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

Spectrum of white light is continuous becuase

Question # 2

1 erg of energy corresponds to

Question # 3

n + l value for 4f will

Question # 4

The electron in an atom

Question # 5

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

Question # 6

Subsidiary quantum number specifies

Question # 7

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

Question # 8

The uncertainty principle was stated only

Question # 9

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

Question # 10

The quantum number which determines the shape of the orbital is

Question # 11

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

Question # 12

When potassium metal is exposed to violet light

Question # 13

When the 6d orbital is completed the entering electron goes into

Question # 14

Quantum number value for 2p orbitals are:

Question # 15

Number of neutrons in heavy hydrogen atom is

Question # 16

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

Question # 17

Which of the following orbitals have a dumb bell shape?

Question # 18

Orbital having same energy is called:

Question # 19

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

Question # 20

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 21

Bohr model of atom is contradicted by:

Question # 22

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

Question # 23

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

Question # 24

Charge on electron was discovered by:

Question # 25

Which have better penetrating power

Question # 26

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

Question # 27

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

Question # 28

Cathode rays emitted from cathode are

Question # 29

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

Question # 30

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The wave number of the light emitted by a certain source is 2 x 106m-1. The wavelength of this light will be
A. 500 nm
B. 500 m
C. 200 nm
D. 5 x 107m
2 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
3 The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is
A. Microwave > infrared > visible > ultraviolet
B. Visible > ultraviolet > microwave > infrared
C. Ultraviolet > visible > infrared > microwave
D. Infrared > microwave > ultraviolet > visible
4 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.
5 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
6 The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is
A. 3
B. 4
C. 5
D. 6
7 When electrons revolve in stationary orbits
A. There is no change in energy level
B. They vecome stationary
C. They are gaining kinetic energy
D. There is increase in energy
8 Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called
A. Stark effect
B. Zeeman effect
C. Compton effect
D. Photoelectric effect
9 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
10 The value of R (Rydberg's constant) is _______ m-1
A. 1.0974 x 107
B. 1.0842 x 107
C. 1.082 x 10-7
D. Both a and b

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