Question # 1

Intensity of field inside a hollow charged sphere will be.

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Negative

Unaffected

Zero

Maximum

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

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K.E of al the emited electrons

Mean K.E of emited electrons

Maximum K.E of emited electrons

Minimum K.E of emited electrons

If 1 x 10⁷ electrons passes through a conductor in 1.0 micro second , then the current is.

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2 A

1.6 A

2.6 x 10^-6 A

1.6 x 10^-6 A

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

The magnetic force is simply a

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Reflecting force

Deflecting force

Restoring force

Gravitational force

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

Electric power:

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Vx1

V²x1

V/1

V/1²

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

The reactance is the ratio of

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V_rms/I_rms

V_rms x I_rms

I_rms/V_rms

V_max x V_rms

The mass of proton in amu is:

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1.07276

1.7276

1.007276

1.0007276

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