Question # 1

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

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

Orbital having same energy is called:

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Hybrid orbital.

Valence orbital.

Degenerate orbital.

D-orbital.

Charge to mass ratio of electron was discovered by:

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Millika.

Rutherford.

J.J. Thomson.

Chadwick.

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Plank's equations

de Broglie's equations

Heisenburg's equation

None

Azimuthal quantum number of last electron of ₁₁Na is

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1

2

3

0

Energy of electron in the infinite Bohr orbit of H-atom is

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0 KJ/mole

1 KJ/mole

-1 KJ/mole

-1313.32 KJ/mole

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

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Copper

Chromium

Nickel

Iron

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

The divisibility of atom was shown by

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Stoney

J.J. Thomson

Millikan

Rutherford

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

The electronic configuration of an atom/ion can be defined by the following

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Aufbau principle

Pauli's exclusion principle

Hund's Rule

All the above

Which of the following has more unpaired d-electrons?

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Zn⁺

Fe²⁺

Ni³⁺

Cu⁺

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 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

The e.m value for positive rays maximum for:

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Oxygen.

Nitrogen.

Helium.

Hydrogen.

The symbol of the element whose atoms have the outer most electronic configuration 2s²2p³is

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N

Li

P

Na

Their e/m, ratio resembles with that of electrons

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Alpha rays

Beta rays

Gamma rays

X-rays

The total number of orbitals possible for the quantum number n is

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n

n²

2n

2n²

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.

The radiations with wavelength shorter than violet light are called

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Ultraviolet

Infrared

Microwave

Radio frequency

The range of visible spectrum is

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300 - 600 nm

600 - 900 nm

400 - 750 nm

100 - 300 nm

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

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

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Increases

Decreases

Reaming same

Orbits coincide

Which have better penetrating power

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Alpha rays

Beta rays

Gamma rays

X-rays

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

Balmer's series is in ______ region

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Visible

U V

I. R.

None

The number of electrons in the M shell of the element with atomic number 24 is

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24

12

13

8

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

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

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Balmer series

Lyman series

Pfund series

Brackett series

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

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