MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

An ideal gas is expanded isothermally from volume V₁ to volume V₂ and then compressed adiabatically to original volume V₁. If the initial pressure is P₁, the final pressure is P₃ and net work done is W, then ____________.

Most excited states of an atom have life times of about ____________.

A series R-C circuit is connected to an alternating voltage source. Consider two situations:

(i) When capacitor is air filled.

(ii) When capacitor is mica filled.

Current through resistor is i and voltage across capacitor is V then:

An ideal gas is made to go from a state A to stale B in the given two different ways (see figure) (i) an isobaric and then an isochoric process and (ii) an isochoric and then an isobaric process. The work done by gas in the two processes are W₁ and W₂ respectively. Then,

One mole of an ideal gas with `gamma` = 1.4 is adiabatically compressed so that its temperature rises from 27° C to 47° C. The change in the internal energy of the gas is (R = 8.3 J/mol.K) ____________.

Figure show the circular coil carrying current I kept very close but not touching at a point A on a straight conductor carrying the same current l. The magnitude of magnetic induction at the centre of the circular coil will be.

In damped SHM, the SI unit of damping constant is ______.

Two identical samples of a gas are allowed to expand (i) isothermally (ii) adiabatically. Work done is ____________.

In which of the following processes, beat is neither absorbed nor released by a system?

A large number of liquid drops each of radius 'r' coalesce to form a big drop of radius 'R'. The energy released in the process in converted into kinetic energy of the big drop. The speed of the big drop is ______. (T = surface tension of liquid, p = density of liquid)

An ideal gas A and a real gas B have their volumes increased from V to 2V under isothermal conditions. The increase in internal energy ____________.

The frequency of an alternating current is 5O Hz. What is the minimum time taken by current to reach its peak value from rms value?

In a damped oscillatory motion, if 'T' is its time period and 'A' is its amplitude, then damping ______.

A block of mass 'M' is suspended from one end of a spring of force constant 'k'. The other end is rigidly attached to a horizontal platform. The mass oscillates vertically with a time period 'T'. If the mass gets detached from the spring, then the length of the spring will be shortened by (g = acceleration due to gravity).

A mass 'M' is suspended from a spring of negligible mass. The spring is pulled a little and then released so that the mass executes S.H.M. of period T. If the mass is increased by 'm', the time period becomes `("'5T'")/3`. What is the ratio `("M"/"m")`?

A current I = 10 sin (50 π t) ampere is passed in the first coil which induces a maximum e.m.f. of 5 π volt in the second coil. The mutual inductance between the coils is ______.

A circular coil of resistance 'R', area 'A', number of turns 'N' is rotated about its vertical diameter with angular speed 'ω' in a uniform magnetic field of induction 'B'. The average power dissipated in a complete cycle is ______.

A molecule of water on the surface experiences a net ______.

An alternating current of frequency 200 rad/s and peak value 1 A is applied to the primary of a transformer. If the coefficient of mutual induction between the primary and the secondary is 1.5H, then the voltage induced in the secondary will be approximately (π = 2217)

A coil of radius 'r' is placed on another coil (whose radius is 'R' and current flowing through it is changing) so that their centres coincide. (R>>r) if both the coils are coplanar then the mutual inductance between them is proportional to ______.