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

A square frame ABCD is formed by four identical rods each of mass 'm' and length 'ℓ'. This frame is in X-Y plane such that side AB coincides with X-axis and side AD along Y-axis. The moment of inertia of the frame about X-axis is ______.

In Young's double-slit experiment, the intensity at a point where the path difference is `lambda/4` is l. If the maximum intensity is l₀, and then the ratio of `l_0/l` is ______.

`(cos45^circ = 1/sqrt2 = sin45^circ)`

When two coherent monochromatic light beams of intensities I and 4I are superimposed, then what are the maximum and minimum possible intensities in the resulting beams?

Find the value of θ in the given figure.

In a common emitter amplifier, the input resistance is 1000 Ω, the peak value of Input signal voltage is 5 mV, and β = 60. The peak value of output current is

A transistor has a voltage gain A. If the amount βA of its output is applied to the input of the transistor, then the transistor becomes oscillator, when ______.

Two waves having the same amplitude and frequency overlap near a point. The ratio of the intensities when the two waves arrive in phase to that when they arrive 90° out of phase is ______ 

A common emitter amplifier is designed with n-p-n transistor (α = 0.99). The input impedance is 1 kΩ and the load is 10 kΩ. The voltage gain will be ______

The condition to convert an amplified signal into an oscillating signal is ______

If in a p-n junction diode, a square input signal of 10 V is applied as shown Then the output signal across R_L will be ______

A transistor having α = 0.8 is connected in common emitter configuration. When the base current changes by 6 mA, then the change in collector current is ______.

The momentum of a photon of energy 1 MeV in kg m/s will be ______

The de Broglie wavelength associated with photon is, ____________.

If l₁, l₂, l₃ are the lengths of the emitter, base and collector of a transistor, then ____________.

If the radius of the innermost Bohr orbit is 0.53 Å, the radius of the 4^th orbit is ______

For a transistor, the current ratio 'β_dc' is defined as the ratio of ______.

In the symbol for a transistor, the arrow head points in the direction of the ____________. 

Three charges +Q, q, +Q are placed respectively, at distance, 0, d/2 and d from the origin, on the X-axis. If the net force experienced by +Q, placed at x = 0, is zero then value of q is ____________.

Least doped region in a transistor ____________.

What is the ratio of the charges of two conducting spheres of radii r₁ and r₂ which have equal surface charge density?