Question # 1

The inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

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)

The first series which was identified in the spectrum of hydrogen is called:

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Lyman series

Balmer series

Paschen series

Brackett series

Pfund series

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

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

The holes created in the L and M shells are occupied by transitions of:

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Electrons from lower states

Electrons from higher state

Positrons from higher states

Electrons from K shell

Both (A) and (B)

The results of spectra obtained by Balmer were expressed in 1896 by:

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Bohr

Rydberg

Planck

Rutherford

Coulomb

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

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

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

Braking radiation causes:

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Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

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 results of spectra obtained by Blamer were expressed in 1896 by

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Bohr

Rydberg

Planck

Rutherford

Coulomb

Graph of Black body radiation is example of

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Band spectra

Continuo's spectra

Line spectra

All

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

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

Coulomb multiplied by volt by volt gives the unit called:

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farad

Ohm

Second

joule

Watt

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