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

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

Question # 2

A 4f orbital has

Question # 3

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

Question # 4

When potassium metal is exposed to violet light

Question # 5

The divisibility of atom was shown by

Question # 6

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

Question # 7

Charge on electron was discovered by:

Question # 8

If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be

Question # 9

Which of the following is not a property of cathode rays

Question # 10

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 11

The quantum number which determines the shape of the orbital is

Question # 12

Which one of the following statements is true about discovery of neutrons?

Question # 13

The charge of an electron is determined by

Question # 14

The radius of first orbit of H-atom is

Question # 15

In the ground state of an atom, the electron is present:

Question # 16

Orbital having same energy is called:

Question # 17

n + l value for 4f will

Question # 18

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

Question # 19

Heaviest particle is

Question # 20

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

Question # 21

Orbitals having same energy are called

Question # 22

Bohr model of atom is contradicted by:

Question # 23

The energy of the first electron is helium will be

Question # 24

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

Question # 25

E = hv is the

Question # 26

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

Question # 27

The quantum number which describe the orientation of the orbitals is

Question # 28

Which of the following orbitals have a dumb bell shape?

Question # 29

Spectrum of white light is continuous becuase

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Pauli's principle is applicable to
A. Degenerate orbits
B. Two electrons in the same orbital
C. One electron
D. None
2 e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because
A. Cathode rays are small sized particles
B. Cathode rays have same charge
C. Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases
D. Temperature of cathode rays higher
3 Photons of yellow colour are ______ energetic than violet colour
A. More
B. Less
C. Equal
D. None
4 The total number of orbitals possible for the quantum number n is
A. n
B. n2
C. 2n
D. 2n2
5 The radiations with wavelength shorter than violet light are called
A. Ultraviolet
B. Infrared
C. Microwave
D. Radio frequency
6 A 4f orbital has
A. one node
B. two node
C. three node
D. four nodes
7 Smallest charge of electricity that has been measured so far is
A. Charge on a-rays
B. Charge on electron (1.602 x 10-19C)
C. Charge on x-rays
D. Charge on gamma rays
8 The value of R (Rydberg's constant) is _______ m-1
A. 1.0974 x 107
B. 1.0842 x 107
C. 1.082 x 10-7
D. Both a and b
9 When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as
A. Paschen
B. Pfund
C. Balmer
D. Brackett
10 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

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