HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Important Questions for Physics

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

Which one of the following particles cannot be accelerated by a cyclotron?

(A) Electrons

(B) Protons

(C) Deuterons

(D) α- particles

State Ampere’s circuital law.

Obtain an expression for magnetic induction along the axis of the toroid.

State the importance of Davisson and Germer experiment.

Draw a neat labelled diagram of a schematic of the experimental setup for the photoelectric effect. 

With the help of a circuit diagram describing an experiment to study the photoelectric effect.

The energy of a photon is 2 eV. Find its frequency and wavelength.  

The work function of a surface is 3.1 eV. A photon of frequency 1 × 10¹⁵ Hz. Is an incident on it. Calculate the incident wavelength is photoelectric emission occurs or not.   

An iron rod of the area of cross-section 0.1m² is subjected to a magnetizing field of 1000 A/m. Calculate the magnetic permeability of the iron rod. [Magnetic susceptibility of iron = 59.9, magnetic permeability of vacuum = 4π x 10^-7 S. I. unit]  

State the law of radioactive decay.

Distinguish between diamagnetic and paramagnetic substances.

Answer in brief.

State the postulates of Bohr’s atomic model.

A magnet of magnetic moment 3Am² weighs 75 g. The density of the material of the magnet is 7500 kg/m³. what is magnetization? 

What is magnetic susceptibility?

Define half-life period.

State SI unit of Magnetization.

Derive an expression for ratio of e.m.f.s and currents in terms of number of turns in primary and secondary coil.

In a series LCR circuit, the phase difference between the voltage and the current is 45°. Then the power factor will be ______.

An LED emits visible light when it’s ______.