Question # 1

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.

In Millikan method for determination of charge on electron the air in the chamber is ionized by

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Protons

Electric field

X-rays

a - particles

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

The divisibility of atom was shown by

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Stoney

J.J. Thomson

Millikan

Rutherford

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

Light emitted from a source has its wave length 500nm, then its wave number will be

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2 x 10⁶m^-1

2 x 10⁷m^-1

5 x 10⁸m^-1

5 x 10⁹m^-1

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

Cathode rays emitted from cathode are

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Canal rays

Protons

Electrons

Positrons

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

Orbitals having same energy are called

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Hybrid orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

Rutherford's model of atom failed because:

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The atom did o have a nucleus and electrons

It did not account fro the attraction b/w protons and neutrons

It did no account for the stability of the atom.

There is actually no space b/w the nucleus ad the electrons.

Azimuthal quantum number of last electron of ₁₁Na is

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1

2

3

0

Schrodinger wave equation describes electron completely because

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It describes a set of four quantum number

It describes the particle nature of electron

It measures wavelength of electron

It describes electron moving in specific orbit

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

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Cathode rays are material particles

Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place

Cathode rays are absorbed by the nucleus

Cathode rays become heated

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

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 experimental evidences for the existence of atomic nucleus comes from:

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Line spectrum of hydrogen.

Magnetic bonding of cathode rays.

Millikan oil drop experiment.

Scattering of alpha particles by thin metal foil.

Charge of an electron is:

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1.6 x 10^-19 C

9.1 x 10^-34 C

1.7588 x 10¹¹ C

6.62 x 10^-34 C

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 radiations with wavelength shorter than violet light are called

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Ultraviolet

Infrared

Microwave

Radio frequency

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

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

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Plank's equations

de Broglie's equations

Heisenburg's equation

None

The number of de-electrons retained in Fe²⁺(At.No. of Fe = 26) ions is

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3

4

5

6

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

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dxy

dxz

dz²

dx²- y²

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

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

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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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

Their e/m, ratio resembles with that of electrons

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Alpha rays

Beta rays

Gamma rays

X-rays

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