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

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

Question # 2

The value of charge on electron is

Question # 3

Rutherford's planetary like picture of the atomic modal was defective because

Question # 4

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 5

The radius of second Bohr's orbit is

Question # 6

Bohr model of atom is contradicted by:

Question # 7

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

Question # 8

Charge of an electron is:

Question # 9

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

Question # 10

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

Question # 11

The value of Plank's constant 'h' is

Question # 12

The size of electronic shell is described by

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

Rutherford's experiment led to the discovery of

Question # 17

The principle quantum number describes

Question # 18

The charge over mass ratio of electron is:

Question # 19

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

Question # 20

Which of the following is not a property of cathode rays

Question # 21

The total values of magnetic quantum number of subshell are five, the subshell is

Question # 22

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

Question # 23

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

Question # 24

E = hv is the

Question # 25

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

Question # 26

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 # 27

The orbital in Rutherford's model is

Question # 28

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

Question # 29

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 30

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1
Question Image
A. Neutrons are attracted by nucleus
B. Neutrons carry out nuclear reactions
C. Neutrons carry no charge
D. Neutrons are electromagnetic radiations
2 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
3 n + l value for 4f will
A. 2
B. 5
C. 7
D. 9
4 With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:
A. Greater.
B. same.
C. Smaller.
D. Not fixed.
5 Anode is the surface on which probability of finding electron is:
A. 50%
B. Less than 10%.
C. More than 95%.
D. Zero.
6 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus
7 The size of electronic shell is described by
A. Azimuthal Q. no
B. Magnetic Q.No
C. Spin Q. No
D. Principle Q. No
8 Charge of an electron is:
A.

1.6 x 10-19 C

B.

9.1 x 10-34 C

C.

1.7588 x 1011 C

D.

6.62 x 10-34 C
9 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
10 Splitting of spectral lines when atoms are subjected to strong electric field is called:
A. Zeeman effect.
B. Stark effect
C. Photoelectric effect.
D. Compton effect.

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