HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Physics

What is a heat engine?

Mention any two elements of a heat engine.

One beat means that the intensity of sound should be ______.

The effective capacitor between A and B in the following circuit is ______.

Explain the theory of an AC circuit with a resistor. 

Explain the mechanism of a refrigerator with the help of a schematic diagram.

The coefficient of performance of a room air conditioner is 3. If the rate of doing work is 2 kW, the heat current is ______.

Which physical quantity of an atomic electron has the dimensions same as that of h?

Where is the power dissipated in an alternating current circuit?

Draw a neat labelled diagram of Ferry’s perfectly black body.

Define emissive power and coefficient of emmision of a body.

A metal sphere cools at the rate of 4°C / min. when its temperature is 50°C. Find its rate of cooling at 45°C if the temperature of surroundings is 25°C.

The resolving power of a telescope depends upon the ______.

Two copper spheres of radii 6 cm and 12 cm respectively are suspended in an evacuated enclosure. Each of them are at a temperature 15°C above the surroundings. The ratio of their rate of loss of heat is.................

1. 2:1
2. 1:4
3. 1:8
4. 8:1

Discuss the composition of two S.H.M.s along the same path having same period. Find the resultant amplitude and intial phase.

Discuss the composition of two S.H.M.s along the same path having same period. Find the resultant amplitude and intial phase.

The dimensions of emissive power are ______.

A pinhole is made in a hollow sphere of radius 5 cm whose inner wall is at temperature 727^oC. Find the power radiated per unit area. [Stefan’s constant σ = 5.7 x 10^-8 J/m² s K4 , emissivity (e) = 0.2]

Compute the temperature at which the r.m.s. speed of nitrogen molecules is 832 m/s. [Universal gas constant, R = 8320 J/k mole K, molecular weight of nitrogen = 28.]

If numerical aperture of a microscope is increased, then its ______.