Question # 1

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

Coulomb multiplied by volt by volt gives the unit called:

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farad

Ohm

Second

joule

Watt

An electron of the hydrogen atom in the second orbit is called its:

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Ground state

Excited state

Ionized state

Any of these

None of these

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

None of these

The first shell near the neucles is

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L-shell

X-shell

N-shell

M-shell

Tick the series which lie/s in. the infra-red region.

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Pfund series

Brackett series

Paschen series

All of these

None of these

The lasing or active medium in He-Ne laser discharge tube is:

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Nitrogen

Helium

Hydrogen

Neon

None of these

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

None of these

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

Graph of Black body radiation is example of

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Band spectra

Continuo's spectra

Line spectra

All

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

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Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

Photons must have energy equal to

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ev

En

hf

None of these

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

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one

two

three

four

five

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

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Short wavelength

Large wavelength

Very large wavelenth

Low frequency

Both (B) and (C)

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

Balmer series was identified in:

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1685

1785

1885

1985

1585

X-rays can penetrate in a solid matte through a distance of several:

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Kilo metres

Metres

Centimeters

A few angstroms

One micrometer

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

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1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

A metastable stae:

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Is an excited state

Is that in which excited electron is stable

Is that in which excited electron is usually unstable

Means a time interval of 10^-8second

Both (A) and (C)

The inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

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