Question # 1

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

Mass of meason is

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Greater then proton

Less than proton

Equal to proton

Equal to neutron

Improper bisting of a transistor circiut produces:

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Heavy loading of emitter current

Distortion in the output output signal

Excessive heat at collector terminal

Faculty location of load line

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

Weber is the unit of

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Magnetic flux

Permeability

magnetic force

None of above

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

Recentaly a complex crystalline structure known as yttrium barium copper oxide (Yba₂Cu₃O₃) have reported to become super conductor at

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163 K

169 K

200 K

100 K

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

μ_∘(Ampere's constant) has value.

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4πx10^-7 WbA^-1m^-1

4πx10^-17 Wbm²

4πx10⁷ WbA^-1m^-1

4πx10-27 Wb/m²

A diode characteristics curve is a plot between

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Current and resistance

Voltage and time

Voltage and current

Current and time

The natural frequency of L.C circuit is equal to

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Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

What is difference is isotopes

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Number of protons

Number of neutrons

Number of electrons

Charge number

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

A galvanometer is an electrical instrument used to

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Measure resistance

Measure voltage

Detect passage of current

None of these

The potential difference between the top and bottom of a cloud chamber is of the order of

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290 v

400 v

1 kv

None of above

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

Magnetic flux density is measured in

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Weber

Weber/m2

Tesla -m

Gauss

Which one of the following is correct

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All of above

Which one is photo conductor.

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Copper

Selenium

Mercury

Aluminium

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