Question # 1

Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

The number of neutron present in a nucleus in a given by

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N = A+Z

N = A- z

N = Z - A

N = A X Z

The output voltage of a rectifier is.

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Smooth

Pulsating

Alternating

Per featly direct

The building blocks of protons and neutrons are called.

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Ions

Electrons

Positrons

quarks

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

The mass spectrum of naturally occurring neon shows the most abundant isotope has atomic mass.

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19

20

21

22

Due to polarization, electric field E.

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Increase

Decrease

First increases then decreases

Remain same

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

Which particle has larger range in air.

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Alpha rays

Gama rays

Beta rays

Neutron

Doping is made comparatively larger in

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Emitter

Base

Collector

P -type semi conductor

The electrostatic force between two charges is 42 N, If we place a dielectric of E_y=2.1 between the charges then the force become equal to.

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42 N

88.2 N

20 N

2 N

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

Lorentz force means the force acting on a particle, which is

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Magnetic force only

Electric force only

Sum of electric and magnetic force

None of these

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt

Ampere second stands for the unit of.

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Charge

emf

energy

Power

Useful device to measure resistance, current and voltage is an electronic instrument called.

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Volt meter

Ammeter

Ohmmeter

Digital Multimeter

The middle region of electric field is:

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Maximum field spot

Zero field spot

Perpendicular field spot

All of above

Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

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