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

Charge of an electron is:

Question # 2

The orbitals having n + l = 5 are

Question # 3

Charge to mass ratio of electron was discovered by:

Question # 4

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 5

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 6

The orbital in Rutherford's model is

Question # 7

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

Question # 8

The order of distance between the various Bohr orbits is

Question # 9

The e.m value for positive rays maximum for:

Question # 10

The electron in an atom

Question # 11

n + l value for 4f will

Question # 12

The radius of first orbit of H-atom is

Question # 13

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

Question # 14

The credit of discovering neutron goes to

Question # 15

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

Question # 16

The mass of the neutron is of the order of

Question # 17

Neutron was discovered by:

Question # 18

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 19

Charge on electron was discovered by:

Question # 20

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

Question # 21

Neutrons was discovered by

Question # 22

E = hv is the

Question # 23

The nature of the positive rays depend on

Question # 24

The value of charge on electron is

Question # 25

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

Question # 26

The charge over mass ratio of electron is:

Question # 27

The size of electronic shell is described by

Question # 28

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

Question # 29

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

Question # 30

The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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.
2 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
A. 12 and 4
B. 16 and 5
C. 16 and 4
D. 12 and 5
3 Neutrons was discovered by
A. Mosely
B. Milliken
C. Chadwick
D. Ruherford
4 The nature of positive rays depend on:
A. Nature of discharge tube.
B. Nature of resident gas.
C. Nature of electrode.
D. All of above.
5 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N
6 The nature of positive ray depend on:
A. The nature of electrode.
B. The nature of discharge tube.
C. The nature of residual gas.
D. All of above.
7 Splitting of spectral lines when atoms are subjected to strong electric field is called:
A. Zeeman effect.
B. Stark effect
C. Photoelectric effect.
D. Compton effect.
8 The size of electronic shell is described by
A. Azimuthal Q. no
B. Magnetic Q.No
C. Spin Q. No
D. Principle Q. No
9 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:
A. 500 NM.
B. 500 M.
C. 200 NM.
D. 5 x 107m
10 Which of the following is not a sub-atomic particle
A. Electron
B. Proton
C. Neutron
D. Deuteron

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