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

The dimensional formula of surface tension is ______.

Define centripetal force.

What are surroundings in thermodynamics?

The energy of the free surface of a liquid drop is 5π times the surface tension of the liquid. Find the diameter of the drop in C.G.S. system.

Explain analytically how the stationary waves are formed

Hence show that the distance between node and adjacent antinode is λ/4

Derive Laplace’s law for spherical membrane of bubble due to surface tension.

The combined resistance of a galvanometer of resistance 500Ω and its shunt is 21Ω. Calculate the value of shunt.

The combined resistance of a galvanometer of resistance 500Ω and its shunt is 21Ω. Calculate the value of shunt.

A conductor of any shape, having area 40 cm² placed in air is uniformly charged with a charge 0* 2µC. Determine the electric intensity at a point just outside its surface. Also, find the mechanical force per unit area of the charged conductor.

[∈₀=8.85x10^-12 S.I. units]

A particle in S.H.M. has a period of 2 seconds and amplitude of 10 cm. Calculate the acceleration when it is at 4 cm from its positive extreme position.

The surface tension of water at 0°C is 75.5 dyne/cm. Calculate surface tension of water at 25°C.

(α for water = 2.7×10^-3/°C)

Derive an expression for excess pressure inside a drop of liquid.

If the frequency of incident light falling on a photosensitive material is doubled, then the kinetic energy of the emitted photoelectron will be ______.

A circular coil of 300 turns and average area 5 * 10^-3m² carries a current of 15A. Calculate the magnitude of magnetic moment associated with the coil.

Angle of contact for the pair of pure water with clean glass is _______.

The equation of a progressive wave is y = 7 sin (4t - 0.02x), where x and y are in cms and time t in seconds. The maximum velocity of a particle is _______.

The fundamental frequency of transverse vibration of a stretched string of radius r is proportional to _______.

A raindrop of diameter 4 mm is about to fall on the ground. Calculate the pressure inside the raindrop. [Surface tension of water T = 0.072 N/m, atmospheric pressure = 1.013 x 10⁵ N/m² ]

Draw a neat labelled diagram showing forces acting on the meniscus of water in a capillary tube.