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

Calculate the work done in blowing a soap bubble to a radius of 1 cm. The surface tension of soap solution is 2.5 × 10⁻² N/m.

The mutual inductance of a pair of adjacent coils is 1.5 H. If the current is one coil changes from 5 A to 10 A in 0.1 s, the rate of change of magnet flux linkage is ______.

If T₁, T₂ and T₃ are the forces due to surface tension at the liquid-s solid-gas and liquid-gas interfaces such that T₂ - T₁ ≅ T₃ and the contact angle for the liquid-solid pair is θ then ______.

Draw neat labelled diagrams for the first and second overtones of vibration of an air column in a pipe open at both ends.

A rectangular coil of wire 50 turn each of area 6 x 10^-4 m² is freely suspended in a field of 3 x 10^-2 Wb / m². Calculate the current flowing through the coil when it deflects through 60°, when torsional constant is 3.82 x 10^-6 SI unit.

Define binding energy per nucleon.

State the significance of binding energy per nucleon.

Which of the following quantities is a measure of stability of nucleus?

Spring constant is a dimensional constant. Justify.

State and define the SI unit of mutual inductance.

Compare rates of loss of heat by the body at temperature 527°C and 127°C. Temperature of surrounding is 27°C.

Prove that, equivalent S.I. unit of surface tension is J/m².

How is the magnetic field of a small current loop identical to that of a short magnetic dipole? Explain.

Two coils having self inductances L₁ = 75 mH and L₂ = 55 mH are coupled with each other. The coefficient of coupling (K) is 0. 75. Calculate the mutual inductance (M) of the two coils

State and explain Stefan's law of radiation.

Define Boltzmann constant.

Calculate the amount of energy evolved when 343 droplets of mercury each of radius. 0.05 mm, combine to form one drop. The surface tension of mercury is 50 x 10^-2 N/m.

Calculate the values of x and y in the following nuclear reaction.

\[\ce{^227_89Ac -> ^211_82Pb + x[^4_2He]+ y[^0_-1e]}\]

What is binding energy of nucleus?

What is binding energy of a hydrogen atom?