Question # 1

The 'x' in X-rays means

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Xenon

Explosion

x for unknown

X makes the spot

An increase in frequency above threshold frequency results in.

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Increase in photo electric current

Increase in K.E. of electrons

Decrease in photoelectric current

Decreases in K.E. of electrons

Marie Curie and Pierre Curie discovered two new radioactive elements which are.

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Uranium and radkum

Platinum and radium

Polonium and radium

Crypton and radon

Negative feedback

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Increases stability

Decreases stability

Produces oscillatory

Cannot occur

Choose the one which acts as single inverter.

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Common emitter

common collector

Common base

Diode

Binding energy per nucleon is.

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Greatest for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium weight nuclei

In which of the following controlled nuclear chain reaction is used to liberate energy.

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Nuclear bomb

Atomic bomb

Hydrogen bomb

Nuclear reactor

Bohr's atomic model assumes

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Nucleus is of infinite mass and is at rest

electron in a quantized orbit will not radiate energy

Mass of electron remains the same

All of the above

Which of the following radiations can penetrate 20 cm thick steel.

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Alpha particles

Beta particles

Gama particles

Neutrons

Induced fission result from the absorption of

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electron

Proton

Nucleon

Neutron

A factory buy 100 g of a radioactive chemical with a half life of 5 years which decays to a stable compound How much of the chemical will still be radioactive 10 years time.

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25 g

50 g

75 g

100 g

The strength of photo electric current depends upon.

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Intensity of incident light

Frequency of incident light

Angle of incident light

Distance between anode and cathode

Which configuration is used to connect high impedance source to a low impedance lead.

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CE

CB

CC

BE

Which particle has zero charge and zero rest mass.

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Neutron

Proton

Electron

Photon

Atomic reactor is based on

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Controlled chain reaction

Uncontrolledly chain reaction

Nuclear fission

Nuclear fusion

An operational amplifier have how many input terminals.

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One

Two

Three

Four

Low frequency response of an amplifier is mainly limited by.

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Biasing configuration

Coupling capacitor

By pass capacitor

Input impedance

The term used for the emission of electrons when light strikes a surface.

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The zeeman effect

The photo electric effect

Skin effect

Compton effect

White light a tungsten filament lamp is passed through sodium vapor and viewed through a diffraction gritting Which of the following best describes the spectrum which would be seen.

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Coloured lines on a black background

Coloured lines on a white background

Dark lines on a coloured background

Dark lines on a white background

Which type of radiation would be stopped completely by a thin piece of cardboard.

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Alpha particles

Beta particles

Gama rays

X -rays

As the mass number increases, the binding energy per nucleon in a nucleus

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Increases

Decreases

Remain constant

Varies in a way that depends upon A

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