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

In an AC circuit, e and i are given by e = 150 sin(150t)V and i = 150 sin `(150t + π/3)` A. The power dissipated in the circuit is ______.

An electric lamp is connected in series with a capacitor and an AC source is glowing with a certain brightness. How does the brightness of the lamp change on increasing the capacitance?

Choose the correct option.

In which of the following systems will the radius of the first orbit of the electron be smallest?

If the number of nuclei in a radioactive sample at a given time is N, what will be the number at the end of two half-lives?

Answer in brief.

A big dumb-bell is prepared by using a uniform rod of mass 60 g and length 20 cm. Two identical solid spheres of mass 25 g and radius 10 cm each are at the two ends of the rod. Calculate the moment of inertia of the dumb-bell when rotated about an axis passing through its centre and perpendicular to the length.

Why two or more mercury drops form a single drop when brought in contact with each other?

The pressure of water inside a closed pipe is 3 × 10⁵ N/m². This pressure reduces to 2 × 10⁵ N/m² on opening the valve of the pipe. Calculate the speed of water flowing through the pipe. [Density of water = 1000 kg/m³].

How much work is required to form a bubble of 2 cm radius from the soap solution having surface tension 0.07 N/m?

A rectangular wireframe of size 2 cm x 2 cm, is dipped in a soap solution and taken out. A soap film is formed, if the size of the film is changed to 3 cm x 3 cm, Calculate the work done in the process. The surface tension of the soap film is 3 x 10^-2 N/m.

Define the Excitation energy of an electron in an atom.

Define the Binding energy of an electron in an atom.

Define ionization energy of an electron in an atom.

Starting from the formula for the energy of an electron in the nth orbit of the hydrogen atom, derive the formula for the wavelengths of Lyman and Balmer series spectral lines and determine the shortest wavelengths of lines in both these series.

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The radius of the 4^th orbit of the electron will be smaller than its 8^th orbit by a factor of ______.

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In the spectrum of the hydrogen atom which transition will yield the longest wavelength?

Which of the following properties of a nucleus does not depend on its mass number?

Unit of the coefficient of viscosity is ______ 

Two capillary tubes of radii 0.6 cm and 0.3 cm are dipped in the same liquid. The ratio of heights through which the liquid will rise in the tubes is ______.

The average energy per molecule is proportional to ______