Question # 1

The radiations with wavelength shorter than violet light are called

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Ultraviolet

Infrared

Microwave

Radio frequency

In which of the following pairs, the numbers of electrons in the outermost shell are different?

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As,Sb

Ge,Sn

In,pt

Se,Te

Rutherford's experiment led to the discovery of

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Nucleus

Electron

Proton

alpha particle

When electron jumps from n₂= 2,3,4,5,.... orbit to n₁= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

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Lyman series

Blamer series

Paschen series

Brackett series

What is the packet of energy called?

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Electron

Photon

Positron

Proton

Balmer's series is in ______ region

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Visible

U V

I. R.

None

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

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6.63 x 10^-33m

6.63 x 10^-34m

6.63 x 10^-35m

6.65 x 10^-35m

Neutrons was discovered by

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Mosely

Milliken

Chadwick

Ruherford

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

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Paschen

Pfund

Balmer

Brackett

The energy of ionization of an atom is the energy difference between orbital

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Orbital having same energy is called:

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Hybrid orbital.

Valence orbital.

Degenerate orbital.

D-orbital.

The maximum number of electrons in a subshell for which l = 3 is

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14

10

8

4

n + l value for 4f will

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2

5

7

9

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

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Na

O

Cl

N

Heaviest particle is

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Meson

Neutron

Proton

Electron

The uncertainty principle was stated only

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De Brogilie

Heinsenberg

Einstein

Schrodinger

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

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1

4

9

12

Which of the following is not a sub-atomic particle

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Electron

Proton

Neutron

Deuteron

Their e/m, ratio resembles with that of electrons

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Alpha rays

Beta rays

Gamma rays

X-rays

Which of the following is not charged particle

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Proton

Electron

Neutron

Hydrogen nucleus

The charge of an electron is determined by

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J.J. Thomson

Crooks

Perrin

R.A.Millikan

The nature of the positive rays depend on

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The nature of the electrode

The nature of the discharge tube

The nature of the residual gas

All of the above

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

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Fourth Bohr orbit to the first Bohr orbit

Fifth Bohr orbit to the second Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

Maximum potential energy that an electron can have within the atom is:

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Equal to zero.

Less than zero.

Greater than zero.

Infinite

The quantum number which determines the shape of the orbital is

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principal

azimuthal

magnetic

spin

Effective magnetic moment of Sc³⁺ion is

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1.73

0

5.92

2.83

The wave number of the line emitted is 109.678 x 10⁵m^-1in the Lyman series when electron transition occurs

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The wave length of electron as wave is 0.5 nm. What is the wave length in meter

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5 x 10^-9

5 x 10^-12

5 x 10^-6

5 x 10^-10

Neutron was discovered by:

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Chadwick.

Bohr.

Rutherford.

Plank.

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Plank's equations

de Broglie's equations

Heisenburg's equation

None

The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?

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6

11

17

23

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