Question # 1

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

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Zeeman effect.

Stark effect

Photoelectric effect.

Compton effect.

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

Orbital having same energy is called:

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Hybrid orbital.

Valence orbital.

Degenerate orbital.

D-orbital.

Which of the following particles has longest wavelength, if they have same speed:

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Proton.

Neutron.

Electron.

Positron.

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

Cathode rays emitted from cathode are

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Canal rays

Protons

Electrons

Positrons

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

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Alpha rays.

Negative particles.

Electromagnetic rays.

Positive particles.

Heaviest particle is

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Meson

Neutron

Proton

Electron

The value of Plank's constant 'h' is

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6.625 x 10^-34

6.625 x 10^-34J sec

6.625 x 10^-34KJ

6.625 x 10^-34K Cal

In the ground state, an element has 13 electrons in its M shell. The element is

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Copper

Chromium

Nickel

Iron

The divisibility of atom was shown by

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Stoney

J.J. Thomson

Millikan

Rutherford

Charge on electron was discovered by:

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Millikan.

Crook.

Neil Bohr.

Rutherford.

Which one of the following statements is true about discovery of neutrons?

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These particles were formed by the bombardment of Alpha-particles on Beryllium.

These particles are formed by the spiting of alpha-particles.

These particles were discovered by natural radioactivity.

None of above.

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

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Na

O

Cl

N

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s

p

d

f

When potassium metal is exposed to violet light

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Ejection of electrons takes place

Ejection of some potassium atoms occurs

There is no effect

The absorption of electrons takes place

The valence orbital configuration of an element with atomic number 23 is

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3d⁵

3d³, 4s²

3d³, 4s¹, 4p¹

3d²,4s²,4p¹

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

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Gas molecules collide with anode

Gas molecules are at high temperature

Gas molecules produce X-rays

Cathode rays remove electrons from gas molecules

1 erg of energy corresponds to

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6.02 x 10²³J/mol

6.02 x 10¹⁶J/mol

1 erg/mol

10^-7J/mol

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

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low ionization energy of sodium

sublimation of metallic sodium to give yellow vapour

emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region

photosenitivity

When 3p orbital is complete, the entering electron goes into

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4s

3d

4p

4f

Rutherford's planetary like picture of the atomic modal was defective because

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It did not describe the quantity of positive charge

It did not explain the repulsion of protons within the nucleus

No empty space between nucleus and the electrons

Moving electron should radiate energy

If the radius of first Bohr orbit be a_o, then the radius of third Bohr orbit would be

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3 x a_o

6 x a_o

9 x a_o

1/2 x a_o

The size of electronic shell is described by

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Azimuthal Q. no

Magnetic Q.No

Spin Q. No

Principle Q. No

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

Energy of electron in first orbit of H atom is

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-45.32 KJ/mole

-82.08 KJ/mole

-52.53 KJ/mole

-1313.31 KJ/mole

What is the packet of energy called?

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Electron

Photon

Positron

Proton

When 6s orbital is complete then next electron goes to

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6p

6d

5d

4f

The wave number of light emitted by a certain source is 2 x 10⁵m. The wavelength of this light will be:

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500 NM.

500 M.

200 NM.

5 x 10⁷m

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Plank's equations

de Broglie's equations

Heisenburg's equation

None

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