Question # 1

The charge on electron was determined by millikan in his oil drop experiment and its value is

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6.023 x 10^-23C

1.602 x 10^-23C

1.602 x 10^-19C

6.625 x 10^-34C

In the ground state of an atom the electron is present.

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In the nuclsus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

In discharge tube, properties of X-rays depend upon the nature of.

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Residual gas

Cathode plate

Anode plate

All of these

When atoms are subjected to strong electric field, splitting of spectral lines is called.

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Zeeman effect

stark effect

Photoelectric effect

Compton effect

The azimuthal quantum number / = 2, then M(Magnetic quantum number) can have values as

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+1, -1

+1, 0, -1

+2, +1, 0,1, -1, 2

+3, +2, +1, 0, 1, -2, -3

Bohr's model of atom, is contradicted by.

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Planck quantum theory

Pauli's exclusion prinsciple

Heisenberg's uncertainty principle

All of the above

When fast neutron carries nuclear reaction with nitrogen it ejects aprticles.

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Alpha

Gamma

Beta

Nil

An orbital which is spherical and symmetrical is

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S-Orbital

P - Orbital

d- Orbital

f - Orbital

Quantum number values for 3p orbitals are.

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n = 0, l = 3

n = 3 , l = 1

n = 2, l = 1

n = 2 , l = 3

Cathode rays cast shadow when an opaque object is placed in their path. This behavior of cathode rays show that.

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They move is straight line

They are negatively charge

They possess momentum

They are energetic

Which of the following represents electronic configuration of the most electropositive elements

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He [ 2s^-1]

Xe [6s¹]

He [2s²]

Xe [6s²]

When 6d orbital is complete, the entering electron goes into.

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7f

7s

7p

7d

Hund's rule state that when electrons enter to the same sub levels they are.

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Singly occupied with same spin

Doubly occupy with same spin

Singly occupied with different spin

Doubly occupied with different spin

The electron in a subshell is filled according to formula.

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2n²

2(2l+1)

(2l+1)

None of these

From which quantum number is the shape of an orbital determined.

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Principal

Magnetic

Azimuthal

Spin

De Broglie equation treats electron to be.

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A particle

Wave

Both particle and wave

None of these

When 5d orbital is completed them entering electron goes into.

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6s

6p

6d

6f

The velocity of photon is

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Independent of its wavelength

Depends on its wavelength

Equal to square of its amplitude

Depends on its source

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