ECAT Chemistry Chapter 5 Atomic Structure Online Test With Answers

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ECAT Chemistry Chapter 5 Atomic Structure Online Test

Sr. # Questions Answers Choice
1 The experimental evidences for the existence of atomic nucleus comes from: Line spectrum of hydrogen. Magnetic bonding of cathode rays. Millikan oil drop experiment. Scattering of alpha particles by thin metal foil.
2 Anode is the surface on which probability of finding electron is: 50% Less than 10%. More than 95%. Zero.
3 Which one of the following statements is true about discovery of neutrons? These particles were formed by the bombardment of Alpha-particles on Beryllium. These particles are formed by the spiting of alpha-particles. These particles were discovered by natural radioactivity. None of above.
4 With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s: Greater. same. Smaller. Not fixed.
5 Negatively charged particle nature of cathode rays was first demonstrated in 1895 by: Millikan. J. Perrin. Hittrof J.J. Thomson.
6 Which one of the following particles has amass 1/1836 time, that of hydrogen? Neutron. Proton. Electron. Positron.
7 Proton was discovered by: Chadwick J.J. Rhomson Millikan. Goldstein.
8 Charge on electron was discovered by: Millikan. Crook. Neil Bohr. Rutherford.
9 The charge over mass ratio of electron is: <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.6 x 10<sup>-1</sup></span> C Kg<sup>-1</sup><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">9.1 x 10<sup>-31</sup></span> C Kg<sup>-1</sup><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.7588 x 10<sup>11</sup></span> C Kg<sup>-1</sup><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">6.62 x 10<sup>-34</sup></span> C Kg<sup>-1</sup><o:p></o:p></p>
10

Mass of simple electron is:

 <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">9.1 x 10<sup>-31</sup></span> kg<o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">9.1 x 10<sup>-30</sup></span> kg<o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.66 x 10<sup>-31</sup></span> kg<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">9.1 x 10<sup>-31</sup></span> kg<o:p></o:p></p>
11 Charge of an electron is: <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.6 x 10<sup>-19</sup></span> C<o:p></o:p></p> <p class="MsoNormal">9.1 x <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">10<sup>-34</sup></span> C<o:p></o:p></p> <p class="MsoNormal">1.7588 x <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">10<sup>11</sup></span> C<o:p></o:p></p> <p class="MsoNormal">6.62 x <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">10<sup>-34</sup></span> C<o:p></o:p></p>
12 When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of: Alpha rays. Negative particles. Electromagnetic rays. Positive particles.
13 Charge to mass ratio of electron was discovered by: Millika. Rutherford. J.J. Thomson. Chadwick.
14 Alpha rays consist of: Neutrons. Helium nucleus. Protons. Hydrogen nucleus.
15 Maximum potential energy that an electron can have within the atom is: Equal to zero. Less than zero. Greater than zero. Infinite
16 Which of the following particles has longest wavelength, if they have same speed: Proton. Neutron. Electron. Positron.
17 Which of the following was discovered first: Charge to mass ratio of electrons. Mass of electrons. Charge of electrons. All of above at same time.
18 The nature of positive rays depend on: Nature of discharge tube. Nature of resident gas. Nature of electrode. All of above.
19 The e.m value for positive rays maximum for: Oxygen. Nitrogen. Helium. Hydrogen.
20 Neutron was discovered by: Chadwick. Bohr. Rutherford. Plank.
21 When 6d orbital is complete, the entering electron goes into: 7f. 7s. 7p. 7d.
22 Orbital having same energy is called: Hybrid orbital. Valence orbital. Degenerate orbital. D-orbital.
23 Quantum number value for 2p orbitals are: n=2 ,l=1 n=1 ,l=2 n= ,l=0 n=2 ,l=0
24 In the ground state of an atom, the electron is present: In the nucleus. In the second shell. Nearest to the nucleus. farthest from the nucleus.
25 Splitting of spectral lines when atoms are subjected to strong electric field is called: Zeeman effect. Stark effect Photoelectric effect. Compton effect.
26 Bohr model of atom is contradicted by: Planck's quantum theory Pauli's exclusion theory Heisenberg's uncertainty principle. All of above.
27 Rutherford's model of atom failed because: The atom did o have a nucleus and electrons It did not account fro the attraction b/w protons and neutrons It did no account for the stability of the atom. There is actually no space b/w the nucleus ad the electrons.
28 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be: 500 NM. 500 M. 200 NM. 5 x 10<sup>7</sup>m
29 The velocity of photon is: Independent of its wavelength. Depends on its wavelength. Equal to square of its amplitude Depends on its source.
30 The nature of positive ray depend on: The nature of electrode. The nature of discharge tube. The nature of residual gas. All of above.
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