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

For an isothermal expansion of a perfect gas, the value of `(Delta "P")/"P"` is equal to ____________.

A force of 5 N, making an angle `theta` with the horizontal, acting on an object displaces it by 0.8 m along the horizontal direction. If the object gains kinetic energy of 1 J, the horizontal component of the force is ____________.

In an isothermal process, the volume of an ideal gas is halved. One can say that ____________.

Assertion: Equal volumes of monatomic and polyatomic gases are adiabatically compressed separately to equal compression ratio `("P"_2/"P"_1)`. Then monatomic gas will have greater final volume.

Reason: Among ideal gases, molecules of a monatomic gas have the smallest number of degrees of freedom.

Two different wire loops are concentric and lie in the same plane. The current in the outer loop (I) is clockwise and increases with time. The induced current in the inner loop.

An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas?

The activity of a radioactive sample ____________.

We consider a thermodynamic system. If `Delta"U"` represents the increase in its internal energy and W the work done by the system, which of the following statements is true?

Ideal gas for which 'ϒ' = 1.5 is suddenly compressed to `1/4`th of its initial volume. The ratio of 4 the final pressure to the initial pressure is ______.

 `(ϒ = "C"_"p"/"C"_"v")`

A water drop of radius R' splits into 'n' smaller drops, each of radius 'r'. The work done in the process is ______.

T = surface tension of water

Alternating current of peak value `(2/pi)` ampere flows through the primary coil of transformer. The coefficient of mutual inductance between primary and secondary coil is 1 H. The peak e.m.f. induced in secondary coil is ______. (Frequency of a.c. = 50 Hz)

The mutual inductance between two coplanar concentric rings A and B of radii 'R₁' and 'R₂' placed in air when a current 'I' flows through ring A is (R₁ >> R₂) (µ₀ = permeability of free space) ____________.

A radioactive substance has half life of 3 hours. 75 % of the substance would decay in ____________.

The work done on the system in changing the state of a gas adiabatically from equilibrium state A to equilibrium state B is 22.4 J. If the gas is taken from state A to B through another process in which the net heat absorbed by the system is 15.5 cal, then the net work done by the system in the latter case is ______.

( l cal = 4.2 J)

Two coils P and Q have mutual inductance 'M' H. If the current in the primary is I = I₀ sin `omega`t, then the maximum vlaue of e.m.f. indued in coil Q is ____________.

The mutual inductance between two coils is 0.09 henry. If the current in the primary coil changes from 0 to 20 A in 0.006 s, the e.m.f. induced in the secondary coil at that instant is ____________.

The upward force of 105 dyne due to surface tension is balanced by the force due to the weight of the water column and 'h' is the height of water in the capillary. The inner circumference of the capillary is ______.

(surface tension of water = 7 × 10^-2 N/m)

Under isothermal conditions, two soap bubbles of radii 'r₁' and 'r₂' coalesce to form a big drop. The radius of the big drop is ______.

Soap solution is used for cleaning dirty clothes because ______.

The coefficient of mutual inductance is 2H and induced e.m.f. across secondary is 2 kV. Current in the primary is reduced from 6 A and 3A. The time required for the change of current is ____________.