HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Physics

The ratio of emissive power of perfect blackbody at 1327°C and 527°C is ______.

State applications of eddy currents.

Answer in brief.

What is the natural frequency of the LC circuit? What is the reactance of this circuit at this frequency?

Answer in brief.

What is the natural frequency of the LC circuit? What is the reactance of this circuit at this frequency?

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.

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 ______