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

00:00
Question # 1

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Question # 2

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

Question # 3

The order of distance between the various Bohr orbits is

Question # 4

The radius of first orbit of H-atom is

Question # 5

The charge over mass ratio of electron is:

Question # 6

Which is not true with respect to cathode rays?

Question # 7

The total number of possible values of magnetic quantum number for the value of l=3 is

Question # 8

The uncertainty principle was stated only

Question # 9

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

Question # 10

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 11

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 12

The velocity of photon is:

Question # 13

Which of the following is not isoelectronic?

Question # 14

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

Question # 15

Subsidiary quantum number specifies

Question # 16

Azimuthal quantum number of last electron of 11Na is

Question # 17

The e.m value for positive rays maximum for:

Question # 18

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Question # 19

The energy of the first electron is helium will be

Question # 20

The credit of discovering neutron goes to

Question # 21

The ratio of the ionization energy of H and Be3+is

Question # 22

Which of the following particles has longest wavelength, if they have same speed:

Question # 23

Which of the following orbitals have a dumb bell shape?

Question # 24

Neutron was discovered by:

Question # 25

Cathode rays emitted from cathode are

Question # 26

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

Question # 27

Neutrons was discovered by

Question # 28

Schrodinger wave equation describes electron completely because

Question # 29

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

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
2 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
3 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell
4 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
5 The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?
A. 6
B. 11
C. 17
D. 23
6 Electrons in degenerate orbitals are placed in separate orbitals with same spin according to
A. Hund's rule
B. Pauli exclusion principle
C. Aufbau principle
D. Mosley's law
7 Which of the following orbitals have a dumb bell shape?
A. s
B. p
C. d
D. f
8 The nature of the positive rays depend on
A. The nature of the electrode
B. The nature of the discharge tube
C. The nature of the residual gas
D. All of the above
9 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
10
Question Image
A. s
B. p
C. d
D. f

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