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 energy of the first electron is helium will be

Question # 2

The divisibility of atom was shown by

Question # 3

Energy of electron in first orbit of H atom is

Question # 4

Which of the following is not a property of cathode rays

Question # 5

The degenerate orbitals p-sub shell are

Question # 6

The value of charge on electron is

Question # 7

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Question # 8

The nature of the positive rays depend on

Question # 9

The four quantum numbers of the valency electron of potassium are

Question # 10

The mass of the neutron is of the order of

Question # 11

Orbital having same energy is called:

Question # 12

The quantum number which describes the shape of the orbital is

Question # 13

Subsidiary quantum number specifies

Question # 14

The e.m value for positive rays maximum for:

Question # 15

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

Question # 16

The radiations with wavelength shorter than violet light are called

Question # 17

Energy of electron in an orbit according to Bohr theory is negative due to

Question # 18

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

Question # 19

The nature of positive ray depend on:

Question # 20

The charge over mass ratio of electron is:

Question # 21

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

Question # 22

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

Question # 23

The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 24

Neutrons was discovered by

Question # 25

Proton was discovered by:

Question # 26

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

Question # 27

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Question # 28

The credit of discovering neutron goes to

Question # 29

The total number of orbitals possible for the quantum number n is

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The four quantum numbers of the valency electron of potassium are
A. 4,1,1,1/2
B. 4,0,0,1/2
C. 4,1,0,1/2
D. 4,4,0,1/2
2 Rutherford's planetary like picture of the atomic modal was defective because
A. It did not describe the quantity of positive charge
B. It did not explain the repulsion of protons within the nucleus
C. No empty space between nucleus and the electrons
D. Moving electron should radiate energy
3 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°
4 Which one of the following statements is true about discovery of neutrons?
A. These particles were formed by the bombardment of Alpha-particles on Beryllium.
B. These particles are formed by the spiting of alpha-particles.
C. These particles were discovered by natural radioactivity.
D. None of above.
5 The radiations with wavelength shorter than violet light are called
A. Ultraviolet
B. Infrared
C. Microwave
D. Radio frequency
6 The value of charge on electron is
A. 1.602 x 10-19coulombs
B. 1.602 x 10-18coulombs
C. 1.602 x 10-17coulombs
D. 1.602 x 10-16 coulombs
7 E = hv is the
A. Spectral equation
B. Plank's equation
C. de Broglie's equation
D. None of these
8 The total number of orbitals possible for the quantum number n is
A. n
B. n2
C. 2n
D. 2n2
9 The quantum number which describes the shape of the orbital is
A. Principle quantum number
B. Spin quantum number
C. Azimathal quantum number
D. Magnetic quantum number
10 The uncertainty principle was stated only
A. De Brogilie
B. Heinsenberg
C. Einstein
D. Schrodinger

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