Physics Test - ...

The average degree of freedom per molecule of a gas is 6. The gas performs 25 J work, while expanding at constant pressure. The heat absorbed by the gas is:-

All wires have same resistance and equivalent resistance between A and B is R. Now keys are closed, then the equivalent resistance will become:-

A point charge +Q is positioned at the centre of the base of a square pyramid as shown. The flux through one of the four identical upper faces of the pyramid is:-

The radioactive sources A and B have half lives of 2hr and 4hr respectively, initially contain the same number of radioactive atoms. At the end of 2 hours, their rates of distintegration are in the ratio:-

A metal wire PQ slides on parallel metallic rails having separation 0.25 m, each having negligible resistance. There is a 2Ω resistor and 10V battery as shown in figure. There is a uniform magnetic field directed into the plane of the paper of magnitude 0.5 T. A force of 0.5N to the left is required to keep the wire PQ moving with constant speed to the right. With what speed is the wire PQ moving? (Neglect self-inductance of the loop)

A charge particle q of mass m₀ is projected along the y-axis at t = 0 from origin with a velocity V₀. If a uniform electric field E₀ also exists along the x-axis, then the time at which the de-Broglie wavelength of the particle becomes half of the initial value is:

In the given figure a ring of mass m is kept on a horizontal surface while a body of equal mass 'm' attached through a string, which is wounded on the ring. When the system is released the ring rolls without slipping. Consider the following statements and choose the correct option.

(i) acceleration of the centre of mass of ring $is\frac{g}{3}$
(ii) acceleration of the hanging particle is $\frac{2g}{3}$
(iii) frictional force (on the ring) acts along forward direction
(iv) frictional force (on the ring) acts along backward direction

A carrier wave has power of 1675 kW. If the side band power of a modulated wave subjected to 60%. Then find the amplitude modulation level

A telescope has an objective of focal length 60 cm and eyepiece of focal length 7 cm. The least distance of distinct vision is 35 cm. The telescope is focused for distinct vision on a scale 240 cm away from the objective. Find the produced magnification

In given P-V diagram, if the temperature of Point B is 25^oC, then find the ratio of temperature at point C and E.