Question # 1

The 'x' in X-rays means

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Xenon

Explosion

x for unknown

X makes the spot

Specially designed solid state detector can be used to detect.

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Alpha particles

Beta particles

Gama rays

X- rays

The half life of a given radioactive isotope is 10 years The original mass of the isotope is 12 g What mass of this isotope remains un decayed after 20 years.

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0.5 g

1.2 g

3.0 g

6.0 g

What will be excitation energy in the third orbit of hydrogen atom.

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0.66 eV

0.85 eV

1.5 eV

5.4 eV

The maximum K.E. with which photoelectrons are emitted depends very strongly on the.

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Intensity of incident light

Electric field near the photocathode

Frequency of incident light

Polarization of incident light

Induced fission result from the absorption of

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electron

Proton

Nucleon

Neutron

What do we study by crystallography.

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The analysis of X ray spectra of elements and study of crystal structure.

Visible spectra of sources and crystal study

Ultraviolet spectra of sources and crystal study

Characteristics of X-rays

Which of the following is invariant under Galilean transformation.

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Velocity

Impulse

Momentum

Distance

The phenomenon in which a photon of frequency 'f' is scattered by an electron and the scattered photon has frequency f <f is known as.

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Pair production

Pair annihilations

Photoelectric effect

Compton's effect

The constant lamda is called the.

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Decay constant

Gas constant

Planck's constant

Dose constant

The critical mass of a fission reaction is.

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The mass to start a nuclear fission reaction

The minimum mass for chain reaction

The size of the reactor core

The size of fuel plus the size of moderator

Which quantity remains fixed in isobars.

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Mass number

Atomic number

Number of neutrons

Number of protons

the wavelength of continuous X-rays is inversely proportional to.

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Intensity of incident electron beam

Temperature of the target

Intensity of X-rays

The energy of electrons striking the target

Which uranium isotope having the atomic weights as given below is easily fissionable.

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234

235

236

238

Which experiment confirmed the de Broglie hypothesis.

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Double slit experiment

Division germier experiment

Schrodinger's Cat experment

Bohr's experiment

Which of the following wavelength lies in X-rays region.

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1 A

100 A

1,000 A

10,000 A

The Inner electrons in heavy atoms can be disturbed and dislodged by.

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X rays

Alpha particle

Beta particles

gama particles

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 path of Gama rays in Wilson cloud chamber is

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Irregular

Dense and straight

Thin and continuous

Thin and discontinuous

Transistors with various combinations are widely used as switches in.

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electric generators

Rectificers

Amplifiers

Computers

Which six particles and their antiparticles interact by the weak interaction.

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Leptons

Hadrons

Muons

pi mesons

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