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

Which of the following was discovered first:

Question # 2

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

Question # 3

n + l value for 4f will

Question # 4

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

Question # 5

Charge to mass ratio (e/m) of the electron is determined by

Question # 6

The radius of first orbit of hydrogen atom

Question # 7

The quantum number which describe the orientation of the orbitals is

Question # 8

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 # 9

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 10

Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

Question # 11

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

Question # 12

Rutherford's atomic model suggests the existence of

Question # 13

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

Question # 14

Charge of an electron is:

Question # 15

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

Question # 16

The charge over mass ratio of electron is:

Question # 17

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

Question # 18

The quantum number which determines the shape of the orbital is

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

The maximum number of electrons in a subshell for which l = 3 is

Question # 24

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

Question # 25

The nature of positive ray depend on:

Question # 26

The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:

Question # 27

What is the packet of energy called?

Question # 28

In the ground state of an atom the electron is present

Question # 29

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

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The radiations with wavelength shorter than violet light are called
A. Ultraviolet
B. Infrared
C. Microwave
D. Radio frequency
2 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series
3 The nature of positive ray depend on:
A. The nature of electrode.
B. The nature of discharge tube.
C. The nature of residual gas.
D. All of above.
4 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:
A. 500 NM.
B. 500 M.
C. 200 NM.
D. 5 x 107m
5 When cathode rays strike the anode metal X-rays are emitted and not the positive rays because
A. Cathode rays are material particles
B. Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place
C. Cathode rays are absorbed by the nucleus
D. Cathode rays become heated
6 Splitting of spectral lines when atoms are subjected to strong electron field is called
A. Zeeman effect
B. Stark effect
C. Photoelectric effect
D. Compton effect
7 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
8 Which have better penetrating power
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
9 The degenerate orbitals p-sub shell are
A. 2
B. 3
C. 5
D. 7
10 The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the
A. Orientation of orbital in space
B. Fact that two electrons in the same orbital should have opposite spins
C. Energy of the orbital
D. Spin of the electron

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