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

The orbital in Rutherford's model is

Question # 2

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

Question # 3

Neutrons was discovered by

Question # 4

The radius of second Bohr's orbit is

Question # 5

Proton was discovered by:

Question # 6

The value of R (Rydberg's constant) is _______ m-1

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 experimental evidences for the existence of atomic nucleus comes from:

Question # 9

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 15

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

Question # 16

Maximum potential energy that an electron can have within the atom is:

Question # 17

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

Question # 18

The valence orbital configuration of an element with atomic number 23 is

Question # 19

Which of the following is not a sub-atomic particle

Question # 20

1 erg of energy corresponds to

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 25

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

Question # 26

When 6d orbital is complete, the entering electron goes into:

Question # 27

Neutron was discovered by:

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Schrodinger wave equation describes electron completely because
A. It describes a set of four quantum number
B. It describes the particle nature of electron
C. It measures wavelength of electron
D. It describes electron moving in specific orbit
2 When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as
A. Paschen
B. Pfund
C. Balmer
D. Brackett
3 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
A. Voltage is low
B. Discharge tube is not coloured
C. Gas does not conduct current under ordinary pressure
D. Temperature low
4 The total number of orbitals possible for the quantum number n is
A. n
B. n2
C. 2n
D. 2n2
5 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
6 The number of electrons in the M shell of the element with atomic number 24 is
A. 24
B. 12
C. 13
D. 8
7 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
8 A 4f orbital has
A. one node
B. two node
C. three node
D. four nodes
9 Which of the following particles has longest wavelength, if they have same speed:
A. Proton.
B. Neutron.
C. Electron.
D. Positron.
10 When potassium metal is exposed to violet light
A. Ejection of electrons takes place
B. Ejection of some potassium atoms occurs
C. There is no effect
D. The absorption of electrons takes place

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