HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Important Questions

State the advantages of potentiometer over voltmeter.

Define potential gradient of the potentiometer wire.

How is potential gradient measured? Explain.

Distinguish between a potentiometer and a voltmeter.

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

Four resistances 6Ω, 6Ω, 6Ω and 18Ω form a Wheatstone bridge. Find the resistance which connected across the 18Ω resistance will balance the network.

Explain with a neat circuit diagram. How you will determine the unknown resistances using a meter bridge.

A cell of e.m.f 1.5V and negligible internal resistance is connected in series with a potential meter of length 10 m and the total resistance of 20 Ω. What resistance should be introduced in the resistance box such that the potential drop across the potentiometer is one microvolt per cm of the wire?  

State any two characteristics of a series LCR AC resonance circuit.

Find the current in a circuit consisting of a coil and a capacitor in series with an A.C source of 110V (r.m.s.), 60Hz. The inductance of a coil is 0.80 H and its resistance is 50Ω. The capacitance of a capacitor is 8µF. 

A radio can tune over the frequency range of a portion of the MW broadcast band (800kHz -1200kHz). If its LC circuit has an effective inductance of 200mH, what must be the range of its variable condenser? 

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.