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

When the number of turns in a coil is tripled without any change in the length of the coil, its self-inductance ______

In the following figures, the diodes are either forward biased or reversed biased. Choose the CORRECT statement:

The coefficient of self-inductance of a solenoid is 0.20 mH. If a core of soft iron of relative permeability 900 is inserted, then the coefficient of self-inductance will become nearly ______

If 'C_p' and 'C_v' are molar specific heats of an ideal gas at constant pressure and volume respectively. If 'λ' is the ratio of two specific heats and 'R' is universal gas constant then 'C_p' is equal to ______.

The quantity which does not vary periodically for a particle performing SHM is ______.

50 g of copper is heated to increase its temperature by 10° C. If the same quantity of heat is given to 5 g water, the rise in its temperature is [Specific heat of copper = 420 joule-kg^-1 °C^-1 , specific heat of water = 4200 joule-kg^-I °C^-1]

Which of the following substances (A, B and C) has the highest specific beat?

Two uniform brass rods A and B of length land 2l and radii 2r and r respectively are heated to the same temperature. The ratio of the increase in the volume ofB to that of A is ____________.

If same current 'I' is flowing through two parallel wires, separated by the distance 'b' in air, then force acting per unit length of wires will be `(mu_0= "permeability of free space")`____________.

The magnetic potential energy stored in a certain inductor is 15 mJ, when the current in the inductor is 40 mA. This inductor is of inductance ____________.

When a capacitor connected with coil is completely discharged, then ____________.

The reading of the ammeter for a silicon diode in the given circuit is:

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 ______.

In case of p-n junction diode, the width of depletion region is ______.

The frequency of oscillation of a particle of mass m suspended at the end of a vertical spring having a spring constant k is directly proportional to ____________.

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 ______.

Consider the junction diode as ideal. The value of current flowing through AB is ______.

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