HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions

In a series LR circuit X_L = R and power factor of the circuit is P₁. When capacitor with capacitance C such that X_L = X_C is put in series, the power factor becomes P₂. Calculate P₁/P₂.

Derive an expression for the impedance of an LCR circuit connected to an AC power supply. Draw phasor diagram.

Derive an expression for the impedance of an LCR circuit connected to an AC power supply. Draw phasor diagram.

A 10 μF capacitor is charged to a 25 volt of potential. The battery is disconnected and a pure 100 m H coil is connected across the capacitor so that LC oscillations are set up. Calculate the maximum current in the coil.

A 10 μF capacitor is charged to a 25 volt of potential. The battery is disconnected and a pure 100 m H coil is connected across the capacitor so that LC oscillations are set up. Calculate the maximum current in the coil.

The second law of thermodynamics deals with transfer of ______.

Describe Rayleigh's criterion for resolution. Explain it for a telescope and a microscope.

Answer in brief.

The total impedance of a circuit decreases when a capacitor is added in series with L and R. Explain why?

Answer in brief.

The total impedance of a circuit decreases when a capacitor is added in series with L and R. Explain why?

Calculate the value of the capacity in picofarad, which will make 101.4 microhenry inductance to oscillate with a frequency of one megahertz.

Calculate the value of the capacity in picofarad, which will make 101.4 microhenry inductance to oscillate with a frequency of one megahertz.

1000 calories of radiant heat are incident on a body. If the body absorbs 400 calories of heat, find the coefficient of emission of the body. 

The second law of thermodynamics deals with the transfer of ______.

Describe Young’s double-slit experiment with a neat diagram showing points of maximum and minimum intensity. 

In which of the following devices, the eddy current is not used ______ 

Why and where are eddy currents are undesirable? How are they minimized? 

A charged 10 microfarad capacitor is connected to an 81 mH inductor. What is the angular frequency of free oscillations of the circuit?  

A charged 10 microfarad capacitor is connected to an 81 mH inductor. What is the angular frequency of free oscillations of the circuit?  

A radio can tune over the frequency range of a portion of the MW broadcast band (800kHz -1200kHz). If its LC circuit has an effective inductance of 200mH, what must be the range of its variable condenser? 

A radio can tune over the frequency range of a portion of the MW broadcast band (800kHz -1200kHz). If its LC circuit has an effective inductance of 200mH, what must be the range of its variable condenser?