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 electron in an atom

Question # 2

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

Question # 3

Quantum number value for 2p orbitals are:

Question # 4

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 5

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

Question # 6

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

Question # 7

Charge of an electron is:

Question # 8

Effective magnetic moment of Sc3+ion is

Question # 9

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

Question # 10

The uncertainty principle was stated only

Question # 11

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

Question # 12

Light emitted from a source has its wave length 500nm, then its wave number will be

Question # 13

When electrons revolve in stationary orbits

Question # 14

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

Question # 15

The velocity of photon is:

Question # 16

1 erg of energy corresponds to

Question # 17

Balmer's series is in ______ region

Question # 18

The nature of positive rays depend on:

Question # 19

Which of the following orbitals have a dumb bell shape?

Question # 20

The nature of the positive rays depend on

Question # 21

Anode is the surface on which probability of finding electron is:

Question # 22

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

Question # 23

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

Question # 24

Which of the following is not a property of cathode rays

Question # 25

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 26

In the ground state of an atom the electron is present

Question # 27

Rutherford's model of atom failed because:

Question # 28

The energy of the first electron is helium will be

Question # 29

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

Question # 30

Quantum number values for 2p orbitals are

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1
Question Image
A. s
B. p
C. d
D. f
2 The charge over mass ratio of electron is:
A.

1.6 x 10-1 C Kg-1

B.

9.1 x 10-31 C Kg-1

C.

1.7588 x 1011 C Kg-1

D.

6.62 x 10-34 C Kg-1
3 The mass of the neutron is of the order of
A. 10-23 kg
B. 10-24kg
C. 10-26kg
D. 10-27kg
4 Pauli's principle is applicable to
A. Degenerate orbits
B. Two electrons in the same orbital
C. One electron
D. None
5 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
6 Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively
A. 12 and 4
B. 16 and 5
C. 16 and 4
D. 12 and 5
7 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
8 Spectrum of white light is continuous becuase
A. Colors separated by dark spaces
B. There are no boundary lines between the colours
C. The radiations are in infrared region
D. The radiatins fall in ultraviolet region
9 What is the packet of energy called?
A. Electron
B. Photon
C. Positron
D. Proton
10 An electron with n = 3 , l = 2 will be in the sub-shell
A. 3p
B. 3d
C. 3f
D. 3s

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