HSC Science (Computer Science) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions

Eight droplets of water each of radius 0.2 mm coalesce into a single drop. Find the decrease in the surface area.

What is a rectifier?

When radiation of wavelength λ is used to illuminate a metallic surface, the stopping potential is V. When the same surface is illuminated with radiation of wavelength 3λ, the stopping potential is `"V"/4`. If the threshold wavelength for the metallic surface is nλ. then value of n will be ______.

If the maximum kinetic energy of emitted electrons in the photoelectric effect is 2eV, the stopping potential will be ______.

If friction is made zero for a road, can a vehicle move safely on this road?

Write the mathematical formula for Bohr magneton for an electron revolving in n^th orbit.

Find the magnitude of the electric field just above the middle of a large, flat, horizontal metal sheet carrying a charge density of 90 nC/m².

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?

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, ______.