Question # 1

The mass of an helium nucleus is equal to.

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2.0015 u

3.0015 u

4.0015 u

5.0015 u

What are isotopes.

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Atoms of the same element with different numbers of neutrons.

Atoms of the same element with different numbers of protons.

Atoms which are radioactive

Atoms which have gained or lost an electron

As the mass number varies, which of the quantities does not change w.r.t nucleus.

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Mass

Volume

Binding energy

Density

X-rays spectrum may be

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Continuous spectrum

Discontinuous spectrum

Line spectrum

Continuous and line spectrum

How many terminals does a BJT have.

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1

2

3

4

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

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

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quanta

Meson

Energy shells

Position

Bohr's atomic model assumes

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Nucleus is of infinite mass and is at rest

electron in a quantized orbit will not radiate energy

Mass of electron remains the same

All of the above

From which radiation it is most difficult to protect oneslelf.

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Alpha radiation

Beta radiation

Gama radiation

Heat radiation

The continuous x rays spectrum is obtained due to

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Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

Lissajou's figures are used in a Cathode Ray Oscilloscope while measuring.

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Time period

Frequency

Voltage gain

phase angle

The constant lamda is called the.

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Decay constant

Gas constant

Planck's constant

Dose constant

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

At high temperature a body generally emits redactions of.

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Small wavelengths

Long wavelengths

Moderates wavelengths

Zero wavelengths

The output of two input OR gate is zero only when its.

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Either input is one

Either input is zero

Both inputs are zero

Both inputs are one

The part of theory of relativity which deals with accelerated bodies is called.

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special theory of relativity

General theory of relativity

Lorentz's theory of relativity

Galilean theory of relativity

The usefulness of X rays is largely due to their

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Mass

Density

Volume

Penetrating power

Which one among these contacts in a transistor is non rectifying.

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Base

Emitter

Collector

None of these

X-rays are absorbed maximum by

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Paper

Copper

Steel

Lead

Which of the following atom pair have the same structure.

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N, C

B, Li

H2 , Ne

Li , Na

The value of open loop gain for the amplifier is

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zero

very low

very high

of an intermediate vaue

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

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Graphite

heavy water

Uranium

Cadmium

Which one of the following has maximum frequency.

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Visible light

Gama rays

Ultraviolet rays

Infrared rays

Which is the famous standard model of the universe.

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the big bang

Casmos

Astronaut

The small stap

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