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

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

Question # 2

The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 3

Orbitals having same energy are called

Question # 4

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 5

Rutherford's model of atom failed because:

Question # 6

The nature of positive rays depend on:

Question # 7

The quantum number which describe the orientation of the orbitals is

Question # 8

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

Question # 9

Pauli's principle is applicable to

Question # 10

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

Question # 11

Smallest charge of electricity that has been measured so far is

Question # 12

Spectrum of white light is continuous becuase

Question # 13

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 14

The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

Question # 15

The quantum number which describes the shape of the orbital is

Question # 16

When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

Question # 17

The range of visible spectrum is

Question # 18

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

Question # 19

The number of neutrons in the element 94Be is

Question # 20

The mass of the neutron is of the order of

Question # 21

The size of electronic shell is described by

Question # 22

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

Question # 23

What is the packet of energy called?

Question # 24

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

Question # 25

Which of the following orbitals have a dumb bell shape?

Question # 26

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

Question # 27

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

Question # 28

Which of the following is not a sub-atomic particle

Question # 29

The radiations with wavelength shorter than violet light are called

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by
A. Gas molecules collide with anode
B. Gas molecules are at high temperature
C. Gas molecules produce X-rays
D. Cathode rays remove electrons from gas molecules
2 Alpha rays consist of:
A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.
3 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
4 Pauli's principle is applicable to
A. Degenerate orbits
B. Two electrons in the same orbital
C. One electron
D. None
5 The value of Plank's constant 'h' is
A. 6.625 x 10-34
B. 6.625 x 10-34J sec
C. 6.625 x 10-34KJ
D. 6.625 x 10-34K Cal
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 Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called
A. Stark effect
B. Zeeman effect
C. Compton effect
D. Photoelectric effect
8 The number of spherical nodes in 3p orbitals are
A. One
B. Three
C. Non
D. Two
9 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
10 1 erg of energy corresponds to
A. 6.02 x 1023J/mol
B. 6.02 x 1016J/mol
C. 1 erg/mol
D. 10-7J/mol

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