Question # 1

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

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Alpha particles

Beta particles

Gama particles

Neutrons

Why hydrogen atom does not emit x-rays.

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its size is very small

It contains only single electron

In it energy levels are for apart

In it energy levels are close to each other

Which of the following phenomenon is observed in obtaining an X ray photograph of our hand.

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Photoelectric effect

Zeeman effect

Shadow photography

Ionization

Which of the following causes the deflection of Alpha particles when they re passed through a thin foil.

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Attraction of nucleus

Collision with nuclei

Interactions with electrons

Electrostatic repulsion by the nucleus

The unit Planck's constant is equivalent to that of.

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Energy

Force

Velocity

Angular momentum

The total number nucleons in a nucleus are called.

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Mass number

Atomic number

Neutron number

Isotopes

Magnetic field does not cause deflection in

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Alpha particle

Beta minus particles

Beta plus particles

Gama rays

Ebers-Moll model describes the working of a

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BJT

FET

MOSFET

UJT

The tunnel effect makes possible

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Alpha decay

Gama rays

Positive Beta decay

negative Beta dacay

The most familiar example of radioactive dating is.

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Nitrogen dating

Carbon dating

Hydrogen dating

Helium dating

When a beta particle travels though a medium it knocks out electrons from the atoms due to.

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Gravitational force of attraction

Electrostatic force of repulsion

Nuclear force

Electromagnetic induction

The critical mass of fissionable uranium -235 can be reduced by

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Adding impurities to it

Heating the material

surrounding it by neutron reflecting material

Surrounding it by neutron absorbing material

When light of particular frequency is allowed to fall upon a metal surface electrons are emitted from a these emitted electrons are called.

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Photons

Holes

Quants

Photo electrons

Which of the following is not an electromagnetic wave.

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game rays

Ultraviolet rays

Ultrasonic waves

Microwaves

Low frequency response of an amplifier is mainly limited by.

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Biasing configuration

Coupling capacitor

By pass capacitor

Input impedance

Which of the following is formed by decay of a free neurton.

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A number of electrons

Two protons

A proton and an electron

An alpha particle

At high temperature a body generally emits redactions of.

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Small wavelengths

Long wavelengths

Moderates wavelengths

Zero wavelengths

Which of the following atom pair have the same structure.

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N, C

B, Li

H2 , Ne

Li , Na

The splitting of atomic energy levels and the associated spectrum lines when the atoms are placed in a magnetic field is called.

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The photoelectric effect

The zeeman effect

The Compton effect

Quantum effect

The ionization energy for hydrogen atom is

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-11.6 eV

-12.6 eV

-13.6 eV

-19.6 eV

When Be is bombarded by alpha particles, then we obtain

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electron

Proton

Positron

Neutron

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