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

Two identical sounds A and B reach a point in the same phase. The resultant sound is C. The loudness of C is n dB higher than the loudness of A. The value of n is ______.

The frequency of the output signal becomes ____________ times by doubling the value of the capacitance in the LC oscillator circuit.

The oscillation in L.C. circuit is produced due to ____________.

Consider a solenoid carrying supplied by a source with a constant emf containing iron core inside it. When the core is pulled out of the solenoid, the change in current will ______.

Which of the substances P, Q, or R has the lowest specific heat? The temperature v/s time graph is shown ______.

Electrical oscillations of desired frequency can be obtained by ______.

An e.m.f. of 10 volt is produced by a self inductance when the current changes at a steady rate from 6 A to 4 A in 1 millisecond. The value of self inductance is ____________.

Two long conductors, separated by a distance 80 cm carry current I₁ and I₂ in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to 1.8 m. The new value of the force between them is ____________.

The magnetic field energy in an inductor changes from maximum value to minimum value in 10 ms, when connected to an a.c. source. The frequency of the source is ______.

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is ____________.

The molar specific heats of an ideal gas at constant pressure and constant volume are denoted by C_p and C_v respectively. If `gamma = "C"_"p"/"C"_"v"` and R is the universal gas constant, then Cp is equal to ______.

A monoatomic gas of pressure 'P' having volume 'V' expands isothermally to a volume '2V' and then adiabatically to a volume '16V'. The final pressure of the gas is ______.
(ratio of specific heats = `5/3`)

The value of 'γ' for a gas is given as `gamma = 1 + 2/"f"`, where 'f ' is the number of degrees of freedom of freedom of a molecule of a gas. What is the ratio of `gamma_"monoatonic"//gamma_"diatomic"`?
Diatomic gas consists of rigid gas molecules

Heat is applied to a rigid diatomic gas at constant pressure. The ratio ΔQ : ΔU : ΔW is ______.

At same temperature and pressure of an ideal gas, ____________.

Two long and straight conductors, placed parallel to each other are separated by 20 cm. carrying current of 3A and 5A respectively in opposite direction. The force per unit length exerted by each conductor on the other is (µ₀ = 4π x 10^-7 Wb/Am)

A toroidal solenoid with air core has an average radius 'R', number of turns 'N' and area of cross-section 'A'. The self-inductance of the solenoid is (Neglect the field variation cross-section of the toroid)

Two coils of wire A and B are placed mutually perpendicular as shown. When current is changed in any one coil.

Two long parallel wires, separated by a distance R have equal current I flowing in each of them. The magnetic field of one exerts a force F on the other. The distance R is increased to 4R and the current in each wire is reduced from I to I/4. What is the force between them now?

For a gas `"R"/"C"_"v" = 0.4,` where 'R' is the universal gas constant and 'C_v' is molar specific heat at constant volume. The gas is made up of molecules which are ______.