Question # 1

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

The electric intensity due to two oppositely charged plates is

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None of these

The induction can be increased by winding the wire around a core made of.

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Copper

Silicon

Iron

Aluminum

Induced emf in A.C. generator can be increased by

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Decreasing area of coil

Decreasing magnetic field

Increasing area of coil

Slowing down speed of coil

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

If a low resistance is connected parallel to a galvanometer then galvanometer is converted.

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Ammeter

Voltammeter

Ohmmeter

Multimeter

Curie temperature is

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Differen for chromium oxide and cobalt

Same for chromium oxide and cobalt

Same for iron and cobalt

None of these

The magnetic force is simply a

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Reflecting force

Deflecting force

Restoring force

Gravitational force

Marie Curie and Pierre Curie discovered.

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Uranium

Uranium and Radium

Polonium and radium

Radium

Presence of dielectric always.

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Increase the electrostatic force

Reduces the electrostatic force

Do not effect electrostatic force

Doubles the electrostatic force

In Series resonance circuit the impedance of circuit art resonance frequency, is

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Maximum

Minimum

It is unequal to R

None of above

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

The electric flux through closed surface depends upon

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Charge

Medium

Geometry

Charge and Medium

Which one has the least resistance.

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Galvanometer

Ammeter

Ohm meter

Volta meter

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

The e/m of a neutron is

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Less than electron

The same as electron

Zero

Greater than election

The unit of magnetic induction B is

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Coulomb

Ampere

Coulomb/ampere

Weber/m²

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