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

Find the work done when a drop of mercury of radius 2 mm breaks into 8 equal droplets. [Surface tension of mercury = 0.4855 J/m²].

Explain the failure of wave theory of light to account for the observations from experiments on photoelectric effect.

The kinetic energy and angular momentum of a body rotating with constant angular velocity are E and L. What does `(2E)/L` represent?

Define photoelectric work function of a metal.

What is banking of a road? 

Why it is necessary banking of a road?

State sign convention of Kirchhoff's voltage law.

Give Einstein's explanation of the photoelectric effect.

A 2-m long thin and straight metal wire carries a positive charge of 3 µ C. (a) What is the linear charge density on the wire? (b) Hence, find the electric intensity at a point 1.5 m away from the centre of the wire.

Express Faraday-Lenz's law of electromagnetic induction in an equation form.

A conductor in the form of a circular arc of the radius of curvature R subtends an angle Ø at its centre of curvature. If the current in the conduct is I, the magnetic induction at the centre of curvature is ______.

What is the ripple factor?

A curved road 5 m wide is to be designed with a radius of curvature 900 m. What should be the elevation of the outer edge of the road above the inner edge optimum speed of the vehicles rounding the curve is 30 m/s.

The centripetal acceleration of the bob of a conical pendulum is, in the usual notation, ______.

Explain in brief the basic construction of a moving-coil table galvanometer whit a neat labelled diagram.

A cyclist is undertaking horizontal circles inside a cylindrical well of radius 5 m. If the friction coefficient is 0.5, what should be the minimum speed of the cyclist?

Calculate (i) the pressure due to the weight of the water at a depth of 2.5 m and (ii) the depth below the surface of water at which the pressure due to the weight of the water equals 1.0 atm.

If the frequency of the input voltage 50 Hz is applied to a full wave rectifier, what will be the output frequency?

The angular displacement of a particle in 6 sec on a circle with angular velocity `pi/3` rad/sec is ______.

The surface tension of boiling water is ______.