Question # 1

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

The existence of positron in 1928 was predicted by

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Anderson

Dirac

Chadwick

Plank

The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.

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Band spectrum

Line spectrum

Continuous spectrum

Absorption spectrum

The condition for the wheatstone bridge to be balanced is given by

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None of above

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

Binding energy per nucleus for uranium is above:

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6.7 Mev

7.7 Mev

6.9 MeV

7.9 MeV

Both xenon and caesium each have:

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41 isotopes

36 isotopes

43 isotopes

33 isotopes

The toner of printer is given

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Positive charge

Negative charge

Neutral

First positive then negative

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

Transistor was invented by:

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Bardeen

Micheal faraday

Lenz

Newton

Which one of the following resistance is used to convert a Galvanometer into an ammeter.

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High resistance

Low resistance in series with galvanometer

Shunt

High resistance in series with galvanometer

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

The series in infrared region is:

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Paschen series

Bracket series

Pfund series

All of above

The sensitivity of galvanometer directly depends upon

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Magnetic field

Area of coil

Both a and b

None of a, b, c

The most abundant isotope of neon is:

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Neon 21

Neon 20

Neon 22

None of above

The vessel containing the tow electrodes and liquid to known as.

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Chemical cell

Volt cell

Volta cell

Volta meter

If a charged body is moved against the electric field it will gain.

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P.E.

K.E.

Mechanical energy

Electrical potential energy

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

Bremsstrahlung radiation are examples of

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Atomic spectra

Molecular spectra

Continuous spectra

Discrete spectra

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

If the following particle have the same energy, which particle has the shortest wave length.

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alpha particle

Neutron

Beta particle

Proton

Concept of the electric field lines is introduced by

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Coulomb

Faraday

Einstein

Joseph henry

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