Question # 1

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 nature of positive ray depend on:

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The nature of electrode.

The nature of discharge tube.

The nature of residual gas.

All of above.

When 6s orbital is complete then next electron goes to

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6p

6d

5d

4f

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

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

An electron with n = 3 , l = 2 will be in the sub-shell

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3p

3d

3f

3s

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

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1

4

9

12

The range of visible spectrum is

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300 - 600 nm

600 - 900 nm

400 - 750 nm

100 - 300 nm

Pauli's principle is applicable to

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Degenerate orbits

Two electrons in the same orbital

One electron

None

For which of the following sets of quantum numbers and electron will have the highest energy?

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3,2,1,1/2

4,2,-1,1/2

4,1,0,-1/2

5,0,0,1/2

The four quantum numbers of the valency electron of potassium are

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4,1,1,1/2

4,0,0,1/2

4,1,0,1/2

4,4,0,1/2

Orbitals having same energy are called

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Hybrid orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

Which of the following is not a sub-atomic particle

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Electron

Proton

Neutron

Deuteron

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

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The radiations emitted in emission spectrum are absorbed in absorption spectrum

Atomic emission spectrum is continuous

Atomic absorption spectrum is continuous

Distance between the lines increases

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

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

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24

12

13

8

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

The number of neutrons in the element ⁹₄Be is

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4

5

9

13

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

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

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4s

3d

4p

4f

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

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

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.

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.

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

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 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

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 charge of an electron is determined by

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J.J. Thomson

Crooks

Perrin

R.A.Millikan

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.

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Plank's equations

de Broglie's equations

Heisenburg's equation

None

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