Question # 1

In CE amplifier phased reversal occurs when the output voltage is taken between

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Base and collector

Base and emitter

Collector and emitter

None of the terminals

Why is a capacitor resistor combination used in oscillators in grid circuit.

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To generate oscillation

To bias the grid automatically

To amplify oscillations

To sustain the oscillations.

The Beta particles move along.

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Straight path

Curved path

Zig Zag path

Circular path

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

The mass defect of Bohr's atomic model is

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Exclusion of nuclear motion

missing of classical and quantum theories

Failed to explain the fine structure of spectral line

All of the above

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

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234

235

236

238

What is the quantitative description of the effect of radiation on the living tissue.

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Radiation dosimetry

Radioactive dating

Telemetry

Dosage

The reciprocal of decay constant lamda of a radioactive substances is equal to.

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total life

Half life

Mean life

Curie

The unit Planck's constant is equivalent to that of.

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Energy

Force

Velocity

Angular momentum

The mass of an alpha particle is.

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2 u

4 u

6 u

8 u

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

Which of the following configuration of BJTs gives both voltage gain and current gain.

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common Base

Common Emtter

Common collector

All of the above

In a photocell, certain metals emit electrons for

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Visible light

X-rays

Infrared light

Ultraviolet light

When of the following radiations are not emitted by electron transitions in atoms.

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Visible rays

Ultraviolet rays

Infrared radiations

Alpha particles

The continuous x rays spectrum is obtained due to

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Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

The half life of a radioactive substance depend on.

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Pressure

Temperature

Amount of substance

No external influences

The unit generally used for measuring astronomical distances is.

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Parsecs

Light year

Metre

Kilometer

In order to reduce uncertainty in momentum one must use light of.

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Short wavelength

Large wavelength

Wavelength of intermediate value

Wavelength of any value

Which of the following can be used as an arrester in a nuclear reactor.

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Graphite

heavy water

Uranium

Cadmium

The absorption of X-rays in a given material follows.

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A parabola path

Is straight line

An exponential curve

A circle

In a Geiger Marsden experiment why do the great majority of the Alpha particles pass straight through the metal foil.

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Atomic nuclei may contain neutrons

Atoms are electrically neutral

Atoms are largely empty space

Atoms have positively charged nuclei

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