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

The angle of contact at the interface of water glass is 0°, ethyl alcohol-glass is 0°, mercury-glass is 140° and methyl iodide-glass is 30°. A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in trough is ____________.

A cyclic process ABCD P is shown in the figure P-V diagram. Which of the following curve represent the same process?

The initial pressure and volume of a gas is 'P' and 'V' respectively. First by isothermal process gas is expanded to volume '9V' and then by adiabatic process its volume is compressed to 'V' then its final pressure is ______. (Ratio of specific heat at constant pressure to constant volume = `3/2`).

If a gas is compressed isothermally then the r.m.s. velocity of the molecules ______.

If 'ΔQ' is the amount of heat supplied to 'n' moles of a diatomic gas at constant pressure, 'Δ U' is the change in internal energy and 'Δ W' is the work done, then Δ W : Δ U : Δ Q is ______.

An ideal gas at 27°C is compressed adiabatically to (8/27) of its original volume. If ratio of specific heats, y = 5/3 then the rise in temperature of the gas is ______.

A glass plate is partly dipped vertically in the mercury and the angle of contact is measured. If the plate is inclined, then the angle of contact will ____________.

A dielectric is inserted between the plates of a charged and isolated parallel-plate air capacitor. Then, the charge on the plates and the potential difference, respectively, ______.

Capacity of a parallel plate capacitor with a medium of dielectric constant 8 is 12 µF. If the medium is removed, then capacity of the capacitor would be ____________.

A water barrel stands on a table of height 'h'. A small hole is made on the wall of barrel at its bottom. If the stream of water coming out of the hole strikes the ground at horizontal distance 'R' from the table, the depth 'd' of water in the barrel is ______.

A capacitor of unknown capacitance is connected across a battery of 'V' volt. The charge stored in it is 'Q' coulomb. When the potential across the capacitor is reduced by 'V' volt, the charge stored in it becomes Q' coulomb. The potential V is ______ 

A parallel plate capacitor has a uniform electric field `overset(->)("E")` in the space between the plates. If the distance between plates is 'd' and the area of each plate is 'A', the energy stored in the capacitor is ______ 

(ε₀ = permittivity of free space)

Four capacitors of equal capacity have an equivalent capacitance C₁ when connected in series and an equivalent capacitance C₂ when connected in parallel. The ratio `c_2/c_1`, is ______

A rectangular block of mass 'm' and cross-sectional area 'A' floats on a liquid of density ρ. If it is given a small vertical displacement from equilibrium, it starts oscillating with frequency 'n' equal to ______.

(g = acceleration due to gravity)

A monoatomic gas at pressure P and volume V is suddenly compressed to one eights of its original volume. The final pressure at constant entropy will be ______.

For an ideal gas graph is shown for three processes. Process 1, 2 and 3 are respectively.

With the increase in temperature, the angle of contact ______.

A prism has a refracting angle of 60°. When placed in the position of minimum deviation, it produces a deviation of 30°. The angle of incidence is ______.

AU-tube is of non uniform cross-section. The area of cross-sections of two sides of tube are A and 2A (see fig.). It contains non-viscous liquid of mass m. The liquid is displaced slightly and free to oscillate. Its time period of oscillations is ______.

A parallel plate air capacity 'C' farad, potential 'V' volt and energy 'E' joule. When the gap between the plates is completely filled with dielectric ______.