HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

A body performing uniform circular motion has ______.

A circular loop is placed in a uniform magnetic field. The total number of magnetic field lines passing normally through the plane of the coil is called ______.

Why does a motorcyclist moving along a level curve at high speed have to lean more than a cyclist moving along the same curve at low speed?

A disc of mass 4 kg rolls on a horizontal surface. If its linear speed is 3 m/ s, what is its total kinetic energy?

Draw a neat labelled diagram of photo-current as a function of accelerating potential for fixed incident intensity but different incident frequencies for the same emitter material.

What is Gauss's law?

What is a Gaussian surface?

The electron in the hydrogen atom is moving with a speed at 2.3 x 10⁶ m/s in an orbit of radius 0.53Å. Calculate the magnetic moment of the revolving electron.

The threshold frequency for a certain metal for photoelectric effect is 1.7 x 10¹⁵ Hz. When a light of frequency 2.2 x 10¹⁵ Hz is incident on the metal surface, the kinetic energy of the emitted photoelectrons is 3.3 x.10^-19 J. Calculate Planck's constant.

Write a short note on Full wave rectifier.

Explain the formation of clouds at high altitude.

A voltmeter has a range of 0 - 20 V and a resistance of 500 Q. Explain how can be used to measure voltages from 0 - 200 volt?

Derive an expression for maximum speed moving along a horizontal circular track.

To convert a moving coil galvanometer into an ammeter we need to connect a ______.

In a photoelectric experiment, the stopping potential is 1.5V. What is the maximum kinetic energy of a photoelectron?

A horizontal force of 0.5 N is required to move a metal plate of area 10⁻² m² with a velocity of 3 × 10⁻²m/s, when it rests on 0.5 × 10⁻³ m thick layer of glycerin. Find the coefficient of viscosity of glycerin.

A spherical metal ball of radius 15 cm carries a charge of 2μC. Calculate the electric field at a distance of 20 cm from the center of the sphere.

The radius of a circular track is 200 m. Find the angle of banking of the track, if the maximum speed at which a car can be driven safely along it is 25 m/sec.

An alternating voltage is given by e = 8sin628.4t. Find

1. peak value of e.m.f.
2. frequency or e.m.f.
3. instantaneous value of e.m.f. at time t = 10. ms

The fundamental frequency of an air column in a pipe closed at one end is in unison with the third overtone of an open pipe. Calculate the ratio of lengths of their air columns