Physics MCQs

Page No. 51

If a current carrying solenoid is suspended freely it will__________________?


abe rotating

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bcome to rest in N-S direction

✓


c vibrating like galvanometer needle

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dcomes to rest after rotation

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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

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bdirectly proportional to m

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cdirectly proportional to q

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ddirectly proportional to B

✓



A wheat stone bridge is said to be balanced when____________________?


amaximum current flows through the galvanometer branch

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bminimum current flows through the galvanometer branch

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cpotential difference across galvanometer branch is maximum

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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

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cmeasure voltage across a circuit

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dmeasure potential difference between two points in a circuit

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


aBINA cosa

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bBINA sina

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cBINA tana

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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

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c200 mA

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d 0.2 mA

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View Answer 2.0 mA

In a multi range ammeter as the range increases _____________________?


ashunt value decreases

✓


b shunt value increases

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cshunt value remains the same

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dnone of the above

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View Answer shunt value decreases

Which one of the following is not an electromechanical instrument ?


a galvanometer

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bvoltmeter

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cammeter

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dAC transformer and DC generator

✓



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


azero

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bequal to the restoring couple

✓


cgreater than the restoring couple

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dsmaller than the restoring couple

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


avoltmeter

✖


bgalvanometer

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ccathode ray oscilloscope (CRO)

✓


dammeter

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