Question # 1

In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:

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Infinite energy

Maximum energy

Minimum energy

Zero energy

An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.

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6

5

4

3

The 1^st Bohr atom in the hydrogen atom has radius

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3.56 x 10^-10 m

0.053 x 10^-11 m

0.53 x 10^-11 m

5.30 x 10^-11 m

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

The unit of Rh is.

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ms-1

m

m²

m^-1

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

1 rem =

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0.001 SV

0.01 SV

0.1 SV

1.01 SV

Which series lies in the ultraviolet region.

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Balmer series

Bracket series

Ptund series

Lyman series

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

The Balmer series is obtained when all the transition of electrons terminate on

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1^st orbit

2nd orbit

3rd orbit

4th orbit

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

Helium Neon Laser Beam emitted from discharge tube has a colour.

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Blue

Green

Red

Black

In an electronic transition atom cannot emit.

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Infrared radiations

Visible radiations

Ultraviolet radiations

Gama radiations

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

The velocity of electron moving is 1st orbit of hydrogen atom is:

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2.09 x 10⁶ ms^-1

2.18 x10⁶ ms^-1

2.19 x 10⁶ ms^-1

3.18 x10⁶ ms^-1

Which of the following is one of the spectral series of atomic hydrogen?

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Brockett series

Balmer series

P fund series

All of above

The typical nuclei are less than:

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10^-16m

10^-14m

10^-12m

10^-10m

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