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

In an npn transistor, the base current is 100 µA and the collector current is 10 mA. The emitter current is ______.

The resistances in left and right gap of a metrebridge are 20 `Omega` and 30 `Omega` respectively. When the resistance in the left gap is reduced to half its value, the balance point shifts by ______.

The magnetic field (B) inside a long solenoid having 'n', turns per unit length and carrying current 'I' when iron core is kept in it is (`mu_0` = permeability of vacuum, `chi` = magnetic susceptibility) ____________.

In the Wheatstone bridge, (shown in the figure) X = Y and A > B. The direction of the current between a and b will be ____________.

What is the e.m.f of the cell C in the circuit shown in figure, if the deflection in the galvanometer is zero, the resistance of the wire is 3 `Omega`, The length of the wire is 100 cm?

In an npn transistor, the collector current is 24 mA. If 80% of electrons reach collector, its base current in mA is ______.

The wave of the wavelength 30 cm and frequency 100 Hz will be ______.

If a lens is cut into two pieces perpendicular to the principal axis and only one part is used, the intensity of the image will be ____________.

When the value of R in the balanced Wheatstone bridge, shown in the figure, is increased from 5 `Omega` to 7 `Omega`, the value of s has to be increased by 3 `Omega` in order to maintain the balance. What is the initial value of S?

ln switching circuit, transistor is in ON state and values of I_C and I_B are 4.2 mA and 5 µA respectively and R_C= l k`Omega` and R_B= 300 k`Omega`. If V_BE = 0.5 V, find the value of V_BB.

Wavefront is the locus of all points, where the particles of the medium vibrate with the same ____________.

In a transistor in CE configuration, the ratio of power gain to voltage gain is ____________.

A particle is given an initial speed u inside a smooth spherical shell of radius R = 1 m so that it is just able to complete the circle. Acceleration of the particle when it is in vertical circle is ____________.

A magnet of magnetic moment 6 Am² weighs 65 g. The density of the material of the magnet is 6500 kg/m³. What is the magnetization?

Consider a particle of mass m suspended by a string at the equator. Let R and M denote radius and mass of the earth. If ω is the angular velocity of rotation of the earth about its own axis, then the tension on the string will be (cos 0° = 1).

A light string passing over a smooth light pulley connects two block of masses m₁ and m₂ (vertically). If the acceleration of the system is (3g/7), then the ratio of masses is ____________.

In switching circuit, transistor is in ON state, values of I_E and l_B are 10 mA and 0.8 mA respectively and R_L is 2 k`Omega`. If V_CE is 7.6 V, then V_CC is ____________.

Which of the following regions of a transistors are, respectively, heavily dopped and lightly dopped?

A magnetizing field of 5000 A/m produces a magnetic flux of 4 x 10^-5 Wb in an iron rod of cross-sectional area 0.4 cm². The permeability of the rod in Wb/A-m, is ______.

In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be: ____________.