Physics MCQs

Page No. 51

If a current carrying solenoid is suspended freely it will__________________?


abe rotating


bcome to rest in N-S direction


c vibrating like galvanometer needle


dcomes to rest after rotation



A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?


aindependent mass m


bdirectly proportional to m


cdirectly proportional to q


ddirectly proportional to B



A wheat stone bridge is said to be balanced when____________________?


amaximum current flows through the galvanometer branch


bminimum current flows through the galvanometer branch


cpotential difference across galvanometer branch is maximum


dpotential difference across galvanometer branch is zero



A galvanometer basically is an instrument used to ____________________?


adetect current in a circuit


bmeasure current flowing through a circuit


cmeasure voltage across a circuit


dmeasure potential difference between two points in a circuit



Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?


aBINA cosa


bBINA sina


cBINA tana


dBINA


View Answer BINA

A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________?


a2.0 mA


b20 mA


c200 mA


d 0.2 mA


View Answer 2.0 mA

In a multi range ammeter as the range increases _____________________?


ashunt value decreases


b shunt value increases


cshunt value remains the same


dnone of the above


View Answer shunt value decreases

Which one of the following is not an electromechanical instrument ?


a galvanometer


bvoltmeter


cammeter


dAC transformer and DC generator



When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?


azero


bequal to the restoring couple


cgreater than the restoring couple


dsmaller than the restoring couple



n instrument which can measure potential without drawing any current is_____________________?


avoltmeter


bgalvanometer


ccathode ray oscilloscope (CRO)


dammeter



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