Physics MCQs

Page No. 49

Electromagnetic waves travel in free space with the speed of___________________?


aλ-rays


bPositive rays


cCathode rays


dMore than sound waves


View Answer λ-rays

An alternating current or voltage_____________________?


afluctuates off and on


bvaries in magnitude alone


cchanges its direction again and again


dchanges its magnitude harmonically and reverses its direction of flow after regularly recurring intervals



A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?


a 4 volt


b5 volt


c2 volt


d0.4 volt


View Answer 2 volt

Heating a magnet will ____________________?


aweaken it


bstrengthen it


creverse its polarity


ddemagnetize it completely


View Answer weaken it

Galvanometer is a very sensitive device with______________________?


avery low damping


bvery high damping


cno damping at all


dradial field disintegration


View Answer very low damping

When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?


aa straight line parallel to the field


b a parabola in a plane perpendicular to the field


ca circle in a plane perpendicular to the field


da straight line along its initial direction



The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?


a use a very long and fine suspension


buse a coil of very large area


cuse a coil with very large number of turns


duse a very strong magnetic field



An ammeter measures the total current flowing through a circuit when it is connected__________________?


a in series with the circuit


bin parallel with circuit


cin series with any of the parallel resistances in the circuit


d in parallel with any of the series resistances in the circuit



While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?


aa most sensitive galvanometer is used


b a steady voltage cell is used


cthe balance point is close to the middle of the wire


da high resistance box is used in one of its gap



Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?


a0.1 A


b1:00 AM


ccurrent sensitivity


d1 m A


View Answer current sensitivity

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