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

Energy of electron in the infinite Bohr orbit of H-atom is

Question # 3

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

Question # 4

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

Question # 5

Neutron was discovered by:

Question # 6

Which of the following is not a property of cathode rays

Question # 7

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

Question # 8

The spectrum of He is expected to be similar to that of

Question # 9

The nature of positive ray depend on:

Question # 10

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 11

Mass of simple electron is:

Question # 12

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

Question # 13

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

Question # 14

The energy of ionization of an atom is the energy difference between orbital

Question # 15

The charge over mass ratio of electron is:

Question # 16

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 17

The spectrum of helium is expected to be similar to that of

Question # 18

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

Question # 19

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

Question # 20

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

Question # 21

Which is not true with respect to cathode rays?

Question # 22

Charge of an electron is:

Question # 23

Cathode rays emitted from cathode are

Question # 24

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

Question # 25

What is the packet of energy called?

Question # 26

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

Question # 27

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

Question # 28

Which of the following is not a sub-atomic particle

Question # 29

When potassium metal is exposed to violet light

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The configuration 1s22s22p53s1shows
A. Excited state of O2
B. Excited state of neon
C. Excited state of fluorine
D. Ground state of fluorine atom
2 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.
3 Neutron was discovered by:
A. Chadwick.
B. Bohr.
C. Rutherford.
D. Plank.
4 Which of the following particles has longest wavelength, if they have same speed:
A. Proton.
B. Neutron.
C. Electron.
D. Positron.
5 The radiations with wavelength shorter than violet light are called
A. Ultraviolet
B. Infrared
C. Microwave
D. Radio frequency
6 The degenerate orbitals p-sub shell are
A. 2
B. 3
C. 5
D. 7
7 The principle quantum number describes
A. The distance form the nucleus
B. The shape of the orbital
C. The orientation of the orbital
D. The spin of the electron
8 Which of the following was discovered first:
A. Charge to mass ratio of electrons.
B. Mass of electrons.
C. Charge of electrons.
D. All of above at same time.
9 The number of spherical nodes in 3p orbitals are
A. One
B. Three
C. Non
D. Two
10 The nature of the positive rays depend on
A. The nature of the electrode
B. The nature of the discharge tube
C. The nature of the residual gas
D. All of the above

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