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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Which of the following is not charged particle

Question # 7

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

Question # 8

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

Question # 9

When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration

Question # 14

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

Question # 15

The electron in an atom

Question # 16

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

Question # 17

Which is not true with respect to cathode rays?

Question # 18

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

Question # 19

Rutherford's atomic model suggests the existence of

Question # 20

The charge over mass ratio of electron is:

Question # 21

Alpha rays consist of:

Question # 22

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

Question # 23

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

Question # 24

The degenerate orbitals p-sub shell are

Question # 25

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

Question # 26

The nature of positive ray depend on:

Question # 27

Which have better penetrating power

Question # 28

Photons of yellow colour are ______ energetic than violet colour

Question # 29

Quantum number values for 2p orbitals are

Question # 30

Spectrum of white light is continuous becuase

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ECAT Class Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 When cathode rays strike the anode metal X-rays are emitted and not the positive rays because
A. Cathode rays are material particles
B. Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place
C. Cathode rays are absorbed by the nucleus
D. Cathode rays become heated
2 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
3 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
4 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
5 Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as
A. Hund's rule
B. Heisenberg's principle
C. Paulit exclusion principle
D. Auf bau principle
6 Energy of electron in first orbit of H atom is
A. -45.32 KJ/mole
B. -82.08 KJ/mole
C. -52.53 KJ/mole
D. -1313.31 KJ/mole
7 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
8 An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively
A. 3 and 5
B. 3 and 7
C. 3 and 9
D. 2 and 5
9 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.
10 The credit of discovering neutron goes to
A. Rutherford
B. Langmuir
C. Chadwick
D. Austen

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