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

Rutherford's model of atom failed because:

Question # 2

Pauli's principle is applicable to

Question # 3

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

Question # 4

Rutherford's experiment led to the discovery of

Question # 5

The number of neutrons in the element 94Be is

Question # 6

Bohr model of atom is contradicted by:

Question # 7

n + l value for 4f will

Question # 8

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Question # 9

When potassium metal is exposed to violet light

Question # 10

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 11

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

Question # 12

The charge over mass ratio of electron is:

Question # 13

Which is not true with respect to cathode rays?

Question # 14

The velocity of photon is:

Question # 15

Charge of an electron is:

Question # 16

The degenerate orbitals p-sub shell are

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

The uncertainty principle was stated only

Question # 21

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

Question # 22

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

Question # 23

Their e/m, ratio resembles with that of electrons

Question # 24

Schrodinger wave equation describes electron completely because

Question # 25

Which of the following is not charged particle

Question # 26

The quantum number which determines the shape of the orbital is

Question # 27

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

Question # 28

Which of the following was discovered first:

Question # 29

Charge on electron was discovered by:

Question # 30

Which of the following is not a sub-atomic particle

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Energy of electron in the infinite Bohr orbit of H-atom is
A. 0 KJ/mole
B. 1 KJ/mole
C. -1 KJ/mole
D. -1313.32 KJ/mole
2 Bohr model of atom is contradicted by:
A. Planck's quantum theory
B. Pauli's exclusion theory
C. Heisenberg's uncertainty principle.
D. All of above.
3 Their e/m, ratio resembles with that of electrons
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
4 n + l value for 4f will
A. 2
B. 5
C. 7
D. 9
5 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
6 Charge to mass ratio of electron was discovered by:
A. Millika.
B. Rutherford.
C. J.J. Thomson.
D. Chadwick.
7 Rutherford's experiment led to the discovery of
A. Nucleus
B. Electron
C. Proton
D. alpha particle
8 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is
A. N
B. Li
C. P
D. Na
9 Heaviest particle is
A. Meson
B. Neutron
C. Proton
D. Electron
10 The experimental evidences for the existence of atomic nucleus comes from:
A. Line spectrum of hydrogen.
B. Magnetic bonding of cathode rays.
C. Millikan oil drop experiment.
D. Scattering of alpha particles by thin metal foil.

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