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

What should be tension applied to a wire of length 1 m and mass 10 gram, if it has to vibrate with fundamental frequency of 50 Hz?

Derive an expression for e.m.f. and current in terms of turns ratio

Represent Radioactive Decay curve using relation `N = N_o e^(-lambdat)` graphically

Define radius of gyration.

A transformer converts 240 V AC to 60 V AC. The secondary has 75 turns. The number of turns in primary are _______.

(A) 600

(B) 500

(C) 400

(D) 300

Calculate the internal energy at 298K for the formation of one mole of ammonia, if the enthalpy change at constant pressure is – 42.0 kJ mol^-1.

(Given: R = 8.314 J K^-1 mol^-1)

An alternative voltage given by V = 140 sin 314t is connected across a pure resistor of 50 Ω. Find

1. The frequency of the source.
2. The rms current is through the resistor.

What happens to a ferromagnetic substance heated above Curie temperature ?

The susceptibility of magnesium at 300 K is 1.2 x 10 ^-5 . What will be its susceptibility at 200 K.

Define binding energy and obtain an expression for binding energy of a satellite revolving in a circular orbit round the earth.

State Hooke’s law. Define the elastic limit and modulus of elasticity.

Assuming expression for impedance in a parallel resonant circuit, state the conditions for parallel resonance. Define resonant frequency and obtain an expression for it.

Explain refraction of light on the basis of wave theory. Hence prove the laws of refraction

Why is it useful to define the radius of gyration?

Discuss the necessity of radius of gyration. 

Answer in brief:

State the conditions under which the theorems of parallel axes and perpendicular axes are applicable. State the respective mathematical expressions.

If a = 0.72 and r = 0.24, then the value of t_r is ______.

Answer in brief:

What will happen to the mean square speed of the molecules of a gas if the temperature of the gas increases?

Answer in brief:

A gas in a cylinder is at pressure P. If the masses of all the molecules are made one-third of their original value and their speeds are doubled, then find the resultant pressure.