Question # 1

The SI unit of absorbed dose in.

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Bel

Weber

Rem

Grey

The input resistance of a JFET is of the order of.

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1 M Mega

10 M Mega

100 M Mega

1,000 M Mega

There are how many types of forces or interactions.

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Two

Three

Four

Five

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

A complete amplifier circuit made on a silicon chip and enclosed in a small capsule is

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Inductor

Metal detector

Diode

Operational amplifier

Radioactivity is the phenomenon associated with the.

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Transition of radiowaves

production of alpha particles only

Decay of nucleus

Reception of radio waves

Which temperature is required for the fusion of two nuclides.

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10⁶ K

10⁷K

10⁸K

10 ⁹ K

A transistor consists of.

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One p-n junction

Two p-n junctions

Three p-n junctions

Four p-n junction

The part of theory of relativity which deals with accelerated bodies is called.

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special theory of relativity

General theory of relativity

Lorentz's theory of relativity

Galilean theory of relativity

Which one of the following is a convenient energy unit to express the energy of sub atomic particles.

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Joule

electron volt

Watt

Curie

Which of the following is not an electromagnetic wave.

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game rays

Ultraviolet rays

Ultrasonic waves

Microwaves

The Rutherford atom according to classical theory is

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Stable

Unstable

Partially stable

Quantized

Half life and mean lifetime of a radioactive element are.

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Equal to each other

Inversely proportional to each other

Directly proportional to each other

Not related to each other

When a helium atom loses an electron it becomes.

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An a particle

A proton

A positive helium ion

A negative helium ion

The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.

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Directly proportional to n

Directly proportional to n2

Inversely proportional to n

Inversely proportional to n2

The ionization energy for hydrogen atom is

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-11.6 eV

-12.6 eV

-13.6 eV

-19.6 eV

An oscillator is basically an amplifier with loop gain

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Zero

Less than unity

More than unity

Infinity

One particle having zero mass and zero charge is.

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Positron

Electron

Neutrino

Neutron

Mosley's law establishes the X-rays fluorescence of target element with is.

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Atomic weight

Atomic number

Density

Lattice constant

Which of the following has the highest relative biological effectiveness or the quality factor.

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X rays and Gama rays

Electrons

Photons

Alpha particles

What are isotopes.

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Atoms of the same element with different numbers of neutrons.

Atoms of the same element with different numbers of protons.

Atoms which are radioactive

Atoms which have gained or lost an electron

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