Physics MCQs

Page No. 49

Electromagnetic waves travel in free space with the speed of___________________?


aλ-rays

✓


bPositive rays

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cCathode rays

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dMore than sound waves

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View Answer λ-rays

An alternating current or voltage_____________________?


afluctuates off and on

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bvaries in magnitude alone

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cchanges its direction again and again

✓


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

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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

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b5 volt

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c2 volt

✓


d0.4 volt

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View Answer 2 volt

Heating a magnet will ____________________?


aweaken it

✓


bstrengthen it

✖


creverse its polarity

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ddemagnetize it completely

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View Answer weaken it

Galvanometer is a very sensitive device with______________________?


avery low damping

✓


bvery high damping

✖


cno damping at all

✖


dradial field disintegration

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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

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b a parabola in a plane perpendicular to the field

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ca circle in a plane perpendicular to the field

✓


da straight line along its initial direction

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


a use a very long and fine suspension

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buse a coil of very large area

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cuse a coil with very large number of turns

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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

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cin series with any of the parallel resistances in the circuit

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

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


aa most sensitive galvanometer is used

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b a steady voltage cell is used

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cthe balance point is close to the middle of the wire

✓


da high resistance box is used in one of its gap

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


a0.1 A

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b1:00 AM

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ccurrent sensitivity

✓


d1 m A

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View Answer current sensitivity

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