Question # 1

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

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Neutrons are attracted by nucleus

Neutrons carry out nuclear reactions

Neutrons carry no charge

Neutrons are electromagnetic radiations

The orbitals having n + l = 5 are

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2p, 3d,3s

3p, 3d, 5s

3s, 4p, 4d

5s, 4p, 3d

Mass of simple electron is:

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9.1 x 10^-31 kg

9.1 x 10^-30 kg

1.66 x 10^-31 kg

9.1 x 10^-31 kg

The divisibility of atom was shown by

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Stoney

J.J. Thomson

Millikan

Rutherford

The charge of an electron is determined by

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J.J. Thomson

Crooks

Perrin

R.A.Millikan

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

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H

Na

He⁺

Li⁺

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

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Cathode rays travel in straight lines

Cathode rays are negatively charged

Cathode rays produce x-rays

Cathode rays are material particles having momentum

Which of the following has more unpaired d-electrons?

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Zn⁺

Fe²⁺

Ni³⁺

Cu⁺

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

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

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

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Greater.

same.

Smaller.

Not fixed.

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 orbital in Rutherford's model is

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Spiral

Circular

Both

None

What is the packet of energy called?

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Electron

Photon

Positron

Proton

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

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E = hv is the

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Spectral equation

Plank's equation

de Broglie's equation

None of these

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.

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

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.

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 quantum number which determines the shape of the orbital is

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principal

azimuthal

magnetic

spin

When electrons revolve in stationary orbits

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

The nature of positive rays depend on:

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Nature of discharge tube.

Nature of resident gas.

Nature of electrode.

All of above.

The limiting line of Blamer series in hydrogen spectrum lies in

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Visible regions

Ultraviolet region

Infrared region

x-rays region

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

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

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Hund's rule

Pauli exclusion principle

Aufbau principle

Mosley's law

The radius of second Bohr's orbit is

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0.053 nm

0.053/4 nm

0.053 x 4 nm

0.053 x 20 nm

Subsidiary quantum number specifies

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size of orbital

shape of orbital

orientations of orbitals

Nuclear stability

Orbitals having same energy are called

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Hybrid orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

n + l value for 4f will

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2

5

7

9

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