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 the light emitted by a certain source is 2 x 106m-1. The wavelength of this light will be

Question # 2

Charge of an electron is:

Question # 3

Cathode rays emitted from cathode are

Question # 4

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

Question # 5

Neutron was discovered by:

Question # 6

The four quantum numbers of the valency electron of potassium are

Question # 7

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

Question # 8

Energy of electron in first orbit of H atom is

Question # 9

The velocity of photon is:

Question # 10

The quantum number which describe the orientation of the orbitals is

Question # 11

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

Question # 12

Quantum number value for 2p orbitals are:

Question # 13

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

Question # 14

Orbital having same energy is called:

Question # 15

Which of the following is not charged particle

Question # 16

Which of the following orbitals have a dumb bell shape?

Question # 17

The mass of the neutron is of the order of

Question # 18

The nature of positive rays depend on:

Question # 19

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

Question # 20

Rutherford's model of atom failed because:

Question # 21

The orbital in Rutherford's model is

Question # 22

The number of electrons in the M shell of the element with atomic number 24 is

Question # 23

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

Question # 24

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

Question # 25

In the ground state of an atom the electron is present

Question # 26

For principle quantum number n=4, the total number of orbitals having l = 3 is

Question # 27

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

Question # 28

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 29

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

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits
A. Increases
B. Decreases
C. Reaming same
D. Orbits coincide
2 An orbital can accommodate maximum two electrons with opposite spins according to
A. Heisenberg's principle
B. Aufbau principle
C. Hund's srule
D. Pauli exclusion principle
3 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.
4 The quantum number which describe the orientation of the orbitals is
A. Spin quantum number
B. Principle quantum number
C. Azimathal quantum number
D. Magnetic quantum number
5 Light emitted from a source has its wave length 500nm, then its wave number will be
A. 2 x 106m-1
B. 2 x 107m-1
C. 5 x 108 m-1
D. 5 x 109m-1
6 The credit of discovering neutron goes to
A. Rutherford
B. Langmuir
C. Chadwick
D. Austen
7 In the ground state of an atom, the electron is present
A. In the nucleus
B. In the second shell
C. Nearest to the nucleus
D. Farthest from the nucleus
8 Cathode rays drive a small paddle wheel placed in their path. This observation shows that
A. Cathode rays travel in straight lines
B. Cathode rays are negatively charged
C. Cathode rays produce x-rays
D. Cathode rays are material particles having momentum
9 Which of the following is not a property of cathode rays
A. They can produce x-rays when they strike a heavy metal anode
B. They can cause reduction reaction
C. They produce fluorescence in rare earth and minerals
D. They comprise neutral particles
10 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series

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