Question # 1

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

The total number nucleons in a nucleus are called.

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Mass number

Atomic number

Neutron number

Isotopes

An oscillator is basically an amplifier with loop gain

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Zero

Less than unity

More than unity

Infinity

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

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Leptons

Hadrons

Muons

pi mesons

Tracer techniques make use of.

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Neutron scattering

Electron beams

LASER

Radioactive isotopes

Which one of the following has the largest wavelength.

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x rays

Infrared rays

Visible light

Radio waves

An operational amplifier have how many input terminals.

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One

Two

Three

Four

The average energy released per fission of U is about

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200 eV

2 keV

2 MeV

200 MeV

The relationship between mass number atomic number and neutron number is.

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A = Z + N

A = Z - N

Z = A + N

N = Z - A

The binary equivalent of 25 is

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111001

11001

1001

10101

The critical mass of a fissionable material is.

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1 kg

10 kg

100 kg

1.,000 kg

The energy in an electromagnetic wave is carried in the units called.

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Protons

Electrons

Neutrons

Nucleus

One radian is equal to.

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0.1 Gy

0.01 Gy

0.001 Gy

0.0001 gy

How many terminals does a BJT have.

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1

2

3

4

The capture of neutron by a proton results in the formation of.

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Deuteron and gama rays

Deuteron and alpha particle

Triton and Beta particles

Tritron and X rays

A photon is chasing an electron, whose speed is 0.9 c What is their relative speed.

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0.1 C

C

0.8 C

0.9 C

Ashes from a campfire deep in a cave show carbon -14 activity of only one eighth the activity of fresh wood. How long ago was that campfire made.

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13590 years

15190 years

17190 years

21190 years

Emitter follower amplifier is an example of.

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Current series feedback

Voltage series feedback

Current shunt feed back

Voltage shunt feedback

Which one of the following is a neutron absorber

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Pb

Cd

Cu

Ag

Which both elements are good for nuclear fission.

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Thorium an uranium

Thorium and radium

Plutonium and uranium

Plutonium and throrium

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

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