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

Which of the following is not a property of cathode rays

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

Their e/m, ratio resembles with that of electrons

Question # 4

The charge of an electron is determined by

Question # 5

The e.m value for positive rays maximum for:

Question # 6

Rutherford's model of atom failed because:

Question # 7

The range of visible spectrum is

Question # 8

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

Question # 9

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

Question # 10

Which of the following particles has longest wavelength, if they have same speed:

Question # 11

Orbitals having same energy are called

Question # 12

Splitting of spectral lines when atoms are subjected to strong electric field is called:

Question # 13

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

Question # 14

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

Question # 15

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Question # 16

Energy of electron in the infinite Bohr orbit of H-atom is

Question # 17

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

Question # 18

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

Question # 19

Light emitted from a source has its wave length 500nm, then its wave number will be

Question # 20

Rutherford's experiment led to the discovery of

Question # 21

Pauli's principle is applicable to

Question # 22

The value of Plank's constant 'h' is

Question # 23

The velocity of photon is:

Question # 24

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

Question # 25

When electrons revolve in stationary orbits

Question # 26

Splitting of spectral lines when atoms are subjected to strong electron field is called

Question # 27

The order of distance between the various Bohr orbits is

Question # 28

Cathode rays emitted from cathode are

Question # 29

Quantum number values for 2p orbitals are

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because
A. Cathode rays are small sized particles
B. Cathode rays have same charge
C. Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases
D. Temperature of cathode rays higher
3 Charge to mass ratio (e/m) of the electron is determined by
A. R. A. Millikan
B. J. J. Thompson
C. G. J, Stoney
D. None of these
4 If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be
A. 3 x ao
B. 6 x ao
C. 9 x ao
D. 1/2 x ao
5 In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because
A. The radiations emitted in emission spectrum are absorbed in absorption spectrum
B. Atomic emission spectrum is continuous
C. Atomic absorption spectrum is continuous
D. Distance between the lines increases
6 With increasing principle quantum number, the energy difference between adjacent energy levels in H atom
A. Decreases
B. Increases
C. Remains constant
D. Decreases for low value of Z and increase for higher value of Z
7 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus
8 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
9 When the 6d orbital is completed the entering electron goes into
A. 7f
B. 7 s
C. 7 p
D. 7 d
10 The range of visible spectrum is
A. 300 - 600 nm
B. 600 - 900 nm
C. 400 - 750 nm
D. 100 - 300 nm

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