Question # 1

One gray is equal to.

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1 J-1 kg -1

1 J -1 kg -2

1 J 1 -g-1

1 j kg -2

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

Alpha particles are

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Helium nuclei

sodium nuclei

Ioized nuclei

Hydrogen nuclei

The continuous x rays spectrum is obtained due to

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Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

Cobalt -60 is a radioactive element with half life of 5.25 years. What fraction of the original sample will be left after 26 years.

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1/4

1/8

1/16

1/32

The unit of Rydberg constant R is

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m

m3

m^-1

m-2

For the normal operation of transistor the emitter base junction is always.

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Zero biased

Reverse biased

Forward bised

Both a and b

NOR gate is a combination of.

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OR gate and NOT gate

OR gate and AND gate

OR gate and OR gate

NOT gate and AND gate

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 animal did Erwin Schrodinger contemplate using in his famous thought experiment.

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mouse

Cat

Dog

Rabbit

The process of energy generation in sun and stars is.

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Fusion of heavy nuclei

fusion of light nuclei

Fission of light nuclei

Solar panels

The molecular weight of D2O is

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16

18

20

24

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

A freshly made sample of radioactive material gives a count rate of 8,000 counts per minute After twenty days it gives a count rate of 500 counts per minute What is the half life of the materials.

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5 days

10 days

40 days

20 days

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

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25

50

75

100

The radius of second orbit of hydrogen atom is

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0.071 A

0.142 A

4.752 A

9.5298 A

Lines of Balmer series are emitted by hydrogen atom when the electron jumps from

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The first orbit to any other orbit

Higher orbits to second orbit

Higher orbits to first orbit

The third orbit to higher orbit

X-rays are good for imagining

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Tendons

Brain

Bones

Heart

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

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X rays

Alpha particle

Beta particles

gama particles

Alpha particles emitted from a radioactive material are.

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He nucliei

H -nucliei

Li nucliei

B nucliei

The photons emitted in inner shell transition are.

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Alpha particle

Beta particle

Gama particle

Characteristic X-rays

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