Question # 1

Which series lies in the ultraviolet region.

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Balmer series

Bracket series

Ptund series

Lyman series

Charge on positron is:

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Negative

Positive

Netural

None of these

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

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

Life time of metastable states is

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10^-6 sec or more

10^-3 sec or more

10^-5 sec or more

None of these

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

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

A° is the unit of:

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Energy

Length

Nuclear energy

Work

The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is

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1972

1965

1958

1913

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

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

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

Charge on an atom is:

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Positive

Negative

Neutral

None of these

The unit of Rh is.

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ms-1

m

m²

m^-1

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Physics ICS Part 2 Chapter 20 Online MCQ's Test MCQs With Answers

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