ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

Try The MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

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ECAT Chemistry Chapter 5 Atomic Structure

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Question # 1

The radiations with wavelength shorter than violet light are called

Question # 2

The range of visible spectrum is

Question # 3

Neutrons was discovered by

Question # 4

The value of R (Rydberg's constant) is _______ m-1

Question # 5

1 erg of energy corresponds to

Question # 6

Which of the following was discovered first:

Question # 7

Maximum potential energy that an electron can have within the atom is:

Question # 8

Which of the following is not a property of cathode rays

Question # 9

The total number of orbitals in a shell with principal quantum number 'n' is

Question # 10

The charge over mass ratio of electron is:

Question # 11

The experimental evidences for the existence of atomic nucleus comes from:

Question # 12

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 13

What is the packet of energy called?

Question # 14

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

Question # 15

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

Question # 16

Proton was discovered by:

Question # 17

For a 3P subshell the set of principle and azimuthal quantum number is

Question # 18

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

Question # 19

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Question # 20

Photons of yellow colour are ______ energetic than violet colour

Question # 21

In the ground state of an atom the electron is present

Question # 22

Smallest charge of electricity that has been measured so far is

Question # 23

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

Question # 24

The radius of second Bohr's orbit is

Question # 25

When potassium metal is exposed to violet light

Question # 26

A 4f orbital has

Question # 27

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

Question # 28

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

Question # 29

The nature of positive rays depend on:

Question # 30

The quantum number which determines the shape of the orbital is

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Sr.# Question Answer
1 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
2 Orbital having same energy is called:
A. Hybrid orbital.
B. Valence orbital.
C. Degenerate orbital.
D. D-orbital.
3 Which of the following is not a property of cathode rays
A. They can produce x-rays when they strike a heavy metal anode
B. They can cause reduction reaction
C. They produce fluorescence in rare earth and minerals
D. They comprise neutral particles
4 In the ground state of an atom, the electron is present:
A. In the nucleus.
B. In the second shell.
C. Nearest to the nucleus.
D. farthest from the nucleus.
5 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
6 Charge to mass ratio (e/m) of the electron is determined by
A. R. A. Millikan
B. J. J. Thompson
C. G. J, Stoney
D. None of these
7 Rutherford's atomic model suggests the existence of
A. Atom
B. Nucleus
C. alpha particle
D. Measons
8 Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the
A. low ionization energy of sodium
B. sublimation of metallic sodium to give yellow vapour
C. emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region
D. photosenitivity
9 The electron in an atom
A. moves randomly around the nucleus
B. has fixed space around the nucleus
C. is stationary in various energy levels
D. moves around its nucleus in definite energy levels
10 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus

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