Question # 1

Which is not true with respect to cathode rays?

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A stream of electrons

Charged particles

Move with speed as that of light

Can be deflected by magnetic fields

The limiting line of Blamer series in hydrogen spectrum lies in

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Visible regions

Ultraviolet region

Infrared region

x-rays region

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

The spectrum of He is expected to be similar to that of

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H

Na

He⁺

Li⁺

The radiations with wavelength shorter than violet light are called

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Ultraviolet

Infrared

Microwave

Radio frequency

The electron in an atom

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moves randomly around the nucleus

has fixed space around the nucleus

is stationary in various energy levels

moves around its nucleus in definite energy levels

Energy of electron in an orbit according to Bohr theory is negative due to

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Repulsion of electrons in the same orb

At infinity energy is zero ad a traction towards nucleus decreases energy

Electron has negative charge

Product of positive nuclear charge and negative charge is negative

Azimuthal quantum number of last electron of ₁₁Na is

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1

2

3

0

Charge to mass ratio (e/m) of the electron is determined by

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R. A. Millikan

J. J. Thompson

G. J, Stoney

None of these

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

Pauli's principle is applicable to

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Degenerate orbits

Two electrons in the same orbital

One electron

None

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remains constant

Decreases for low value of Z and increase for higher value of Z

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

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Microwave > infrared > visible > ultraviolet

Visible > ultraviolet > microwave > infrared

Ultraviolet > visible > infrared > microwave

Infrared > microwave > ultraviolet > visible

In the ground state of an atom, the electron is present:

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In the nucleus.

In the second shell.

Nearest to the nucleus.

farthest from the nucleus.

The total values of magnetic quantum number of subshell are five, the subshell is

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S-subshell

P-subshell

D-subshell

F-subshell

E = hv is the

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Spectral equation

Plank's equation

de Broglie's equation

None of these

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

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0, 1, 2, 3

+3, +2, +1, -1, -2, -3

0, -1, -2 ,-3

-3, 0, +3

Subsidiary quantum number specifies

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size of orbital

shape of orbital

orientations of orbitals

Nuclear stability

Quantum number value for 2p orbitals are:

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n=2 ,l=1

n=1 ,l=2

n= ,l=0

n=2 ,l=0

Rutherford's experiment led to the discovery of

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Nucleus

Electron

Proton

alpha particle

The quantum number which describes the shape of the orbital is

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Principle quantum number

Spin quantum number

Azimathal quantum number

Magnetic quantum number

In the ground state of an atom, the electron is present

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

The range of visible spectrum is

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300 - 600 nm

600 - 900 nm

400 - 750 nm

100 - 300 nm

Neutron was discovered by:

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Chadwick.

Bohr.

Rutherford.

Plank.

Splitting of spectral lines when atoms are subjected to strong electron field is called

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Zeeman effect

Stark effect

Photoelectric effect

Compton effect

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1. The wavelength of this light will be

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500 nm

500 m

200 nm

5 x 10⁷m

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

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12 and 4

16 and 5

16 and 4

12 and 5

Which of the following was discovered first:

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Charge to mass ratio of electrons.

Mass of electrons.

Charge of electrons.

All of above at same time.

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

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3 and 5

3 and 7

3 and 9

2 and 5

The energy of the first electron is helium will be

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-13.6 eV

-54.4 eV

-5.44 eV

zero

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