The resistance of a resistor is reduced to half of its initial value. In doing so, if other parameters of the circuit remain unchanged, the heating effects in the resistor will become
(A) two times
(B) half
(C) one - fourth
(D) four times

The resistance of a conductor is reduced to half its initial value. In doing so the heating effects in the conductor will become

If earth radius reduces to half of its present value then the time period of rotation will become:

The effective resistance of two resistors in parallel is (12)/(7) Omega . If one of the resistors is disconnected the resistance becomes 4 Omega . The resistance of the other resistor is

In one half- life time duration activity of a sample reduced to half of its initial value. total number of nuclei present are reduced to half of its initial value. number of radioactive nuclei present is reduced to half of its initial value mass of sample is reduced to half of its initial value Out of these, correct statements are

The concentration of a substance undergoing a chemical reaction becomes one-half of its original value after time t regardless of the initial concentration. The reaction is an example of a -

If diameter of earth becomes half of its present value and its mass becomes four times its present value, how would the weight of any object on the surface of earth be affected ?