a given spectral line say K a , the square root of the frequency is plotted agains..

">Consider a gas enclosed in a cylinder fitted with a frictionless and non-conducting piston. Let the walls of the cylinder except the bottom be thermally insulated. Let the gas be supplied an amount 8Q of heat. This heat energy shall cause (i) an increase in the temperature of the gas (ii) an upwa..

The law of moments states that the algebraic sum of the moments of any two forces about any point in their plane is equal to the moment of their resultant about the same point. This law is applicable to concurrent forces as well as parallel forces. Applying the ..

The law states that when a completely plane polarised light beam is incident on a polarising sheet the intensity of light transmitted through the analyser varies as the square of the cosine of the angle between the plane of transmission of the analyser and the plane of the pol..