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

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

Question # 2

Orbitals having same energy are called

Question # 3

The radius of first orbit of H-atom is

Question # 4

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

Question # 5

The value of Plank's constant 'h' is

Question # 6

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 # 7

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

Question # 8

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

Question # 9

A 4f orbital has

Question # 10

Which have better penetrating power

Question # 11

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

Question # 12

When potassium metal is exposed to violet light

Question # 13

The number of spherical nodes in 3p orbitals are

Question # 14

Cathode rays emitted from cathode are

Question # 15

The mass of the neutron is of the order of

Question # 16

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

Question # 17

The e.m value for positive rays maximum for:

Question # 18

The experimental evidences for the existence of atomic nucleus comes from:

Question # 19

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

Question # 20

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

Question # 21

Photons of yellow colour are ______ energetic than violet colour

Question # 22

Charge on electron was discovered by:

Question # 23

Splitting of spectral lines when atoms are subjected to strong electron field is called

Question # 24

Orbital having same energy is called:

Question # 25

Energy of electron in first orbit of H atom is

Question # 26

The degenerate orbitals p-sub shell are

Question # 27

The number of neutrons in the element 94Be is

Question # 28

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 29

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

Question # 30

The total number of orbitals in a shell with principal quantum number 'n' is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
2 Their e/m, ratio resembles with that of electrons
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
3 In which of the following pairs, the numbers of electrons in the outermost shell are different?
A. As,Sb
B. Ge,Sn
C. In,pt
D. Se,Te
4 For which of the following sets of quantum numbers and electron will have the highest energy?
A. 3,2,1,1/2
B. 4,2,-1,1/2
C. 4,1,0,-1/2
D. 5,0,0,1/2
5 Balmer's series is in ______ region
A. Visible
B. U V
C. I. R.
D. None
6 A 4f orbital has
A. one node
B. two node
C. three node
D. four nodes
7 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell
8 The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is
A. 6.63 x 10-33m
B. 6.63 x 10-34m
C. 6.63 x 10-35m
D. 6.65 x 10-35m
9 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
10 Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:
A. Millikan.
B. J. Perrin.
C. Hittrof
D. J.J. Thomson.

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