HSC Science (General) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions

A paramagnetic gas has 2.0 × 10²⁶ atoms/m with atomic magnetic dipole moment of 1.5 × 10⁻²³ A m² each. The gas is at 27°C.

1. Find the maximum magnetization intensity of this sample.
2. If the gas in this problem is kept in a uniform magnetic field of 3 T, is it possible to achieve saturation magnetization? Why?

The susceptibility of a paramagnetic material is χ at 27° C. At what temperature its susceptibility be χ/3?

The susceptibility of a paramagnetic material is χ at 27° C. At what temperature its susceptibility be χ/3?

A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 10 A in 0.2 s, what is the change of flux linkage with the other coil?

An emf of 96.0 mV is induced in the windings of a coil when the current in a nearby coil is increasing at the rate of 1.20 A/s. What is the mutual inductance (M) of the two coils?

A long solenoid of length l, cross-sectional area A and having N₁ turns (primary coil), has a small coil of N₂ turns (secondary coil) wound about its center. Determine the Mutual inductance (M) of the two coils.

What will be the energy of each photon in monochromatic light of frequency 5 ×10¹⁴Hz?

What are primary and secondary sources of light?

What is wavefront? How is it related to rays of light? What is the shape of the wavefront at a point far away from the source of light?

Derive the laws of reflection of light using Huygens’ principle.

Determine the series limit of Balmer, Paschen, and Pfund series, given the limit for Lyman series is 912 Å.

Explain what is meant by polarization and derive Malus’ law.

In a BJT, the largest current flow occurs ______.

Why is the base of a transistor made thin and is lightly doped?

Answer in brief:

A charge q is moved from a point A above a dipole of dipole moment p to a point B below the dipole in an equatorial plane without acceleration. Find the work done in this process.

Why are the emitter, the base, and the collector of a BJT doped differently?

The common-base DC current gain of a transistor is 0.967. If the emitter current is 10mA. What is the value of base current?

In a common-base connection, a certain transistor has an emitter current of 10mA and a collector current of 9.8 mA. Calculate the value of the base current.

In a common-base connection, the emitter current is 6.28 mA and the collector current is 6.20 mA. Determine the common-base DC current gain.

A mixture of fuel and oxygen is burned in a constant-volume chamber surrounded by a water bath. It was noticed that the temperature of water is increased during the process. Treating the mixture of fuel and oxygen as the system,

1. Has heat been transferred?
2. Has work been done?
3. What is the sign of ∆U?