Physics Test - ...

The length and diameter of some samples of wires are given below, needed to be tested for the extent of the elongation. When the same tension is applied to each of the wires, which of the following will have the minimum elongation?

On closing an organ pipe suddenly at one end, it was observed that the frequency of the third harmonic of the closed pipe in increased by 300 Hz from the fundamental frequency of the first case. What is the fundamental frequency of the open pipe?

The second's pendulum of a clock is made up of copper. When it was calibrated, the temperature was 25^oC. In summer days, the temperature is increased by 10^oC. Calculate the time lost or gained by the clock in a week.

A cell with internal resistance r is connected to a resistive circuit with a load resistance 10 ohm. The maximum power delivered to the load resistance will be obtained if r is equal to

For two spheres of the same material and same radius, one being hollow and the other solid, which of the following statements is/are correct?

A person measures the time period of a simple pendulum inside a stationary lift and finds it to be T. If the lift starts accelerating upwards with an acceleration of g/3, then the time period of the pendulum will be

An EM wave detector is moving towards an EM wave emitting source. The source is emitting an electromagnetic microwave of frequency 10 GHz and the speed of the detector is 1.5 × 10⁸ m/s. What will be the frequency of the emitted wave measured by the detector?

Two monatomic ideal gases A and B having same volume are initially kept at same temperature and pressure. The volume of the gases and B are then compressed to half. If gas A is compressed isothermally and gas B compressed adiabatically, the relation between the final pressure of the gases P_a and P_b respectively will be

Two identical capacitors, having plate separation d0, are connected parallel to each other across a point 'A' as shown in the figure. Charge Q is imparted to the system by connecting a battery across the points 'A' and 'B', and then the battery is removed. If the first plate of the first capacitor and the second plate of the second capacitor started moving with constant velocity u0 towards the left, then find the magnitude of current flowing in the loop.

The resistance of a conducting wire at a temperature of 27oC is found to be 1. If the temperature coefficient of the wire is given to be (1.25 × 10^-3)°C^-1, at what temperature will the resistance of the wire be 2Ω?