Question # 1

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

The potential barrier for silicon is.

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0.7 V

0.5 V

0.3 V

0.9 V

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

the force between two charge is 28 N. If paraffin wax of relative permittivity 2.8 is introduced between the charges as medium, then the force reduces to.

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25 N

20 N

10 N

15 N

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

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 peak to peak value of alternating voltage is

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2V_o

V_o

None of these

The number of electrons in one coulomb charge is equal to

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6.2 x 10¹⁸ electrons

Zero electrons

1.6 x 10^-22 electrons

6.2 x 10²¹ electrons

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

Number of Isotopes of Neon gas are

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2

3

4

1

The conductor experience force, placed in magnetic above:

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Move towards weaker part of field

Move towards stronger part of field

Remains at rest

Move upwards in space

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

The resistivity of two wires isρ₁ andρ₂ which are connected in series. If there dimentions are same then the equivalent resistivity of the combination will be:

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(ρ₁ +ρ₂)

1/ρ₁+ 1/ρ₂

ρ₁+ρ₂/2

ρ_1/ρ₂

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

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