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

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 ______.

The work done in blowing a soap bubble of radius R is W. The work done in blowing a bubble of radius 2R of the same soap solution 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 ____________.

According to de-Broglie hypothesis, the wavelength associated with moving electron of mass 'm' is 'λ_e'· Using mass energy relation and Planck's quantum theory, the wavelength associated with photon is  'λ_p'. If the energy (E) of electron and photon is same then relation between 'λ_e' and 'λ_p' is ______.

In the study of transistor as an amplifier, the ratio of collector current to emitter current is 0.98 then the ratio of collector current to base current will be ______.

In switching circuit, transistor is in ON state. Values of I_C and I_B are 5.2 mA and 10 µA respectively and value of R_C is 1 k`Omega`. If V_cc is at 5.5 V, then V_CE is ______.

V_e, V_b, and V_e are emitter, base, and collector voltage respectively for npn transistor in CE mode. Amplifier works for the combination of biasing voltage equal to ______.

An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is ( c being velocity of light) ______.

Two-point charges of + 0.2 µµC and -0.2 µµC are separated by 1 o8 m. What is the value of the electric field at an axial point at a distance of 0.1 m from their mid-point?