Question # 1

Though the wavelength of X-rays is smaller than that of visible light yet the speed of X-rays in vacuum is.

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longer that that of visible light

Smaller than that of visible light

Same as that of visible light

Unpredictable

Tracer techniques make use of.

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Neutron scattering

Electron beams

LASER

Radioactive isotopes

Neutrino9 is a particle with

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Charge less property and has no spin

Charge less property and has spin

Charge less like electron and has spin

The same property as neutron

Positron are produced during.

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Annihilation

ionization

Pair production

x rays production

Current gain of a CE amplifier is 50, ITS hfe is about

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25

50

75

100

According to Max. Planck, energy is released or absorbed in discrete packets called.

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quanta

Meson

Energy shells

Position

X-rays are not used in RADARs because

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They are not reflected by the target

they are not completely absorbed by air

They damage the target

They are reflected by the target

Cosmic rays mostly comprise of

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Neutral particles

Negative charged particles

Positively charged particles

Ions

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 working of cloud chamber is based in the presence of.

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Super heated vapours

Liquid

Super saturated vapors

Unsaturated vapours

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

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CE

CB

CC

BE

The half life of isotopes X is four days and its initial mass is 32 mg What mass of the isotope X will remain after twelve days.

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2 mg

4 mg

8 mg

18 mg

The best shield against Gama rays would be of

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Heavy water

Aluminium

Iron

Lead

One becquerel is equal to

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Decay of orie radioactive atoms per second

Decay of 10 radioactive atoms per secnd

Decay of 100 radioactive atoms per second

Decay of infinity radioactive atoms per second.

The electrons behave as wave because.

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They can be diffracted by a crystal

They can be defecting by magnetic field

They can be deflecting by electric field

they can produce ions in gases

In Compton's effect the change in wavelength of a scattered photon is called.

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Angle of emergence

Angle of refraction

Angle of deviation

Compton shift

In an electronic transition atom cannot emit

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Gama rays

Visible rays

Infrared rays

Ultraviolet rays

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

Which of the following is invariant under Galilean transformation.

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Velocity

Impulse

Momentum

Distance

Which of the following is believed to be carrier o nuclear forces.

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Lepton

Meson

Bason

Baryon

The back ground radiation in the atmosphere on the average is

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0.5 Sv per year

1.0 Sv per year

1.5 Sv per year

2.0 Sv per year

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